Abstract
We present a scalable, dual-band and dual-polarization microstrip antenna designed for the S- and X-bands. The S-band element is a microstrip square annular ring shorted with vias on the inner edge to suppress surface waves. The X-band element is a concentric annular ring slot shorted on the outer edge of the slot. Both elements achieve circular polarization by truncating opposing corners of the two square rings. Both elements utilize two orthogonal feeds to allow either right hand or left hand circular polarization. Our results show performance optimized for the S-band element at 2.95 GHz and 3.5 GHz. We reduce the footprint of the S-band element by loading the outer element using a dielectric with er = 5.0 achieving a 32% reduction in footprint versus a dielectric with er = 2.33. We achieve a peak realized gain to boresight of 3.1 dB.
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