A compact bandpass SIW filter with transmission zero at lower frequency side

Cao, Lewei; Qiu, Shujie; Xu, Feng; Pu, Jingjing

doi:10.1109/icuwb.2016.7790552

Cited by 2 publications

(3 citation statements)

References 7 publications

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“…The filter with a centre frequency of 10.75 GHz and a bandwidth of 550 MHz is designed. The in-band return loss is larger than 20 dB, and two TZs are observed at The initial size of the isosceles right triangular SIW cavities can be determined by (13) and (14). The unloaded Q factor is about 500.…”

Section: Filter Designmentioning

confidence: 99%

“…Compared with rectangular and circular SIW cavities, triangular SIW cavities not only maintain the similar properties of the rectangular cavities at a fixed resonant frequency, but also have the advantage of more compact size [10]. Some filters based on the triangular SIW cavities have been reported [11][12][13][14][15]. In [11], some compact BPFs with equilateral triangular SIW cavities are proposed, but it has a poor performance.…”

Section: Introductionmentioning

confidence: 99%

“…Introducing TZs to filter design can improve the frequency selectivity and the out-of-band performance. Therefore, to obtain TZs, examples of such efforts include using the cross-coupling between non-adjacent triangular SIW cavities [12][13][14]. Among these, only one TZ is observed at the lower or upper side of the passband.…”

Section: Introductionmentioning

confidence: 99%

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Compact cross‐coupled filters based on isosceles right triangular and equilateral triangular SIW cavities

Deng

Chu

et al. 2019

IET Microwaves, Antennas & Propagation

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Two kinds of classical triangular metric resonant cavities including the isosceles right triangular and equilateral triangular metric cavities are investigated carefully. A comprehensive and rigorous derivation process of these two resonant cavities is proposed. Based on this, the mode function and the transverse field components for the modes in the triangular substrate‐integrated waveguide (SIW) cavities can be provided. Then the resonant frequency of both kinds of triangular SIW cavities can be calculated. Combined it with the coupling matrix, a fourth‐degree filter implemented of isosceles right triangular SIW cavities and a sixth‐degree filter formed by equilateral triangular SIW cavities are designed, fabricated and measured in detail. The measured results are in line with the simulated ones. The frequency responses of both filters show a pair of transmission zeroes at each side of the pass band due to the cross‐coupling structure. It also verifies the validity of the derivation in this study. Compared with the rectangular and circular resonant ones, the construct of the triangular cavity has the advantage of much more compact. Besides, the proposed filters based on the triangular cavity also have their own advantages of low cost, good selectivity and easy integration with other planar circuits.

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Section: Filter Designmentioning

confidence: 99%