Miniature Suspended-Substrate Bandpass Filter

Belyaev, B. A.; Leksikov, A.A.; Сержантов, А. М.; Tyurnev, V. V.

doi:10.2528/pierc10070604

Cited by 7 publications

(9 citation statements)

References 10 publications

(9 reference statements)

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“…coupling coefficient k(ω) outside the resonant frequency [11]. Similar effects in a suspended stripline and microstrip filters with tap external coupling were described in [8,12]. Note that the point where two zeros meet and disappear may be either above or below the frequency of the mode crossing.…”

Section: Dual-mode Resonatormentioning

confidence: 84%

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Highly Selective Suspended Stripline Dual-Mode Filter

Belyaev¹,

Leksikov²,

Сержантов³

et al. 2011

PIER Letters

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Abstract-Miniature bandpass filter constructions based on a novel dual-mode suspended stripline resonator are proposed. Because of a special structure of the resonator, the frequencies of two first oscillation modes may be brought closer together. That allows realizing narrowband filters with the wide upper stopband. The filters have low insertion loss in the passband at small dimensions. Several transmission zeros substantially improve the filter performance. The derived coupling coefficients account for some features in the frequency response of the filter. The second-order and fourth-order filters with transmission zeros have been fabricated and measured.

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Section: Dual-mode Resonatormentioning

confidence: 84%

“…The experimental characteristics of the bandpass filter were presented in [7]. Transmission zeros below and above the passband of the filter can be created by inserting a two-end grounded strip conductor between the adjacent resonators [8].…”

Section: Introductionmentioning

confidence: 99%

Highly Selective Suspended Stripline Dual-Mode Filter

Belyaev¹,

Leksikov²,

Сержантов³

et al. 2011

PIER Letters

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“…This optimization is based on the "physical rules". These rules are universal for all resonator bandpass filters [13,14]. They are successfully used in the filter expert system Filtex32 [15].…”

Section: Filter Designmentioning

confidence: 99%

“…Any odd normal distortion we eliminate by a proper correction of the detuned resonant frequencies, that is, we vary the shortcuts ∆l 1 and ∆l 2 . Formulas for the ripple distortions together with the appropriate rules for their elimination are published in [13] for the fourth order filters, and in [14] for the sixth order filters.…”

Section: Filter Designmentioning

confidence: 99%

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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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Implementation of cross couplings in microwave bandpass filters

Belyaev

Сержантов

Bal’va

et al. 2014

Micro & Optical Tech Letters

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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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Miniature Suspended-Substrate Bandpass Filter

Cited by 7 publications

References 10 publications

Highly Selective Suspended Stripline Dual-Mode Filter

Highly Selective Suspended Stripline Dual-Mode Filter

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

Implementation of cross couplings in microwave bandpass filters

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