Dual-Band Dual-Polarized Millimeter-Wave Magneto-Electric Dipole Antenna with Second-Order Bandstop Filtering Characteristic

This paper presents a dual-band differentially fed dual-polarized magnetoelectric (ME) dipole with second-order bandstop filtering, covering bands of 24.25-29.5GHz and 37-40 GHz. To introduce two transmission zeros, hairpin and coupled lambda/4 open-/short-circuited stub resonators are integrated into the ME dipole. This results in a sharp band-edge selectivity without footprint increase. The proposed antenna shows a port-to-port isolation of more than 28.3 dB. The measured results show lower than -24 dB cross-polarization level. The measured peak gains of the single element and 2x2 array are 9.9 dBi and 12.2 dBi, respectively. The array presents a band rejection of 22.5 dB.