A stripline hybrid dual‐capacitively loaded SIW resonator and its filter implementation

Abstract

A stripline hybrid dual‐capacitively loaded (DCL) substrate integrated waveguide (SIW) resonator is proposed and analyzed in this letter. First, the fundamental mode (TE101) and two higher order modes (TE102 and TE201) are shifted lower through the capacitive perturbation effect. Extra Striplines are then integrated with the proposed DCL triple‐mode resonator to generate transmission zeros both below and above the passband. Subsequently, the proposed stripline hybrid DCL SIW resonator is used to design an example fourth‐order filter with three transmission zeros. A step‐by‐step design guideline is then summarized under specified filter performance. Finally, to verify the proposed design method, an example fourth‐order bandpass filter at 5.5 GHz with an improved lower rejection band is designed, fabricated, and measured. The measured results indicate that this filter has the advantages of compact size, good selectivity, and easy three‐dimensional integration.

Novel FR4‐based low loss reconfigurable filter with four operating modes using movable transmission lines

“…Bandpass filter plays an important role in wireless communication systems. There are many different technologies to implement bandpass filter, such as microstrip, [1][2][3] stripline, 4 substrate integrated waveguides (SIW), [5][6][7] metal rectangular waveguide, 8,9 substrate-integrated-suspended-line (SISL), [10][11][12] and so on. The reconfigurable technology in the bandpass filter is one of the key research contents.…”