Compact in-line triplet SIW bandpass filter using etched GCPW line resonator

Abstract

This paper presents a novel compact in-line triplet substrate integrated waveguide (SIW) bandpass filter. The filter is composed of two SIW cavity resonators and an etched one-half wavelength grounded coplanar waveguide (GCPW) line resonator. The GCPW line resonator is etched between two SIW cavity resonators to obtain more compact size. A transmission zero on the upper stopband is created by the cross coupling, which allows the filter implementation in in-line with sharp upper cut-off skirts. Finally, a compact third-order 15 dB return loss filter with a fractional bandwidth (FBW) of 7% at 5.5 GHz is designed, fabricated and measured. The experimental results show good agreement between the simulated and measured results. Keywords: etched GCPW line resonator, in-line, triplet, cross coupling, substrate integrated waveguide (SIW) Classification: Microwave and millimeter wave devices, circuits, and systems References

Multi passband filter with one-twelfth mode miniaturized based on substrate integrated waveguide

“…In recent years, the substrate integrated waveguide (SIW) has attracted people's attention due to its high-quality factor, high-power, low-loss, low-cost, easy fabrication and easy integration with planar integrated circuit [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]. The miniaturization and multi-passband SIW filters have gradually become research hot-spot [21,22,23,24,25,26].…”