volume | PIER Journals

Abstract

This paper presents a coaxially fed, miniaturized tri-band circularly polarized (CP) antenna with a single layer patch configuration. Broadside radiation is achieved in the L5 band (1.176 GHz), L1 band (1.575 GHz), and S band (2.49 GHz), through the strategic excitation of higher-order modes (TM20 and TM30). The antenna design integrates slots and capacitors to reduce the operating frequency, efficiently excite all three modes, and achieve circular polarization within the designated bands. Each frequency band can be independently tuned with minimal effect on the performance of other bands. Moreover, it also facilitates the tuning of polarization sense (from RHCP to LHCP and vice versa) across all three bands. The proposed antenna radiates RHCP at L5, L1, and S bands, with a gain of 1.3 dBi, 1.5 dBi, and 2.7 dBi, respectively. A prototype with dimensions of (0.15λ_L5 × 0.15λ_L5) has been developed and fabricated to validate the antenna's performance.

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Mr. Gaurav Kumar

Dr. Pratik Mevada

Dr. Ramesh Chandra Gupta

Dr. Vijay Kumar Singh

Dr. Sanjeev Kulshrestha

Dr. Milind Mahajan