A millimeter-wave bandpass filter (BPF) using complementary split-ring resonator (CSRR) loaded quarter mode substrate integrated waveguide (QMSIW) cavities is presented in this work. The CSRR-Ioaded QMSIW cavity resonates below the original QMSIW resonance frequency, which further reduces the size with respect to its SIW counterpart. The reduced quality factor Q of the cavity makes it useful for BPFs with broad fractional bandwidth (FBW). A micromachined 4thorder Chebyshev BPF is demonstrated at the unlicensed 57 GHz to 64 GHz frequency band. A FBW of more than 11.6% with an in-band return loss of better than 15 dB, and an insertion loss of less than 2.5 dB are obtained.Index Terms -Bandpass filter (BPF), complementary split ring resonator (CSRR), quarter-mode substrate integrated waveguide (QMSIW).
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