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A wideband, multimode, and monostatic simultaneous transmit and receive (STAR) antenna subsystem is proposed. The configuration is composed of a single four-arm spiral and two analog circuit layers designed to maximize isolation between the transmitting (TX) and receiving (RX) channels. The first layer consists of two Butler matrix beamformer networks (BFNs); one for each TX and RX. The second layer...
A computational model of a wideband μ-coaxial based modified 4×4 Butler matrix feed network for a four-arm spiral antenna is discussed in this paper. Each component within the Butler matrix is fully characterized using the finite element method and their performance is compared with the commercially available counterparts. A method of moments model of a four-arm spiral antenna for 18-40 GHz is also...
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