Novel High-Selectivity Dual-Band Substrate Integrated Waveguide Filter With Multi-Transmission Zeros

Abstract

Abstract-A novel dual-band filter based on substrate integrated waveguide (SIW) is presented in this paper. The proposed filter is composed of two filters with different center frequencies and bandwidths, where they share input and output ports with source-load coupling using rectangular SIW cavity structure. Multi-transmission zeros have been obtained through electrical coupling between the source and load, which improves the frequency-selective characteristics of the filter greatly. Finally, a Ku-band substrate integrated waveguide dual-band filter with bandwidths of 220 MHz and 120 MHz was finally designed, fabricated, and measured. The measurement results are found to be in good agreement with the simulation results.

A New Tunable Dual-Mode Dual-Band Square Cavity Siw Bandpass Filter

“…Waveguide filters exhibit superior electrical and mechanical properties [1], but their use is restricted by their volume, cost, and planar integration [16][17][18][19]. While microstrip or CPW-based printed planar circuit filters have the advantage of being simple to fabricate, they are also well integrated and small in size [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. However, because of their limited capabilities, they may not be suitable in all situations.…”

“…Dual-band microwave systems, in particular dual-band filters, have grown in popularity in recent years as a result of their ability to operate multiple communication systems simultaneously on different frequency bands. Lowprofile substrate integrated waveguide (SIW) has been extensively used in dual-band band-pass filter (DBBPF) development due to their low loss, simple fabrication, and easy integration with other planar circuits [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”