Dual Band Integrated Dielectric Resonator Antenna for S Band and Wi-max Applications
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1 Dual Band Integrated Dielectric Resonator Antenna for S Band and Wi-max Applications Deepika Pathak Research Scholar, Department of Electronics Engineering, Jaipur National University, Jaipur-Agra Bypass, Near New RTO Office, Jagatpura, Jaipur, Rajasthan, India. Orcid: Sudhir Kumar Sharma Professor, Department of Electronics Engineering, Jaipur National University, Jaipur-Agra Bypass, Near New RTO Office, Jagatpura, Jaipur, Rajasthan, India. Orcid: Vivek Singh Kushwah Assistant Professor, Department of Electronics Engineering, Amity School of Engineering & Technology, Maharajpura, Gwalior, Madhya Pradesh, India. Orcid: Abstract This communication inspects a Dual Band integrated Dielectric Resonator Antenna for S band and Wi-max application. The proposed technique is the combination of ring along with reformed polygon shaped slot antenna. Ring DRA is excited by using circular shaped aperture. The simulation process is done with the help of Ansoft HFSS simulation software. The software results show that the proposed radiating structure is operated at two frequencies which cover a frequency band of 2.75GHz to 3.9GHz.The bandwidth of the proposed antenna is 1.21GHz. For these two frequencies 2.9GHz and 3.7GHz, the minimum return loss is - db and-32db respectively. The obtained gain of the antenna at frequency 2.9GHz and 3.7GHz is.9db and 5.dB respectively and directivity of the antenna at frequency 2.9GHz and 3.7GHz is 5.dB and.db respectively. The proposed radiator is applicable for S band application and Wimax applications. Keywords: Dielectric Resonator Antenna, Slot Antenna, Dual band, Reflection coefficient, S Band Applications Wi-max INTRODUCTION Wireless communication system is largely consists of Antennas. For transmitting and receiving EM waves several types of antennas are available. Micro strip antenna and DRA are two different types of antenna widely focused by the antenna researchers. There are many commercial applications such as mobile radio and wireless communication that use microstrip antenna. Microstrip antennas have limitation in size, bandwidth and efficiency. Besides, DRA has its numerous attractive features over microstrip antenna such as high gain, negligible metallic losses, flexible to different excitation arrangements and wider impedance bandwidth [1]. In the incipient stage DRA was introduced in 1983 by, S.A. Long et al. [2]. In open literature, dielectric resonator antennas are accessible in different shapes but three elementary shapes (modal analysis is known) are hemispherical, cylindrical and rectangular. Out of three elementary shapes, cylindrical shape is the most celebrating one because of its compact surface area, diversified far-field pattern and ease of obtainability in commercial market [3]. The typical DR antenna has high radiation efficiency that can be operated at microwave to millimeter wave band communication systems. Dielectric resonator Antenna is commonly used because they are simple to fabricate and gives us wider freedom to regulate the resonant frequency and quality factor. Yet, the high Q factor confined the bandwidth, which controls its utility as an antenna. Dielectric constants and quality factor are two dielectric properties of Dielectric Resonator Antenna. The quality factor is an example of the antenna losses. []. In short time ago integrated DRA have draw large awareness on account of their dual-band and wideband operation even not enlarging antenna size. The integrated design that to be deemed as a union of DRA and one more radiating resonator of the resonant feeding formation. By putting in order the radiating resonators, a small sized dual-band [7] [9] or wideband [1] [1] integrated DRA can be designed. In the proposed work, the cylindrical Ring DRA is excited by an aperture coupled feeding technique. After a brief introduction in section 1, the whole research paper is divided into four sections. In section II discussed about layout and analysis of the proposed antenna. In section III discussed the simulated results of an integrated Ring DRA. Finally this research work has been concluded in section IV
2 S11 International Journal of Applied Engineering Research ISSN Volume 12, Number 2 (217) pp ANTENNA DESIGN AND ANALYSIS Figure 1 indicates the top view and the panoramic view of the integrated Ring DRA. The geometry of the proposed antenna which consists of a polygon antenna and Ring Dielectric Resonator Antenna is demonstrated in figure1. The area of a substrate is 5mm x 5mm, where W s is the width of the substrate and L s is the length of the substrate. The below mentioned specification of utilized FR substrate are 1.mm of thickness, loss tangent of.2 and relative permittivity of.. The area of a ground plane is 5mm x 5mm. The polygon shaped slot antenna is excited by the microstrip feed line of width W f and length L F. Alumina ceramic material is used for transformation of Ring DRA its dielectric permittivity is 9.8 and loss tangent is.2. The annular shape microstrip feeding technique is presented to excite a cylindrical Ring DRA. This antenna gives a bandwidth of below 1dB input reflection coefficient at a center frequency of 2.9GHz and 3.7GHz. Table I: Optimized Dimensions of various parameters of proposed antenna SYMBOLS DIMENSIONS SYMBOLS DIMENSIONS (b) Figure 1: Schematic Diagram of proposed radiator design (a) Feeding Structure (b) Isometric View A. Varying the Height of the DRA From Figure 2 shows the simulated Reflection coefficient of the integrated Dielectric Resonator Antenna, the DRA resonates at 2.9GHz, 3.7 GHz with return loss of -db and - 32dB. The height of the DRA is varied from 9mm to11mm. From Figure 2 it is clear that, the proposed DRA height 11mm gives its best performance. L G=L S 5mm D 22mm W G=W S 5mm D I 9mm L F 2mm H 11mm W F 2.mm H S 1.mm Where, L G and L S is the length of ground plane and substrate, W G and W S is the width of ground plane and substrate L F and W F is the length and width of feed line, H is the height of the Ring DRA, D is the outer diameter of the DRA, D I is the internal diameter of the DRA H9 H1 H11-5 Figure 2: S 11 at various height of DRA B. Varying the Width of the Feed line The width of the feed line is varied from 2.2mm to 2.mm. At width 2.mm the DRA gives its performance. (a) 1399
3 Directivity(dB) Gain(dB) S11 VSWR(abs) International Journal of Applied Engineering Research ISSN Volume 12, Number 2 (217) pp W1 =2.2m m W2 =2.3m m Figure 3: S11 at various width of the feed line Frequency (f) in GHz. Figure 5: Variation of VSWR v/s Frequency SIMULATION RESULTS Parametric analysis of the proposed radiator has been carried out using Ansoft HFSS simulation software. The difference between forward and reflected power in db is defined as the return los of the antenna which is the significant parameter of antenna. -1 db is desirable for the antenna to work efficiently this is the required value of the antenna loss. The software generated outcomes of the S11 parameters is shown in Figure. The frequency of the antenna 2.9GHz and 3.7GHz is and the return loss is -db and -32dB. The efficiency and directional capability of antenna is defined as gain. The gain is the quantity which provides maximum radiation density in overall direction. At these two frequencies the gain of the antenna at 2.9GHz and 3.7GHz is.9db and 5.dB respectively and directivity of the antenna at frequency 2.9GHz and 3.7GHz is 5.dB and.db respectively as shown in Figure (a) and (b) Figure (a): Gain of the integrated Ring DRA Figure : S 11 of the Proposed DRA The value of VSWR lies between 1< VSWR< 2. VSWR should be less than 2 which describes the less reflections of standing waves from the receiver so that maximum power is transmitted to the intended receiver The ratio of the maximum voltage to the minimum voltage in a standing wave pattern is called as voltage standing wave ratio. The value of VSWR can be found at frequency 2.9GHz and 3.7GHz is 1.29 and 1.5 respectively as shown in Figure Frequency (f) in GHz. Figure (b): Directivity of the integrated Ring DRA 13997
4 The simulated far field pattern of the proposed radiator at resonant desired frequencies has shown in Figure 7(a) and 7(b). Figure 7(a): Polar Plot of the Integrated DRA at 2.9 GHz Figure 7(b): Polar Plot of the Integrated DRA at 3.7 GHz CONCLUSION In this paper a Dual band DRA is obtained. The proposed radiator is the combination of ring DRA along with reformed polygon shaped slot antenna. The parametric analysis of proposed DRA with respect to various height of DRA, different width of feed line are carried out and studied. For these two frequencies of 2.9 GHz and 3.7 GHz, the minimum return loss is - db and -32 db respectively. The bandwidth of the antenna is 1.21GHz and the obtained gain of the antenna at frequency 2.9GHz and 3.7GHz is.9db and 5.dB respectively and directivity of the antenna at frequency 2.9GHz and 3.7GHz is 5.dB and.db respectively.. The proposed radiator is applicable for S band application and Wimax applications. REFERENCES [1] Petosa, A., Dielectric Resonator Antenna Handbook Norwood, MA, USA: Artech House, 27. [2] Long, S. A., M.W.McAllister, and L. C.Shen, The resonant dielectric cavity antenna, IEEE Transaction on Antennas and Propagation, Vol.31, No.3, 12, Mar [3] Luk, K.M. and K.W. Leung, Dielectric resonator Antenna, Baldock, Hertfordshire, England: Research Studies Press Ltd., 23. [] Balanis,Constantine A., Antenna Theory: Analysis and Design, A John Wiley & Sons, INC., Publication, 3 rd Edition, 25. [5] M. H. Neshati and Z Wu, Rectangular dielectric resonator antennas: theoretical modeling and experiments, in Proceedings of the 11th International Conference on Antenna and Propagation(ICAP 1), vol. 8, pp , UMIST, Manchester,UK, April 21D. [] Yau and M. V. Shuley, Numerical analysis of an aperture coupled rectangular dielectric resonator antenna using a surface formulation and the method of moments, IEEE proceedings of Microwave & Antenna Propagation, vol. 1, no. 2, pp , [7] Batra, D., Sharma,S., and Kohli, A. K., Dual-Band Dielectric Resonator Antenna for C and X Band Application International Journal of -Antennas and Propagation, Vol. 12, Article ID 9121, 7 pages,212 [8] Halappa Gajera, Debatosh Guha and Chandrakanta Kumar, New Technique of Dielectric Perturbation in Dielectric Resonator Antenna to Control the Higher Mode Leading to Reduced Cross-Polar Radiations, (c) 21. [9] Yao-Dong Zhou and Yong-Chang Jiao, A Novel Single-Fed Wide Dual-Band Circularly Polarized Dielectric Resonator Antenna, IEEE Antennas and Wireless Propagation Letters, Vol. 15, 21. [1] SatishK. Sharma and Manveer K. Brar, Aperture Coupled Pentagon Shaped Dielectric Resonator Antennas Providing Multiband and Wideband Performance, Microwave Opt Technol Lett 395-, 213. [11] Rchair, A.A Kishk &KF.Lee, Wide band stairshaped dielectric resonator antenna, IEE Microw.Antennas Propag.,vol.1,no.2,pp ,Apr,27. [12] Anand Sharma, Gourab Das and Ravi Kumar Gangwar, Dual-band Dual Polarized hybrid aperture-cylindrical dielectric resonator antenna for wireless applications International Journal of RF and Microwave Computer Aided Engineering, DOI: 1.12/mmce
5 [13] Anand Sharma, Ravi Kumar Gangwar, Circularly Polaized hybrid Z-shaped cylindrical dielectric resonator antenna for multi bandapplications IETMicrowaves,Antennas&Propagation,DOI:1.1 9/iet-map.21. [1] Khalily,M.,Kamarudin,M.R.,Mokayef,M.,etal.: omni directional circularly polarized dielectric resonator antenna for 5.5Ghz WLAN -applications,ieee Antennas Wire. Propag.Lett.,pp
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