Abstract
A filter integrated antenna configuration that suppresses the coupling signal from the transmitter (Tx) to receiver (Rx) base station antenna is investigated. We propose an aperture coupled patch antenna with multiple trapezoidal elements installed on the substrate of the Rx antenna between the radiation and feed layers in order to increase the bandwidth in the Rx band while maintaining low mutual coupling in the Tx band. The mutual coupling characteristics and the fractional bandwidth of the Rx antenna are presented as functions of the shape and width of the trapezoidal elements.
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