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In this contribution we evaluate a direction finding system based on two planar spiral antennas mounted in a squinted fashion and using amplitude information only. This concept avoids hybrids for beam formers or summation networks which makes the antenna elements the only bandwidth-limiting components. With a 10-turn spiral a 1:36 bandwidth and a field of view of 157° is theoretically demonstrated.
In this paper, a quadrifilar spiral antenna (QSA) with an integrated module for UHF radio frequency identification (RFID) reader is presented. The proposed QSA consists of four spiral antennas with short stubs and a microstrip feed network. Also, the shielded module is integrated on the center of the ground inside the proposed QSA. In order to match the proposed QSA with the integrated module, we...
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