1. Proposal of a Design Method Based on Circuit Theory for Tunable Filters with Constant Bandwidth;akiyama;IEICE General Conf C-2–29,0
2. Tunable bandpass filters with constant absolute bandwidth;zhang;Proc 9th Int Symp Antennas Propag EM Theory,0
3. A very small dielectric planar filter for portable telephones
4. Stepped Impedance Resonator Based Tunable Combline Bandpass Filter with Wide Tuning Range of Center Frequency by Single DC Power Supply;abe;IEICE Tech Rep CAS2016–88,2017
5. Design and Fabrication of Fourth Fourth-order Tunable Bandpass Filter with Absolute Bandwidth and Transmission Zeros;hashimoto;IEICE Tech Rep,2017