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Two simple methods for non contact coupling of differential signals to an antenna are presented. In the proximity coupling technique, a differential signal generates voltage maxima on either side of a microstrip gap under an antenna while in the aperture coupling technique, a current maxima is generated and energy is electromagnetically coupled via an aperture under the antenna. Both techniques effectively...
A novel contactless method of spatially coupling differential signals from a transmission line to an antenna structure is described. A differential signal is used to generate a current maximum/virtual short circuit under the antenna and electromagnetic energy is efficiently coupled from the transmission line to the antenna via an aperture. Two different passive microstrip patch antenna designs using...
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