Design and application of D-band bandpass filter based on 0.18 μm complementary metal oxide semiconductor process

This paper designs a bandpass filter for D-band and 0.18 μm complementary metal oxide semiconductor (CMOS) process. The bandpass filter is composed of an inverted L-shaped coupling microstrip line and a cross-coupled resonator, and is coupled to produce two controlled transmission zeros. A defected ground structure is used to make a good impedance match. The designed filter has a 3 dB impedance bandwidth of 52 GHz (149–201 GHz) with a center frequency of 175 GHz and an insertion loss of 3.23 dB. The design of this paper is a CMOS 0.18 μm process capable of applying the D-band bandpass filter with the advantages of lower insertion loss, broadband, and compact size.