Miniature coaxial resonator and related bandpass filter with ultra-wide stopband

where the symbol * T denotes the transpose of a matrix. To put it alternatively, the diagonal elements of [S] dictate the symmetry of the network, while the off-diagonal ones, the reciprocity of it. For the sake of completeness, we note that the passivity of the medium is determined by the negativeness of the matrix ½2r2½2r CT 2jABSTRACT: New quasi-lumped resonator bandpass filters with cross couplings are presented. Coaxial and suspended stripline structures are considered. These filters are notable for their extremely wide and deep upper stopbands at small dimensions. They also have transmission zeros near the passband that significantly improve frequency selectivity. Photographs and measured frequency responses for the four fabricated filters are presented.

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“…The frequency responses of the cross‐coupling free bandpass filters of the forth order were studied in Refs. .…”

Section: Quasi‐lumped Coaxial Filtermentioning

confidence: 99%

Implementation of cross couplings in microwave bandpass filters

Belyaev

Сержантов

Bal’va

et al. 2014

Micro & Optical Tech Letters

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“…One can see that the proposed suspended stripline BPFs have extremely wide and deep stopband. They are inferior only to the latest novel coaxial BPFs but are smaller them in size and are more fabricable.…”

Section: A Fifth‐order Bpfmentioning

confidence: 99%

“…One of ways of further widening the stopband lies through developing new structures of resonators whose the second mode frequency many times exceeds the first mode frequency. For example, a fourth‐order BPF based on novel coaxial resonators has the upper stopband at the level of −90 dB which extends up to 47 f 0 . However, from point of view of manufacturability, reliability, and cost such BPFs are significantly worse than constructions based on stripline or microstrip structures.…”

Section: Introductionmentioning

confidence: 99%

Stripline Bandpass Filter with Wide Stopband and Rejection Level Up to 100 dB

Belyaev

Сержантов

Tyurnev

et al. 2013

Micro & Optical Tech Letters

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A novel miniature stripline resonator performed on a double‐layer suspended substrate and bandpass filters (BPFs) based on it are proposed. The filters have wide stopband with high attenuation. A fifth‐order BPF has been designed and fabricated. The filter stopband at level of −100 dB extends up to the frequency that exceeds the passband center frequency by factor of 10. It is shown that miniature filters based on the proposed resonator could be effectively fabricated by low temperature cofired ceramics technology. © 2013 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2866–2869, 2013

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“…The further widening of the stopband needs the development of new structures of resonators with the second mode frequency many times higher than the first mode frequency. For example, a fourth-order filter based on novel coaxial resonators [9] has the upper stopband at the level of −90 dB which extends up to 47f 0 [10]. However, from the point of view of manufacturability, reliability, and cost, such filters are significantly worse than constructions based on stripline or microstrip structures.…”

Section: Introductionmentioning

confidence: 99%

Planar Bandpass Filter With 100-Db Suppression Up to Tenfold Passband Frequency

Belyaev¹,

Сержантов²,

Tyurnev³

et al. 2014

PIER C

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Abstract-This paper proposes a miniature microwave bandpass filter. It comprises quasi-lumped suspended substrate stripline resonators of a new type. Their common substrate consists of two contiguous dielectric layers. Every resonator in the filter has three parallel strip conductors. Two of them are placed on the outer substrate surfaces and the rest is placed inside the substrate. The filter of the sixth order was designed with the use of special optimization rules that are universal for all resonator filters. The substrate of the fabricated filter was made of RT/Duroid 5880 (ε r = 2.2, tan δ = 0.002) with thickness of 0.127 mm. It has dimensions of 12 mm × 45.5 mm. The measured passband has a center frequency of 1.01 GHz, 3-dB fractional bandwidth of 11%, and minimum insertion loss of 1.4 dB. The 100-dB upper stopband extends up to 10.5 GHz.

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Miniature coaxial resonator and related bandpass filter with ultra-wide stopband

Cited by 6 publications

References 11 publications

Implementation of cross couplings in microwave bandpass filters

Implementation of cross couplings in microwave bandpass filters

Stripline Bandpass Filter with Wide Stopband and Rejection Level Up to 100 dB

Planar Bandpass Filter With 100-Db Suppression Up to Tenfold Passband Frequency

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