A reflectionless filtering 90° coupler using stacked cross coupled-line and loaded cross-stub

Marshalling access: four-channel switchable filter bank

High-selectivity bandpass filter with wide upper stopband using harmonic suppression structure

Reconfigurable dual-band filtering power divider with ultra-wide stopband using hybrid microstrip/square defected ground structure

Dual-band bandpass filter with ultra-wide upper stopband using slow-wave dual-resonance cells