Wideband Bandpass Filter for 5G Millimeter- Wave Application in 45-nm CMOS Silicon-on-Insulator

In this letter, a wideband bandpass filter for 5G application is proposed. The filter is implemented in GF 45-nm CMOS SOI (silicon-on-insulator) and is a 4-pole/ 4-zero design which greatly enhance the filter selectivity and out-of-band rejection. Measurements show a filter 3-dB bandwidth of 22-44 GHz, and covers the millimeter-wave 5G 26/28/39 GHz bands. The minimum insertion loss is 1.5 dB with a return loss better than 10 dB and a filter size of 0.07 mm ² . The work shows that wideband high-performance filter can be integrated as part of the wideband/multiband RF front-end on CMOS SOI.