Compact dual‐mode bandpass filter using defected step‐impedance shunt stub

Abstract

A miniaturized bandpass filter (BPF) using dual-mode defected ground waveguide (DGW) resonator is developed in this letter. The technique with defected step-impedance shunt stub is applied to enhance the self-inductance and self-capacitance of the DGW loop resonator which leads to size reduction. Compared to the conventional design, the central frequency is reduced by 48%. A good agreement between simulation and measurement verifies the validity of this design methodology.

A Novel Triple-Mode Bandpass Filter Using Half-Wavelength-Resonator-Coupled Square-Loop Resonator

“…The concept of microstrip dual-mode bandpass filter was firstly presented in 1972 [1]. Then, several types of dual-mode resonator have been introduced, including square-loop resonator [2], stub-loaded resonator [3] and slotline resonator [4]. Recently, there are several triple-mode resonators reported in the literature to design integrated BPFs [5][6][7][8][9][10][11][12][13][14][15][16].…”