A 3-D Millimeter-Wave Filtering Antenna With High Selectivity and Low Cross-Polarization


A 3-dimensional (three-D) filtering antenna with options of high selectivity and low cross-polarization is proposed and experimentally verified during this communication. Because of the vertically 3-D integration, the high selectivity at either frequency sides of the filtering antenna is achieved by a novel cross-coupling scheme between in-band and out-of-band modes in a very single cavity located within the lower substrate, whereas the low cross-polarization in the way-field is realized because of the symmetric feed and radiators on a cavity-backed dual-slot antenna at the higher substrate. In our style, the cavity-backed dual-slot antenna performs not solely a radiator however conjointly the last resonator of the bandpass filter (BPF). A prototype is demonstrated at Ka-band with a middle frequency of thirty one.495 GHz and fractional bandwidth of 1.fifty sixp.c. Two radiation nulls [transmission zeros (TZs)] at either frequency band edges can be observed and a cross-polarization level not up to is obtained.

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