Abstract
The aperture coupled microstrip antenna1 has several advantages over transmission line or probe fed patch antennas. Separate substrates can be used for the feed circuit and the antenna element to isolate spurious feed radiation from the antenna element by use of a common ground plane, and to allow more space for the feed network. The input impedance is easily controlled by the size and position of the aperture, and any excess reactance caused by the coupling aperture can be removed through the use of a tuning stub. The aperture coupled configuration also exhibits very low cross-polarization levels, making it well-suited to circularly polarized antenna designs.
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