Millimeter-Wave Dual-Polarized Filtering Metasurface Antenna for 5G Applications

This manuscript presents a new broadband ±45° dual-polarized filtering metasurface antenna using low-temperature co-fired ceramic (LTCC) process for 5G application. By adopting the four metasurface units excited by a cross-type slot and etching the slot on the metasurface, the antenna can introduce two upper-band-edge radiation nulls to realize a good upper stopband suppression with a high level of 30dB. Meanwhile, four horizontal strips connected with four grounding probes are loaded below the metasurface to produce a lower-band- edge null, achieving the lower stop band. As a result, a good dual-polarized filtering patch antenna is constructed with a wide operating frequency band of 24.6-29.4GHz (18.4%) and good stopband suppression for both two polarizations, as well as high polarization isolation of 25dB. The average in-band gain is about 5.8dB and the average efficiency in the band is over 90%, moreover, the efficiency at upper/lower stopband can be suppressed to be almost less than 5%.