Compact Dual-band Bandpass Filter With Open Stub loaded Resonator Using Substrate Integrated Suspended Line Technology

A dual-band bandpass filter (DBBPF)with open stub-loaded resonator is proposed, which adopts the substrate integrated suspended line (SISL)technology. The designed dual-band bandpass filter realizes two independently controlled passbands, the center frequencies of the two passbands at 1.54 GHz and 7.25 GHz, respectively, and the compact size of only
$0.26\lambda \mathrm{g}\times 0.16\lambda \mathrm{g}$
.