A 65.3-73.6 GHz SIW Bandpass Filter in IPD process

This paper presents a miniature substrate integrated waveguide (SIW) bandpass filter which operates from 65.3GHz to 73.6GHz. The coplanar waveguide (CPW) feeding structure is adopted to realize the conversion of Q-TEM mode to TE mode. The complementary split ring resonators (CSRR) is employed to achieve the bandpass characteristics and improve the out-band rejection. The proposed filter is fabricated by using integrated passive device (IPD) process. The measurements results show that the working frequency of the SIW bandpass filter is in the range of 65.3 GHz to 73.6 GHz with an insertion loss of -2.7 dB, a fractional bandwidth (FBW) of 12.0%, and a 3-dB bandwidth of 8.3 GHz and the square of this filter is 1.836mm2.