volume | PIER Journals

Abstract

Modern wireless communication systems require low profile, high gain and wideband antennas. To meet these requirements a low profile Cylindrical Dielectric Resonator Antenna (CDRA) is proposed with wide bandwidth and high gain for ISM and C-Band applications. The CDRA is excited with a 50 ohm microstrip feed line with HEM_12δ, HEM_21δ and HEM_13δ modes being observed at 5.6 GHz, 7.4 GHz and 8.6 GHz resonant frequencies respectively. The perturbation on the basic CDRA leads to the excitation of higher order modes and also decrease the effective permittivity of the CDRA by a factor of 13.4%, thereby reducing the antenna's Q factor, which helps to broaden the antenna's operating frequency range. The proposed structure offers wide impedance bandwidth of 69.4% from 4.8 GHz to 9.9 GHz. A peak gain of 8.9 dBi at 9.4 GHz and 95% radiation efficiency at 5.6 GHz are observed. Additionally, the proposed CDRA has a small footprint of 1.12λ₀ x 1.12λ₀ with a low profile of 0.16λ₀ where λ₀ is the wavelength of the lower cut-off frequency. The proposed antenna is fabricated and measured, and a close agreement is found between the simulated and measured results.

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Dr. Manshree Mishra

Dr. Anil Rajput

Dr. Pramod Kumar Gupta

Dr. Biswajeet Mukherjee