Design of small CRPA arrays with high-dielectric ceramic superstrates for gain enhancement

초록

This paper proposes small CRPA arrays with high-dielectric ceramic superstrates for dual-band operation. Each array element consists of inner and outer microstrip rings printed on a high-dielectric substrate, and a hybrid chip coupler is used for quadrature excitation to achieve circular polarization. The superstrates with high relative permittivity are designed to have a cylindrical shape and are placed above the inner ring area to enhance the bore-sight gain. The results show that the bore-sight gain of the active element pattern is -1.54 dBic at 1.5754 GHz and -3.35 dBic at 1.2276 GHz.

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