volume | PIER Journals

Abstract

A compact size, dual band rectangular spiral antenna with an inset feed is simulated and tested for S-band applications. Feeding of an antenna is given through a 50 Ω microstrip transmission line. The proposed design consists of a rectangular spiral radiating patch in the top plane and a Z-shaped structure in the bottom plane. Ansoft HFSSv13 has been utilised to design the rectangular spiral antenna, and parametric analysis has been done to verify the characteristics of an antenna. The rectangular spiral antenna is fabricated by utilising chemical etching, and it is tested by utilising MS2037C Anritsu combinational analyzer. Reflection coefficients of -16.5 dB and -16.2 dB, and fractional bandwidths of 8% (2.35-2.55 GHz) and 6.7% (3.22-3.44 GHz) are obtained at 2.4 GHz and 3.3 GHz respectively. Maximum gains of 3.1 dBi and 3.34 dBi are obtained at the two resonating frequencies. Omnidirectional and dipole type radiation patterns are obtained for different values of θ and Φ. The rectangular spiral antenna occupies an area of 16 × 16 × 1.6 mm³, and it is fabricated by using FR4 material. Simulated results are in good agreement with the measured ones. These results make the antenna suitable for many Zigbee/IEEE 802.15.4-based wireless data networks that operate in the 2.4-2.4835 GHz band, and it is also suitable for a wide range of applications including FWA systems.

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Dr. Chilakala Lokanath Reddy

Dr. Kallakunta Ravi Kumar

Dr. Nalluri Venkateswarlu

Dr. Kota Mahesh Babu

Dr. Tottempudi Venkata Rama Krishna

Ms. Ambati Navya

Dr. Kantamaneni Srilatha