Electronically Tunable Filters
Two- and Four-Pole Tunable 0.7–1.1-GHz Bandpass-to-Bandstop Filters With Bandwidth Control
Tunable Bandpass Filter With Independently Controllable Dual Passbands
Ultra-Wideband Bandpass Filter With Improved Upper Stopband Performance Using Defected Ground Structure
Magnetically Tunable Ferrite Loaded Substrate Integrated Waveguide Cavity Resonator
Novel Compact Tri-Band Bandpass Filter With Controllable Bandwidths