Abstract
In this letter, a highly selective narrowband bandpass filter (BPF) is presented in substrate integrated waveguide (SIW) technology. Higher order TE301 resonators are used to utilize their high unloaded Q-factors. A midline feeding scheme together with a bypass coupling provides three transmission zeros (TZs). Two of the zeros can be placed at band edges for high selectivity. A three-pole BPF with 3-dB fractional bandwidth of 1.1% at $f_{\mathrm {\mathbf {0}}} = 8.25$ GHz is fabricated. It provides at least 35-dB attenuation over 2 GHz above and below the passband starting from $f_{0} \pm 0.15$ GHz.
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