Abstract
An aperture antenna is constructed using a triplate transmission line. The top and bottom conducting plates of the triplate transmission line have circular apertures. The aperture in the bottom plate is backed by a circular cavity of depth D/sub cav/. The radiation characteristics of this antenna are analysed using the finite-difference time-domain method. It is found that the cavity reduces the undesirable parallel-plate mode power remaining in the triplate transmission line. As a result, the radiation efficiency /spl eta//sub rad/ is improved from approximately 54% for D/sub cav/=0 (the case without the cavity) to more than 90% for D/sub cav//spl ges//spl lambda//sub 12.45//4, where where /spl lambda//sub 12.45/ is the wavelength at a test frequency of 12.45 GHz. It is also found that as the cavity depth D/sub cav/ increases, the crosspolarisation component decreases and the gain increases.
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