A Sixth-Order SIW Wideband Filter for 5G Millimeter Wave Application

This paper proposes a sixth-order substrate integrated waveguide (SIW) wideband filter for 5G millimeter wave application. By using a pair of perturbation vias, the traditional single-mode cavity with
$\mathbf{TE}_{102}$
mode has become a dual-mode cavity with
$\mathbf{TE}_{102}$
and
$\mathbf{TE}_{101}$
mode. Two common single-mode cavities and corresponding dual-mode cavities are responsible for the upper and lower half of the passband respectively. Finally, a quasi-elliptic filter having passband frequencies of 24.25-27.5 GHz and a minimum insertion loss of about 1.05 dB is simulated and designed.