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

Abstract

A tunable dual-mode dual-band square cavity substrate integrated waveguide (SIW) bandpass filter is proposed. Metalized via-holes are inserted into the center of the cavity as perturbations to move and control the four resonant modes to create the dual passband filter. The first passband is formed by the perturbed TE 201 and TE 202 modes, while the second passband is formed by the perturbed TE 301 and TE 302 modes. Moreover, moving the perturbed via-holes on the SIW cavity allows the first passband to be tuned separately while the second passband is almost fixed. A dualband filter prototype with frequencies of 17 GHz and 19.36 GHz and three transmission zeros (TZs) has been designed, fabricated, and measured. The measured and simulated results are in good agreement, confirming the proposed dual-band filter design concept.

A Tunable Dual-mode SIW Cavity Based Bandpass Filter with Wide Upper Stopband Characteristics

“…It can be observed that the proposed filter has better insertion loss compared to the work reported in [9] and [12]. The proposed filter has accomplished better stopband range and better fractional bandwidth compared to the filters presented in [7], [9], [10] and [12]. The filter structure exhibits a compact size compared to the filter reported in [7], [9] and [10].…”

“…The proposed filter has accomplished better stopband range and better fractional bandwidth compared to the filters presented in [7], [9], [10] and [12]. The filter structure exhibits a compact size compared to the filter reported in [7], [9] and [10]. The skirt factor, which is defined as the ratio of the passband's 3 dB bandwidth to its 20 dB bandwidth, is presented in order to explain selectivity.…”

“…A HMSIW doublet was created by employing the rectangular cavity's TE102 and TE301 modes as resonant, and TE101 as a non-resonant mode reported in [9]. Several SIW-based tunable filter has been investigated by various researchers [10][11][12]. A tunable SIW dual mode dual-band filter using perturbing metalized via hole at the middle of the cavity is reported in [10].…”

“…Several SIW-based tunable filter has been investigated by various researchers [10][11][12]. A tunable SIW dual mode dual-band filter using perturbing metalized via hole at the middle of the cavity is reported in [10]. In [11] a constant bandwidth highly selective tunable dual-mode BPF is investigated.…”

Planar substrate integrated waveguide‐based resonators and its usage to compact X‐band small phase noise oscillator

“…22,23 SIW resonators possess more qualityfactor and lower loss in comparison with microstrip resonators. According to, [24][25][26] three X-band SIW resonators are designed, fabricated, and measured. Two of them are conventional (the first one is compact and the second one is uncompacted) and the other one is unconventional.…”