ADVANCES in NATURAL and APPLIED SCIENCES

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1 ADVANCES in NATURAL and APPLIED SCIENCES ISSN: Published BYAENSI Publication EISSN: May 11(7):pages Open Access Journal Dual Band Circular Monopole Antenna for DCS, WiMAX And LTE 3400 Applications 1 J.Gowshiga Narayani, 2 D.Helena Margaret 1 P.G. student, 2 Assitant ProfessorAlagappa Chettiar college of Engineering and Technology, Karaikudi, Tamil Nadu, India. Received 28 February 2017; Accepted 29 April 2017; Available online 2 May 2017 Address For Correspondence: J. Gowshiga Narayani, P.G. student,assitant Professor Alagappa Chettiar college of Engineering and Technology, Karaikudi, Tamil Nadu, India karthiganarayani9@gmail.com Copyright 2017 by authors and American-Eurasian Network for Scientific Information (AENSI Publication). This work is licensed under the Creative Commons Attribution International License (CC BY). ABSTRACT In this paper a CPW fed circular monopole antenna resonating at two bands is proposed. The heptagonal slot inside the circular patch features L and inverted L planar structures to connect the patch. The dual-band antenna is designed, and its performance is achieved by adjusting the size of curved corners of the triangular patch. Further, the impedance at the resonance frequency is enhanced by implanting a planar structure at the bottom of the circular structure. The designed dual- band antenna resonates at 1.6GHz and 3.8 GHz which is used for DCS, WiMax and LTE 3400 applications. KEYWORDS:CPW fed, DCS, dual band, heptagonal slot, monopole, Wi-Max. INTRODUCTION The ability of integrating more than one communication standard into a single system has become a demand in modern wireless communication device. With the development of adaptive anti jamming antenna in the recent years, the design of miniature antenna elements has received much attention. This indicates that an antenna requires not only providing a dual or multiband operation, but also modest structure, size which is compactable for easy integration with the system. For this, many design configurations are suggested such as dual or multiband planar monopole antenna with Microstrip-line-fed or the probe-fed, planar inverted-f antenna (PIFAs), dielectric resonator antennas and the coplanar waveguide (CPW)-fed antennas. In [1]-[2] the CPW operation was improved by placing a stub. In paper [3], protruding a patch into slot increases impedance bandwidth and axial ratio bandwidth. The parasitic ground branches and the mutual coupling of the antenna elements are optimized to improve the total efficiency is reported in [4]. In [5], two inverted-l branches and a rectangular slot with one circular end were etched on the ground plane to reduce the mutual coupling between two symmetric monopole antennas. The unequal arms and rectangular ring like structure print on a substrate provides the dual-band with a high-gain[6]. Miniature multiband antenna where the pass bands can be controlled independently to achieve good impedance matching is proposed in [7]-[8]. Conventional patch antenna has characteristics of a low profile and a broad impedance bandwidth with slot coupled. In this paper, a dual-band monopole antenna with a circular patch is proposed. The operating bands of the proposed dual-band system covers the DCS ( MHz), 3.5-GHz WiMAX ( MHz) and LTE3400 ( MHz) bands. For better impedance matching and to increase the efficiency, a planar structure is introduced at the bottom of the circular structure. This provides the frequency bands at GHz and GHz. ToCite ThisArticle: J. Gowshiga Narayani, D. Helena Margaret.,Dual Band Circular Monopole Antenna for DCS, WiMAX And LTE 3400 Applications. Advances in Natural and Applied Sciences. 11(7);Pages: 46-51

2 47 J. Gowshiga Narayani, D. Helena Margaret., 2017/Advances in Natural and Applied Sciences. 11(7) May2017, Pages: II. Layout Of The Antenna: Fig.1: Layout of the proposed structure. The proposed antenna structure is schematically shown in Fig.1. The antenna is a circular monopole antenna with a heptagonal shaped slot cut in it. The radius of the circular patch [9] is given by a = F 1 + 2h [ln(πf 1/2 (1) πɛ r F 2h ) ] The slot comprises of L shape arms and inverted L shape arms, in which the two vertical strips are inter connected between the heptagonal slot and arm of the triangular patch. Here FR4 dielectric substrate with a thickness (h) of 1.6 mm and a relative permittivity (ɛ r) of 4.4 is used is used. Efficiency of the antenna can be enhanced by introducing the pair of new T-shape rectangular structures that interconnect arms of the patch with the triangular structure. For the excitation of antenna CPW-feed is used. The parameters of the proposed design are listed in Table 1. Table 1:Dimensions Of The Proposed Antenna Parameter Size (mm) Parameter Size (mm) L 50 W 65 Lp1 25 Wp1 6 Lar1 8.3 War1 5.3 Lar2 6.5 War2 6.5 Ll1 12 Wl1 4.5 Ll2 13 W12,W1 2.5 Ll3 23 Wl Ll4 7.7 Wl4 0.5 Ll Ll Lag 23.5 Wag 7 R 12 g 0.5 III Simulation and Results: The antenna is simulated using HFSS software [9]. Fig.2 shows the return loss of the antenna. The proposed antenna resonates at 1.6GHz and 3.8GHz. Resonance is generated by a pair of long vertical strips get attached to an arms of L and inverted L patch. The corners of the patch are adjusted to obtain the desirable frequency at 1.6GHz. The inverted L shape arm and the gap between the radiating patch and ground plane determines the resonance at the frequency of 3.8GHz. The width of the vertical strip is also adjusted to achieve resonance at the desired frequency bands. VSWR of the antenna is plotted in Fig.3. The planar structure at the edge of the ground plane is adjusted to obtain the minimum value (<2) at the resonance frequency bands. In addition, antenna performance also depends on ground plane size and shape.

3 48 J. Gowshiga Narayani, D. Helena Margaret., 2017/Advances in Natural and Applied Sciences. 11(7) May2017, Pages: A return loss of about dB and dB are observed at 1.6GHz and 3.8GHz respectively. Fig.2:Simulated return loss of the antenna Fig.3:Voltage standing wave ratio of the antenna II. The performance of the proposed antenna is compared to other dual band antenna which is shown in Table Table II: Performance Comparison Of Dual Band Antenna Antenna Overall dimension (mm) [1] [4] Proposed antenna Resonant Frequency (GHz) -10dB Impedance bandwidth (GHz) VSWR (db)

4 49 J. Gowshiga Narayani, D. Helena Margaret., 2017/Advances in Natural and Applied Sciences. 11(7) May2017, Pages: The radiation pattern refers to the directional dependence of the strength of the radio waves. (a) (b) Fig.4: Radiation pattern of the antenna in E-plane and H plane at (a) 1.6GHz,(b) 3.8GHz respectively. The pattern for the two frequency bands is shown in the Fig 4(a) and 4(b), indicating monopole patterns. The surface current distribution of the antenna is shown in the Fig.5(a) and5(b).the current get distributed on the surface of the circular patch at the frequency of 1.6 GHz and 3.8GHz.

5 50 J. Gowshiga Narayani, D. Helena Margaret., 2017/Advances in Natural and Applied Sciences. 11(7) May2017, Pages: (a) (b) Fig. 5: Surface current distribution at (a) 1.6GHz and (b)3.8ghz The overall radiation efficiency of the proposed antenna is %. The peak gain of the proposed monopole antenna is The antenna parameters computed from the simulated result is shown in the Table III. Table III: Antenna Parameters Quantity Value Units Max U W/sr Peak Directivity Peak Gain Peak realized Gain Radiated Power W Accepted Power W Incident Power 1 W Radiation Efficiency Front to Back ratio Decay factor 0

6 51 J. Gowshiga Narayani, D. Helena Margaret., 2017/Advances in Natural and Applied Sciences. 11(7) May2017, Pages: Conclusion: A dual band circular shape antenna is designed, and simulated. It reveals a new method of generating dual frequency by using heptagonal slot and triangular patches in the structure. The CPW feed structure provides better impedance matching. The dual band monopole antenna covers the frequencies from 1.4GHz -1.7GHz centered at 1.6GHz and 3.5GHz 3.9GHz centered at 3.8GHz which can be used for DCS, WiMAX and LTE 3400 applications. Moreover, the advantages of the light and flexible substrate make the dual band antenna structure practicable. REFERENCES 1. Hai-Gao, Xue, Xue-Xia Yang, and Zhewang Ma, A Novel Microstrip-CPW Fed Planar Slot Antenna with Broadband and Circular Polarization IEEE Antennas and Wireless Propagation Letters, Jia-Yi Sze and Shien-Piao Pan, Design of CPW-Fed Circularly Polarized SlotAntenna with a Miniature Configuration, IEEE Antennas and Wireless Propagation Letters, Shui-Wei Zhou, Ping-HuiLi, Yang Wang, Wei-Hua Feng and Zong-QuanLiu, A CPW-Fed Broadband Circularly Polarized Regular-Hexagonal Slot Antenna with L-Shape Monopole, IEEE Antennas and Wireless Propagation Letters, Shang WangandZhengwei Du, A Dual-Antenna System for LTE/WWAN/WLAN/WiMAX Smartphone Applications, IEEE Antennas and Wireless Propagation Letters, 14: Wang,S.and Z.Du, Decoupled dual-antenna system using crossed neutralization lines for LTE/WWAN smartphone applications, IEEEAntennas Wireless Propag. Lett, 14: Mursyidul Idzam Sabran, S.K.A. Rahim, Amuda Yusuf Abdul Rahman, Tharek Abdul Rahman, Muhammad Zaire Muhammad Nor and Evizal, A Dual-Band Diamond-Shaped Antenna for RFID Application, IEEE Antennas and Wireless Propagation Letters, Changjiang Deng, Yue Li, Zhijun Zhang, and Zhenghe Feng, Planar Printed Multi-Resonant Antenna for Octa-Band WWAN/LTE Mobile Handset IEEE Antennas and Wireless Propagation Letters, Haiwen Liu, Pin Wen, Shuangshuang Zhu, Baoping Ren, Xuehui Guan,and Hui Yu, Quad-Band CPW-Fed Monopole Antenna Based on Flexible Pentangle-Loop Radiator IEEE, Antennas and Wireless Propagation Letters, 14: Constantine, A. Balanis, 2007.Antenna Theory Analysis and Design, 2nd Edition, Wiley India(P.) Ltd. 10. Ansoft (HFSS) High frequency structure simulator. Ansys EM 17.2ver.