1 Progress In Electromagnetics Research C, Vol. 33, , 2012 DESIGN OF PLANAR COUPLED-FED MONOPOLE ANTENNA FOR EIGHT-BAND LTE/WWAN MOBILE HANDSET APPLICATION C.-H. Ku 1, H.-W. Liu 2, *, and Y.-X. Ding 1 1 Department of Electrical Engineering, Ming Chi University of Technology, Tai-Shan Dist., New Taipei City 24301, Taiwan 2 Advanced Research Center, Auden Techno Corp., Pa-Te City, Taoyuan Hsien 33463, Taiwan Abstract In this paper, a planar coupled-fed monopole antenna with eight-band LTE/WWAN (LTE700/2300/2500/GSM850/900/1800/1900 /UMTS) operation for mobile handset device application is proposed. It simply consists of a T-shaped driven strip and a coupled radiating structure, which occupy a small PCB area of 50 (L) 15 (W ) mm 2. This antenna, which is printed on a 0.4 mm FR4 substrate and fed by a 50- Ω coaxial cable, can provide two wide operating bandwidths covering MHz and MHz for LTE/WWAN communication systems. A prototype of the proposed antenna is fabricated, tested and analyzed. From the measurement results, nearly omnidirectional coverage and stable gain variation across the desired LTE/WWAN bands can be obtained with the antenna. 1. INTRODUCTION Due to the rapid growth in communication technology, many future portable devices such as smart phone and laptop computer will possess both the WWAN (Wireless Wide Area Network) and the LTE (Long Term Evolution) functions for real-time voice and data transmission. To this end, a multiband antenna design will be a promising technique for those devices. Recently, numerous antenna designs capable of covering not only the GSM850/900/1800/1900/UMTS bands ( / / / / MHz) but also the LTE700/2300/2500 bands ( / / MHz) have been proposed and discussed. Considering the design condition Received 13 August 2012, Accepted 10 October 2012, Scheduled 10 October 2012 * Corresponding author: Hsien-Wen Liu
2 186 Ku, Liu, and Ding in a mobile handset, some antennas with LTE/WWAN operation have attracted very high attention [1 7]. To widen the operating bandwidth, three planar coupled-fed monopole antennas presented in [1 4] were formed with an inductive shorting strip to generate more than three resonant modes. Good multiband property for LTE/WWAN application could be thus obtained with above antenna designs. It was noted that for a smaller mobile handset device, the use of a meander shape was an effective way to reduce the antenna s size. Several internal antennas with a quite compact size were therefore reported in [5 7]. In addition to mobile handset device, many multiband antenna designs [8 13] were suitable to be embedded inside a laptop computer or a tablet computer for LTE/WWAN application. By using a coupled-fed structure to excite the branch radiator, both a looptype antenna  and a shorted monopole antenna  could operate at LTE/WWAN bands for a laptop computer. Moreover, there are three useful methods for further expanding the antenna bandwidth, which are based on printed slot , parallel resonant circuit , and parasitic shorted strip . Above methods all can well assist an internal antenna to attain eight-band feature for laptop computer application. It should be noted that radiation performance is another crucial issue for LTE/WWAN antenna design. A compact multibranch inverted-f antenna , printed on a ceramic substrate with low loss property, may realize good radiation efficiency over the bands of interest. According to those studies shown in [1 13], we clearly know that an internal LTE/WWAN antenna must be designed together with a compact size, multiband operation and good radiation performance for real application. Regarding the LTE/WWAN application in a mobile handset device, a planar coupled-fed eight-band monopole antenna is proposed and studied in this paper. This design is simple and implemented using a low cost FR4 substrate. It has a compact size of 50 (L) 15 (W ) mm 2 and two wide operating bandwidths covering MHz and MHz. By properly forming the coupling structure, the proposed design can well function as an internal antenna for a mobile handset. It is also well-known that this kind of coupling driven-parasitic elements has been found useful for multiband operation with a small size . Details of the antenna design and resonant principle are then described in Section 2. A fabricated prototype of the antenna will be experimentally tested and analyzed in Section 3. Parametric study for further tuning the antenna s property will be performed and discussed as well. Finally, this paper will be concluded with a brief summary in Section 4.
3 Progress In Electromagnetics Research C, Vol. 33, ANTENNA DESIGN Figure 1(a) depicts the whole design structure of the proposed planar coupled-fed eight-band monopole antenna. It is composed of a T- shaped driven strip and a coupled radiating structure, which is (a) (b) Figure 1. Design structure of the proposed coupled-fed eight-band monopole antenna. (a) Antenna geometry, (b) antenna integrated with the ground plane. (L 1 = 6 mm, L 2 = 5.5 mm, L 3 = 3.5 mm, L 4 = 5 mm, L 5 = 1 mm, L 6 = 3 mm, L 7 = 3 mm, L 8 = 15 mm, L 9 = 85 mm, W 1 = 50 mm, W 2 = 29 mm, W 3 = 41.5 mm, W 4 = 20.5 mm, W 5 = 1 mm, W 6 = 0.5 mm and W 7 = 50 mm).
4 188 Ku, Liu, and Ding fabricated on a 0.4-mm-thick FR4 substrate with dielectric constant ε r = 4.4 and loss tangent tan δ = The antenna is fed by a 50 ohm coaxial cable and has a compact size of 50 (L) 15 (W ) mm 2, so that it can be used inside a mobile handset device as an internal antenna. As shown in Figure 1(b), the antenna is placed at the top edge of the ground plane with a suitable size of 100 (L) 50 (W ) mm 2. Such ground plane to model a mobile handset device is reasonable for actual application. In order to have the LTE/WWAN eightband operation, the proposed antenna must be designed with multiple resonant modes. To this end, the antenna utilizes the T-shaped strip to generate 760 MHz mode, and applies the coupled radiating structure to produce 1600 MHz and 2320 MHz modes, respectively. It is noted that the 760 MHz mode can dominate the lower band performance, and the 1600 MHz and 2320 MHz modes can be combined for the upper band operation. Here we employ the full-wave simulator HFSS  to model the antenna configuration and also analyze its surface current. Thus the antenna design can be illustrated clearly. Figure 2(a) shows the current distribution when the antenna is (a) (b) (c) Figure 2. Simulated surface current distributions for the proposed antenna. (a) 2320 MHz, (b) 1600 MHz, (c) 760 MHz.
5 Progress In Electromagnetics Research C, Vol. 33, excited with the frequency of 2320 MHz. It is obvious that strong currents flow along the path A-H (locations are shown in Figure 1(b)), whose length is calculated to be 27 mm and near quarter wavelength of 2320 MHz. This means that the T-shaped strip of the antenna can act as not only a driven strip but also a radiating monopole structure. Figure 2(b) simulates the current trend at 1600 MHz. According to the simulated results, strong and in-phase currents can be generated around the path B-C-G. Note that the path B-C-G is estimated with a length of 47 mm, which also corresponds to quarter wavelength of 1600 MHz. Therefore the path B-C-G is mainly working for the 1600 MHz mode. Moreover, the simulated surface currents at 760 MHz for the antenna are plotted in Figure 2(c), where intense and uniform current distributions can be observed around the path B-C-D-E-F. This is because the path B-C-D-E-F, which has a longest length of 95 mm, is near quarter wavelength of 760 MHz. Three fundamental resonant modes can be thus created with the antenna. Note that good impedance matching across the desired LTE/WWAN bands is also important for the proposed antenna. To successfully produce the lower 760 MHz and 1600 MHz modes, a space between the coupled radiating structure and the T-shaped strip must be carefully evaluated. Then the coupled radiating structure is also connected to the ground plane, where the shorting point B is designed at the left side of the feeding point A. The effect from capacitive coupling can be appropriately Table 1. Size comparison for the proposed antenna with previous planar designs. Reference  Chu and Wong  Lee and Wong  Chen and Wong  Wong and Lin  Hu et al. Proposed design Antenna Size 60 (L) 15 (W ) mm 2 (900 mm 2 ) 40 (L) 12 (W ) mm 2 (480 mm 2 ) 60 (L) 10 (W ) mm 2 (600 mm 2 ) 75 (L) 12 (W ) mm 2 (900 mm 2 ) 96 (L) 11.2 (W ) mm 2 ( mm 2 ) 50 (L) 15 (W ) mm 2 (750 mm 2 ) Size Reduction Ratio (Proposed/Reference) 83.3% 156.3% 125% 83.3% 69.8% NA
6 190 Ku, Liu, and Ding compensated due to above two design considerations. To completely understand the antenna operation, we also utilize the full-wave simulator, SEMCAD , for analyzing the radiation performance and electrical properties of the antenna. The design parameters optimized for the antenna have been eventually determined with L 1 = 6 mm, L 2 = 5.5 mm, L 3 = 3.5 mm, L 4 = 5 mm, L 5 = 1 mm, L 6 = 3 mm, L 7 = 3 mm, L 8 = 15 mm, L 9 = 85 mm, W 1 = 50 mm, W 2 = 29 mm, W 3 = 41.5 mm, W 4 = 20.5 mm, W 5 = 1 mm, W 6 = 0.5 mm and W 7 = 50 mm. Since the proposed antenna is planar, we also compare its size with those prior planar designs published in [1 3, 10] and . Comparison results are given in Table 1. It can be seen that the antenna has a medium size. Thus the proposed coupledfed multiband monopole antenna may be flexibly embedded inside a mobile handset as an internal antenna for LTE/WWAN applications. 3. SIMULATED AND EXPERIMENTAL RESULTS Figure 3 was a fabricated prototype of the proposed planar coupledfed eight-band monopole antenna. The prototype was placed at the top edge of the ground plane and fed by a 50 ohm coaxial cable. The antenna s performance was measured by using the vector network analyzer (Agilent ENA E5071B). The simulated and measured return losses were plotted and compared in Figure 4. It can be observed that the simulated and measured results in the lower band have Figure 3. Fabricated prototype of the proposed antenna. Figure 4. Simulated and measured return losses of the proposed antenna.
7 Progress In Electromagnetics Research C, Vol. 33, good agreement. For the upper band, small discrepancy between the simulations and measurements may be mainly due to the fabrication inaccuracy of the prototype. Note that from the measured results, (a) (b) (c) (d) Figure 5. Parametric analysis for the proposed antenna. (a) Parameter W 1, (b) parameter W 3, (c) parameter L 6, (d) gap, (e) PCB size. (e)
8 192 Ku, Liu, and Ding however, two distinct resonance modes in the upper band can be still found. This also agrees with the design conception. According to 6 db return loss (VSWR 3 : 1), two measured impedance bandwidths of the antenna have been determined to be about MHz and MHz. Thus the desirable eight operating bands, including LTE700/2300/2500 and GSM850/900/1800/1900/UMTS, can be well satisfied with the antenna. To further understand the antenna s operation, several design parameters to tune the antenna performance are also simulated and investigated. Here we utilize the electromagnetic software package SEMCAD to perform the required simulations. First the parameter W 1 of the antenna design is analyzed with various lengths, as shown in Figure 5(a). It is obvious that the bandwidth of the upper band will be reduced when the W 1 is shortened. Although the parameter W 1 is the end of the path B-C-D-E-F for producing the lower band, it can also adjust the upper band performance. From the simulated results, the W 1 = 50 mm is a better choice for our antenna design. Figure 5(b) illustrates the effect from the parameter W 3. It can be seen that as W 3 reduces, both the lower and upper bands will have a narrower bandwidth. This is because the parameter W 3 can dominate the energy coupling intensity from the T-shaped strip to the coupled radiating structure. Note that if W 3 is designed to be 41.5 mm, two wide operating bands can be obtained with the antenna. Therefore the coupling between the driven and parasitic elements plays an important role in determining the bandwidth performance [14, 17]. Figure 5(c) reveals that the antenna performance varies with the parameter L 6. As can be found, while the L 6 = 2 mm is utilized for the antenna, the lower band can achieve a larger bandwidth but the upper band has a smaller one. On the other hand, by utilizing the parameter L 6 = 1 mm, significant bandwidth reduction and enhancement can be seen in the lower and upper bands, respectively. Referring to the simulated results, proper impedance matching for both the lower and upper bands can be achieved as the antenna operates with the parameter L 6 = 3 mm. Moreover, three various gaps between the T- shaped strip and coupled radiating structure are studied in Figure 5(d). It is clear that if the antenna works with the gap = 0.5 mm, the operating bandwidth in the upper band will be reduced obviously. This can be attributed to stronger capacitive coupling. Also, the upper band will shift toward higher frequency when the gap is developed to be about 1.5 mm. Accordingly, better impedance matching can be received as the gap = 1 mm is adopted for the antenna. Moreover, the antenna performance variation against the ground plane size is analyzed in Figure 5(e). It can be observed that when the length of
9 Progress In Electromagnetics Research C, Vol. 33, (a) (b)
10 194 Ku, Liu, and Ding (c) Figure 6. Measured radiation patterns of the proposed antenna. (a) 780 MHz, (b) 1750 MHz, (c) 2320 MHz. the ground plane decreases, bandwidth reduction will be happened in both the lower and upper bands. This would result in the proposed antenna unable to meet multiband operation. Figure 6 illustrates the measured radiation patterns in three typical planes at the frequencies of 780 MHz, 1750 MHz and 2320 MHz for the antenna. For both 780 MHz and 1750 MHz, fairly good omnidirectional pattern and nearly bidirectional pattern can be obtained at the xy-plane and yz-plane, respectively. Referring to the measured results at 2320 MHz, the antenna s patterns in the yz-plane are also close to omnidirectional even though some ripples are included with them. The measured peak gain and antenna efficiency of the proposed design are plotted in Figure 7. Here note that the mismatch loss is included with these measured results. For the lower band, the gain is from 0.95 to 1.62 dbi and the antenna efficiency is around 48 59%, as shown in Figure 7(a). Results in the upper band are given in Figure 7(b), where the gain varies within a range of dbi and the efficiency changes from 51% to 70%. Stable variations for both the gain and efficiency over the desirable LTE/WWAN bands can be
11 Progress In Electromagnetics Research C, Vol. 33, (a) (b) Figure 7. Measured peak gain and antenna efficiency of the proposed antenna. (a) LTE700/GSM850/900 bands, (b) GSM1800/1900/UMTS/LTE2300/2500 bands. Figure 8. SAR simulation model using head/hand tissues provided by SEMCAD. hence obtained with the antenna. This would result in an acceptable performance for the antenna used in a LTE/WWAN mobile handset device. In this work, the SAR (Specific Absorption Rate) results of the antenna are also studied by using the software SEMCAD, where the simulation model is shown in Figure 8. In order to obtain a lower SAR value [18 20], the antenna is positioned at the bottom of the mobile phone. In the figure, the mobile phone is placed with a slant angle of 60, and the distance between the palm center and system ground plane is reasonably chosen to be 30 mm for testing SAR value. The input power to evaluate the SAR is about 24 dbm for the GSM850/900
12 196 Ku, Liu, and Ding Table 2. Simulated 1-g SAR values of the proposed antenna. The return loss shown in the table is the impedance matching level at the testing frequency. Frequency (MHz) head only g SAR head and (W/kg) hand head only Return loss head and (db) hand bands (859 and 925 MHz) and 21 dbm for the GSM1800/1900 bands (1795 and 1920 MHz), UMTS band (2045 MHz), and LTE bands (740, 2350, and 2595 MHz). The simulated SAR values for 1-g head and 1-g head/hand tissues are given in Table 2. The return loss at the testing frequency is indicated as well. Referring to the head only case, the simulated 1-g SAR values across the operating frequencies all satisfy the limit of 1.6 W/kg . When the hand phantom is added for the simulation, the SAR values will increase slightly at 740, 859 and 925 MHz in the lower band. It is also clear that for the upper band, small variations in the SAR values can be seen at frequencies of 1795, 1920 and 2045 MHz. As the testing frequency is set to be 2350 and 2595 MHz, the obtained SAR values are larger than the 1.6 W/kg limit. This is because the hand tissue receives larger power radiated from the antenna. In practical application, the decrease in the SAR values for 1-g head/hand tissue at higher frequencies will be hence required for the proposed antenna. 4. CONCLUSION A planar coupled-fed eight-band monopole antenna for LTE/WWAN operation has been presented and investigated in this paper. It is simple and has a compact size. By properly designing the T-shaped strip and coupled radiating structure, the antenna can provide three resonance modes to achieve good eight-band feature. Several design parameters to adjust the antenna s performance are also analyzed and discussed. Real radiation performance of the antenna is carefully tested and explained as well. The simulated SAR values for the proposed antenna with the head/hand tissues have been also analyzed. Owing to good coverage and stable gain variation, the proposed internal
13 Progress In Electromagnetics Research C, Vol. 33, antenna will be a promising solution for LTE/WWAN mobile handset application. REFERENCES 1. Chu, F. H. and K. L. Wong, Planar printed strip monopole with a closely-coupled parasitic shorted strip for eight-band LTE/GSM/UMTS mobile phone, IEEE Trans. Antennas Propag., Vol. 58, No. 10, , Oct Lee, C. T. and K. L. Wong, Planar monopole with a coupling feed and an inductive shorting strip for LTE/GSM/UMTS operation in the mobile phone, IEEE Trans. Antennas Propag., Vol. 58, No. 7, , Jul Chen, S. C. and K. L. Wong, Wideband monopole antenna coupled with a chip-inductor-loaded shorted strip for LTE/WWAN mobile handset, Microw. Opt. Technol. Lett., Vol. 53, No. 6, , Jun Wong, K. L. and C. T. Lee, Wideband surface-mount chip antenna for eight-band LTE/WWAN slim mobile phone application, Microw. Opt. Technol. Lett., Vol. 52, No. 11, , Nov Chiu, C.-W., C.-H. Chang, and Y.-J. Chi, A meandered loop antenna for LTE/WWAN operations in a smart phone, Progress In Electromagnetics Research C, Vol. 16, , Chen, S. C. and K. L. Wong, Small-size 11-band LTE/WWAN/WLAN internal mobile phone antenna, Microw. Opt. Technol. Lett., Vol. 52, No. 11, , Nov Wong, K. L., M. F. Tu, C. Y. Wu, and W. Y. Li, On-board 7-band WWAN/LTE antenna with small size and compact integration with nearby ground plane in the mobile phone, Microw. Opt. Technol. Lett., Vol. 52, No. 12, , Dec Wong, K. L. and P. J. Ma, Coupled-fed loop antenna with branch radiators for internal LTE/WWAN laptop computer antenna, Microw. Opt. Technol. Lett., Vol. 52, No. 12, , Dec Kang, T. W., K. L. Wong, L. C. Chou, and M. R. Hsu, Coupledfed shorted monopole with a radiating feed structure for eightband LTE/WWAN operation in the laptop computer, IEEE Trans. Antennas Propag., Vol. 59, No. 2, , Feb Wong, K. L. and W. J. Lin, WWAN/LTE printed slot antenna for tablet computer application, Microw. Opt. Technol. Lett., Vol. 54, No. 1, 44 49, Jan
14 198 Ku, Liu, and Ding 11. Wong, K. L., Y. C. Liu, and L. C. Chou, Bandwidth enhancement of WWAN/LTE tablet computer antenna using embedded parallel resonant circuit, Microw. Opt. Technol. Lett., Vol. 54, No. 2, , Feb Kang, T. W. and K. L. Wong, Simple two-strip monopole with a parasitic shorted strip for internal eight-band LTE/WWAN laptop computer antenna, Microw. Opt. Technol. Lett., Vol. 53, No. 4, , Apr Hu, C. L., D. L. Huang, H. L. Kuo, C. F. Yang, C. L. Liao, and S. T. Lin, Compact multibranch Inverted-F antenna to be embedded in a laptop computer for LTE/WWAN/IMT-E applications, IEEE Antennas Wireless Propag. Lett., Vol. 9, , Risco, S., J. Anguera, A. Andújar, A. Pérez, and C. Puente, Coupled monopole antenna design for multiband handset devices, Microw. Opt. Technol. Lett., Vol. 52, No. 10, , Feb Ansoft Corporation HFSS [Online]. Available: SEMCAD, Schmid & Partner Engineering AG (SPEAG) [Online]. Available: Anguera, J., C. Puente, C. Borja, G. Font, and J. Soler A systematic method to design single-patch broadband microstrip patch antennas, Microw. Opt. Technol. Lett., Vol. 31, No. 3, , Nov Li, C. H., E. Ofli, N. Chavannes, and N. Kuster, Effects of hand phantom on mobile phone antenna performance, IEEE Trans. Antennas Propag., Vol. 57, , Hsu, M. R. and K. L. Wong, Seven-band folded-loop chip antenna for WWAN/WLAN/WiMAX operation in the mobile phone, Microw. Opt. Technol. Lett., Vol. 51, , Lee, C. T. and K. L. Wong, Internal WWAN clamshell mobile phone antenna using a current trap for reduced groundplane effects, IEEE Trans. Antennas Propag., Vol. 57, , American National Standards Institute (ANSI), Safety levels with respect to human exposure to radio-frequency electromagnetic field, 3 khz to 300 GHz, ANSI/IEEE Standard C95.1, Apr
Progress In Electromagnetics Research C, Vol. 42, 19 124, 213 A NOVEL DESIGN OF LTE SMART MOBILE ANTENNA WITH MULTIBAND OPERATION Sheng-Ming Deng 1, *, Ching-Long Tsai 1, Jiun-Peng Gu 2, Kwong-Kau Tiong
J. of Electromagn. Waves and Appl., Vol. 26, x y, 2012 COMPACT COUPLED-FED WIDEBAND ANTENNA FOR INTERNAL EIGHT-BAND LTE/WWAN TABLET COMPUTER APPLICATIONS Y.-L. Ban 1, *, S.-C. Sun 1, J. L.-W. Li 1, and
Compact Triple-Band Monopole Antenna for WLAN/WiMAX-Band USB Dongle Applications Ya Wei Shi, Ling Xiong, and Meng Gang Chen A miniaturized triple-band antenna suitable for wireless USB dongle applications
Progress In Electromagnetics Research Letters, Vol. 23, 147 155, 2011 A COMPACT MULTIBAND MONOPOLE ANTENNA FOR WLAN/WIMAX APPLICATIONS Z.-N. Song, Y. Ding, and K. Huang National Key Laboratory of Antennas
IOSR Journal of Electronics and Communication Engineering (IOSR-JECE) e-issn: 2278-2834,p- ISSN: 2278-8735. PP 44-48 www.iosrjournals.org Design of Compact Multiband Antenna for Wwan/Lte Mobile Phone Applications
Progress In Electromagnetics Research M, Vol. 60, 197 207, 2017 Antenna with Two Folded Strips Coupled to a T-Shaped Monopole The-Nan Chang * and Yi-Lin Chan Abstract An antenna designated mainly for cellular
INTERNAL EIGHT-BAND WWAN/LTE HANDSET ANTENNA USING LOOP SHORTING STRIP AND CHIP- CAPACITOR-LOADED FEEDING STRIP FOR BANDWIDTH ENHANCEMENT Kin-Lu Wong and Yu-Wei Chang Department of Electrical Engineering,
SMALL-SIZE MICROSTRIP-COUPLED PRINTED PIFA FOR 2.4/5.2/5.8 GHz WLAN OPERATION IN THE LAPTOP COMPUTER Kin-Lu Wong and Wei-Ji Chen Department of Electrical Engineering, National Sun Yat-Sen University, Kaohsiung
Title A folded loop antenna with four resonant modes Author(s) Wu, D; Cheung, SW; Yuk, TI Citation The 9th European Conference on Antennas and Propagation (EuCAP 2015), Lisbon, Portugal, 13-17 April 2015.
Machine Copy for Proofreading, Vol. x, y z, 2016 A CPW-fed Microstrip Fork-shaped Antenna with Dual-band Circular Polarization Chien-Jen Wang and Yu-Wei Cheng * Abstract This paper presents a microstrip
Progress In Electromagnetics Research Letters, Vol. 50, 55 60, 2014 A Multiband Four-Antenna System for the Mobile Phones Applications Jingli Guo 1, *,BinChen 1, Youhuo Huang 1, and Hongwei Yuan 2 Abstract
Progress In Electromagnetics Research Letters, Vol. 15, 107 116, 2010 COMPACT TRIPLE-BAND MONOPOLE ANTENNA WITH C-SHAPED AND S-SHAPED MEANDER STRIPS FOR WLAN/WIMAX APPLICATIONS F. Li, L.-S. Ren, G. Zhao,
Progress In Electromagnetics Research Letters, Vol. 55, 1 6, 2015 Compact Triple-Band Monopole Antenna with Inverted-L Slots and SRR for WLAN/WiMAX Applications Yuan Xu *, Cilei Zhang, Yingzeng Yin, and
This article has been accepted and published on J-STAGE in advance of copyediting. Content is final as presented. IEICE Electronics Express, Vol.*, No.*, 1 10 A compact planar ultra-wideband handset antenna
Progress In Electromagnetics Research Letters, Vol. 17, 67 74, 2010 A MINIATURIZED INTERNAL WIDEBAND ANTENNA FOR WIRELESS USB DONGLE APPLICATION J.-G. Gong, Y.-C. Jiao, Q. Li, J. Wang, and G. Zhao National
7. C. Tang, J. Lu, and K. Wong, Circularly polarized equilateral-triangular microstrip antenna with truncated tip, Electron Lett 34 (1998), 1277 1278. 8. F. Declercq, I. Couckuyt, H. Rogier, and T. Dhaene,
Progress In Electromagnetics Research Letters, Vol. 13, 75 81, 2010 DESIGN OF A NOVEL MICROSTRIP-FED DUAL-BAND SLOT ANTENNA FOR WLAN APPLICATIONS S. Gai, Y.-C. Jiao, Y.-B. Yang, C.-Y. Li, and J.-G. Gong
Progress In Electromagnetics Research C, Vol. 57, 149 158, 215 Thin Profile Wideband Printed Monopole Antenna for Slim Mobile Handsets Applications Pradutt K. Bharti, Hari S. Singh, Gaurav K. Pandey, and
Progress In Electromagnetics Research Letters, Vol. 17, 115 123, 2010 A COMPACT DUAL INVERTED C-SHAPED SLOTS ANTENNA FOR WLAN APPLICATIONS D. Xi, L. H. Wen, Y. Z. Yin, Z. Zhang, and Y. N. Mo National Laboratory
Progress In Electromagnetics Research Letters, Vol. 7, 39 44, 217 A Coupled-Fed Reconfigurable Antenna for Internal LTE Mobile Phone Applications Xinxing Zhong * Abstract In this paper, a multi-frequency
Antennas and Propagation Volume 215, Article ID 217241, 6 pages http://dx.doi.org/1.1155/215/217241 Research Article A Compact Experimental Planar Antenna with a USB Connector for Mobile Phone Application
Progress In Electromagnetics Research C, Vol. 23, 265 275, 2011 DESIGN OF TRI-BAND PRINTED MONOPOLE ANTENNA FOR WLAN AND WIMAX APPLICATIONS J. Chen *, S. T. Fan, W. Hu, and C. H. Liang Key Laboratory of
Sensors and Materials, Vol. 29, No. 4 (2017) 491 496 MYU Tokyo 491 S & M 1342 Wideband Coupled Loop Antenna for Laptop PC Sensor Network Applications Chien-Min Cheng, Shih-Hsien Tseng, and Wen-Shan Chen
324 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 57, NO. 2, FEBRUARY 2009 Multiband Printed Monopole Slot Antenna for WWAN Operation in the Laptop Computer Kin-Lu Wong, Fellow, IEEE, and Li-Chun
Progress In Electromagnetics Research C, Vol. 45, 1 13, 2013 BROADBAND SERIES-FED DIPOLE PAIR ANTENNA WITH PARASITIC STRIP PAIR DIRECTOR Junho Yeo 1, Jong-Ig Lee 2, *, and Jin-Taek Park 3 1 School of Computer
Progress In Electromagnetics Research C, Vol. 40, 1 13, 2013 COMPACT MULTIBAND FOLDED IFA FOR MOBILE APPLICATION Shuxi Gong *, Pei Duan, Pengfei Zhang, Fuwei Wang, Qiaonan Qiu, and Qian Liu National Laboratory
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 57, NO. 5, MAY 2009 1373 Printed =8-PIFA for Penta-Band WWAN Operation in the Mobile Phone Chih-Hua Chang, Student Member, IEEE, and Kin-Lu Wong, Fellow,
Progress In Electromagnetics Research C, Vol. 10, 63 73, 2009 INTERNAL SHORTED PATCH ANTENNA INTEGRATED WITH A SHIELDING METAL CASE FOR UMTS OPER- ATION IN A PDA PHONE Y.-T. Liu Department of Physics R.O.C.
Progress In Electromagnetics Research, PIER 84, 333 348, 28 A CIRCULARLY POLARIZED QUASI-LOOP ANTENNA C.-J. Wang and C.-H. Lin Department of Electronics Engineering National University of Tainan Tainan
International Journal of Wireless Communications and Mobile Computing 2017; 5(2): 6-14 http://www.sciencepublishinggroup.com/j/wcmc doi: 10.11648/j.wcmc.20170502.11 ISSN: 2330-1007 (Print); ISSN: 2330-1015
Chapter 7 Design of the UWB Fractal Antenna 7.1 Introduction F ractal antennas are recognized as a good option to obtain miniaturization and multiband characteristics. These characteristics are achieved
Antennas and Propagation Volume 21, Article ID 63674, 9 pages http://dx.doi.org/1.11/21/63674 Research Article Small-Size Seven-Band WWAN/LTE Antenna with Distributed LC Resonant Circuit for Smartphone
Progress In Electromagnetics Research Letters, Vol. 21, 11 18, 2011 DUAL-WIDEBAND MONOPOLE LOADED WITH SPLIT RING FOR WLAN APPLICATION W.-J. Wu, Y.-Z. Yin, S.-L. Zuo, Z.-Y. Zhang, and W. Hu National Key
Antennas and Propagation, Article ID 19579, pages http://dx.doi.org/1.1155/21/19579 Research Article Compact Dual-Band Dipole Antenna with Asymmetric Arms for WLAN Applications Chung-Hsiu Chiu, 1 Chun-Cheng
Progress In Electromagnetics Research Letters, Vol. 75, 13 18, 2018 Miniature Multiband Antenna for WLAN and X-Band Satellite Communication Applications Ruixing Zhi, Mengqi Han, Jing Bai, Wenying Wu, and
Progress In Electromagnetics Research C, Vol. 13, 149 158, 2010 SMALL SEMI-CIRCLE-LIKE SLOT ANTENNA FOR ULTRA-WIDEBAND APPLICATIONS F. Amini and M. N. Azarmanesh Microelectronics Research Laboratory Urmia
Progress In Electromagnetics Research Letters, Vol. 6, 99 16, 29 BIDIRECTIONAL HIGH GAIN ANTENNA FOR WLAN APPLICATIONS X. Li, L. Yang, S.-X. Gong, and Y.-J. Yang National Key Laboratory of Antennas and
Research Inventy: International Journal Of Engineering And Science Vol.3, Issue 1 (May 2013), PP 12-19 Issn(e): 2278-4721, Issn(p):2319-6483, Www.Researchinventy.Com Design of E-Shape Fractal Simple Multiband
Progress In Electromagnetics Research Letters, Vol. 63, 45 51, 2016 A Simple Dual-Wideband Magneto-Electric Dipole Directional Antenna Lei Yang *,Zi-BinWeng,andXinshuaiLuo Abstract A simple dual-wideband
Progress In Electromagnetics Research C, Vol. 54, 95 101, 2014 A Broadband Omnidirectional Antenna Array for Base Station Bo Wang 1, *, Fushun Zhang 1,LiJiang 1, Qichang Li 2, and Jian Ren 1 Abstract A
VC 4. L.-H. Hsieh and K. Chang, High-efficiency piezoelectric-transducer tuned feedback microstrip ring-resonator oscillators operating at high resonant frequencies, IEEE Trans Microwave Theory Tech 51
Sensors and Materials, Vol. 29, No. 4 (2017) 483 490 MYU Tokyo 483 S & M 1341 Multiband USB Antenna for Connecting Sensor Network and Internet Wen-Shan Chen, Chien-Min Cheng, * Yu-Liang Wang, and Guan-Quan
Proceedings of the 2 nd World Congress on Electrical Engineering and Computer Systems and Science (EECSS'16) Budapest, Hungary August 16 17, 2016 Paper No. EEE 140 DOI: 10.11159/eee16.140 A Dual-Band MIMO
Progress In Electromagnetics Research Letters, Vol. 61, 131 137, 2016 A Wideband Dual-polarized Modified Bowtie Antenna for 2G/3G/LTE Base-station Applications Zhao Yang *, Cilei Zhang, Yingzeng Yin, and
Journal of Engineering Science and Technology Vol. 11, No. 2 (2016) 267-277 School of Engineering, Taylor s University CIRCULARLY POLARIZED SLOTTED APERTURE ANTENNA WITH COPLANAR WAVEGUIDE FED FOR BROADBAND
Antennas and Propagation Volume 216, Article ID 3976936, 8 pages http://dx.doi.org/1.1155/216/3976936 Research Article Compact Antenna with Frequency Reconfigurability for GPS/LTE/WWAN Mobile Handset Applications
CHAPTER 4 DESIGN OF BROADBAND MICROSTRIP ANTENNA USING PARASITIC STRIPS WITH BAND-NOTCH CHARACTERISTIC 4.1 INTRODUCTION Wireless communication technology has been developed very fast in the last few years.
Design of A PIFA Antenna with Slots on Ground to Improve Bandwidth Anoop Varghese 1, Kazi Aslam 2 Dept. of Electronics & Telecommunication Engineering, AISSMS COE, Pune, India 1 Assistant Professor, Dept.
Rev. Roum. Sci. Techn. Électrotechn. et Énerg. Vol. 63, 3, pp. 283 288, Bucarest, 2018 Électronique et transmission de l information DUAL BAND MONOPOLE ANTENNA FOR WLAN/WIMAX APPLICATIONS BIPLAB BAG 1,
J. of Electromagn. Waves and Appl., Vol. 2, No. 8, 993 16, 26 ENHANCEMENT OF PRINTED DIPOLE ANTENNAS CHARACTERISTICS USING SEMI-EBG GROUND PLANE F. Yang, V. Demir, D. A. Elsherbeni, and A. Z. Elsherbeni
Progress In Electromagnetics Research Letters, Vol. 65, 95 102, 2017 A Compact Wideband Circularly Polarized L-Slot Antenna Edge-Fed by a Microstrip Feedline for C-Band Applications Mubarak S. Ellis, Jerry
ITB J. ICT, Vol. 4, No. 2, 2010, 67-78 67 A 2.3/3.3 GHz Dual Band Antenna Design for WiMax Applications Adit Kurniawan, Iskandar & P.H. Mukti School of Electrical Engineering and Informatics, Bandung Institute
Progress In Electromagnetics Research Letters, Vol. 24, 139 147, 211 MINIATURIZED MODIFIED DIPOLES ANTENNA FOR WLAN APPLICATIONS Y. Y. Guo 1, *, X. M. Zhang 1, G. L. Ning 1, D. Zhao 1, X. W. Dai 2, and
LETTER IEICE Electronics Express, Vol.10, No.17, 1 6 Compact UWB antenna with dual band-notches for WLAN and WiMAX applications Hao Liu a), Ziqiang Xu, Bo Wu, and Jiaxuan Liao Research Institute of Electronic
Progress In Electromagnetics Research Letters, Vol. 26, 39 48, 2011 PRINTED BLUETOOTH AND UWB ANTENNA WITH DUAL BAND-NOTCHED FUNCTIONS F.-C. Ren *, F.-S. Zhang, J.-H. Bao, Y.-C. Jiao, and L. Zhou National
Title Low-profile microstrip antenna with bandwidth enhancement for radio frequency identification applications Author(s) Yang, P; He, S; Li, Y; Jiang, L Citation Electromagnetics, 2012, v. 32 n. 4, p.
Title Low-profile microstrip antenna with bandwidth enhancement for radio frequency identification applications Author(s) Yang, P; He, S; Li, Y; Jiang, L Citation Electromagnetics, 2012, v. 32 n. 4, p.
Progress In Electromagnetics Research M, Vol. 59, 45 54, 2017 Wide Slot Antenna with Y Shape Tuning Element for Wireless Applications Bhupendra K. Shukla *, Nitesh Kashyap, and Rajendra K. Baghel Abstract
Progress In Electromagnetics Research C, Vol. 49, 133 139, 2014 A Compact Dual Band-Notched Ultrawideband Antenna with λ/4 Stub and Open Slots Jian Ren * and Yingzeng Yin Abstract A novel compact UWB antenna
Progress In Electromagnetics Research Letters, Vol. 67, 97 102, 2017 Compact and Low Profile MIMO Antenna for Dual-WLAN-Band Access Points Xinyao Luo *, Jiade Yuan, and Kan Chen Abstract A compact directional
Progress In Electromagnetics Research Letters, Vol. 44, 81 86, 2014 Design of a Compact and High Selectivity Tri-Band Bandpass Filter Using Asymmetric Stepped-impedance Resonators (SIRs) Jun Li *, Shan
Progress In Electromagnetics Research, Vol. 19, 1 16, 21 A COMPACT PLANAR MULTIBAND ANTENNA FOR INTEGRATED MOBILE DEVICES W.-J. Liao, S.-H. Chang, and L.-K. Li Department of Electrical Engineering National
Antenna Theory and Design Antenna Theory and Design Associate Professor: WANG Junjun 王珺珺 School of Electronic and Information Engineering, Beihang University F1025, New Main Building email@example.com
Progress In Electromagnetics Research Letters, Vol. 74, 9 16, 2018 A Compact Broadband Printed Circular Slot Antenna with Stair Shaped Ground Plane Baudha Sudeep 1, * and Kumar V. Dinesh 2 Abstract This
IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY COMPACT ULTRA WIDE BAND ANTENNA WITH BAND NOTCHED CHARACTERISTICS. Raksha Sherke *, Ms. Prachi C. Kamble, Dr. Lakshmappa K Ragha
44 Broadband Designs of a Triangular Microstrip Antenna with a Capacitive Feed Mukesh R. Solanki, Usha Kiran K., and K. J. Vinoy * Microwave Laboratory, ECE Dept., Indian Institute of Science, Bangalore,
Performance analysis of Meandered loop and Top loaded monopole antenna for Wireless Applications M. Ilakkia¹, T. Anita Jones Mary², Dr. C. S. Ravichandran³, Abstract This paper presents the design of multiple
A Compact Multiband Antenna for GSM and WiMAX Applications M. Ali Babar Abbasi, M. Rizwan, Saleem Shahid, Sabaina Rafique, Haroon Tariq Awan, S. Muzahir Abbas Department of Electrical Engineering, COMSATS
Progress In Electromagnetics Research C, Vol. 66, 183 190, 2016 A Pattern Reconfigurable Antenna for WLAN and WiMAX Systems Santasri Koley, Lakhindar Murmu, and Biswajit Pal Abstract A novel tri-band pattern
Progress In Electromagnetics Research Letters, Vol. 55, 7, 5 Design of a Wideband Sleeve Antenna with Symmetrical Ridges Peng Huang *, Qi Guo, Zhi-Ya Zhang, Yang Li, and Guang Fu Abstract In this letter,
Global Journal of Researches in Engineering: F Electrical and Electronics Engineering Volume 15 Issue 3 Version 1. Type: Double Blind Peer Reviewed International Research Journal Publisher: Global Journals
Progress In Electromagnetics Research C, Vol. 51, 121 129, 2014 Fractal-Based Triangular Slot Antennas with Broadband Circular Polarization for RFID Readers Jianjun Wu *, Xueshi Ren, Zhaoxing Li, and Yingzeng
A Design of Multiband Antenna using Main Radiator and Additional Sub-Patches for Different Wireless Communication Systems 1 Dhanalakshmi.N, 2 Atchaya.S, 3 Veeramani.R 1,2,3 K.S.R College of Engineering
REFERENCES 1. G.A. Lindberg, A shallow-cavity UHF crossed-slot antenna, IEEE Trans Antenna Propag 17 (1969), 558 563. 2. G.H. Brown, The turnstile antenna, Electronics (1936), p. 15. 3. H. Kawakami, G.