Design of small CRPA arrays with circular loop antennas for frequency-insensitive properties

초록

This paper proposes a small CRPA array with frequency-insensitive properties. The array consists of seven elements, and each element is composed of upper and lower circular loops that are designed to resonate at 1.575 GHz and 1.227 GHz, respectively. The lower loop is fed by the hybrid chip coupler, and the upper loop is electromagnetically coupled for a frequency-insensitive feeding mechanism. Due to the frequency insensitive behavior, the bore-sight gain of each array element is maintained to be greater than 5 dBic from 1.21 GHz to 1.74 GHz, and this bandwidth can be further extended by adjusting the width of the upper circular loop, which varies the ratio of electric and magnetic coupling strengths in the proposed feeding mechanism.

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