Post-Tuned Microstrip Antennas for Frequency-Agile and Polarization-Diverse Applications

摘要

A technique is investigated for controlling the operating frequency and polarization of microstrip antennas. The control is achieved by the placement of shorting posts at appropriate locations within the antenna's boundaries. By changing the number and locations of the posts, the operating frequency can be tuned over a 1.5-to-1 range, and the polarization can be changed from horizontal to vertical, right-hand circular, or left-hand circular. All these changes are obtained without significantly altering the input impedance or radiation patterns of the antenna and without increasing the complexity of the external microwave feed network. Also, the frequency and polarization can be electronically controlled by the use of microwave switching diodes for the shorting posts. Antennas that have two feeds and operate simultaneously in two orthogonal polarizations have been constructed with the capability to switch between linear and circular polarizations. Also, a thin, frequency-scanned array has been built with the frequency-agile microstrip elements. (Author)