Miniature bandpass microwave filter with interference suppression by more than 100 dB in a wide rejection band

Belyaev, B. A.; Сержантов, А. М.; Tyurnev, V. V.; Leksikov, A.A.; Bal’va, Ya. F.

doi:10.1134/s1063785013080026

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…One more quasi‐lumped suspended stripline resonator was proposed in . This resonator has the same advantages as the three first quasi‐lumped resonators.…”

Section: Stripline Filter On Double‐layer Suspended Substratementioning

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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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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“…One more quasi‐lumped suspended stripline resonator was proposed in . This resonator has the same advantages as the three first quasi‐lumped resonators.…”

Section: Stripline Filter On Double‐layer Suspended Substratementioning

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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“…In this paper, we first studied resonant properties of a novel quasi-lumped planar resonator [11,12]. This study together with use of physical optimization rules [13,14] has allowed us to design a bandpass filter of the sixth order with wide and deep upper stopband.…”

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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“…In this way, it is possible not only to reduce filter dimensions more than ten times, but also to significantly increase their selectivity due to cross coupling between nonneighboring resonators [12]. It is important to note that, although filters on suspended substrates are more difficult to fabricate than are the typical microstrip structures, a two layer suspended design can be implemented in monolithic structures [13] using the technology of multilayer inte grated circuits based on low temperature cofired ceramics.…”

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confidence: 99%

A new design of a miniature filter on microstrip resonators with an interdigital structure of conductors

et al. 2015

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A microstrip bandpass filter of new design based on original resonators with an interdigital struc ture of conductors has been studied. The proposed filters of third to sixth order are distinguished for their high frequency selective properties and much smaller size than analogs. It is established that a broad stop band, extending up to a sixfold central bandpass frequency, is determined by low unloaded Q of higher resonance mode and weak coupling of resonators in the pass band. It is shown for the first time that, as the spacing of interdigital stripe conductors decreases, the Q of higher resonance mode monotonically drops, while the Q value for the first operating mode remains high. A prototype fourth order filter with a central frequency of 0.9 GHz manufactured on a ceramic substrate with dielectric permittivity ε = 80 has microstrip topology dimen sions of 9.5 × 4.6 × 1 mm 3 . The electrodynamic 3D model simulations of the filter characteristics agree well with the results of measurements.

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Miniature bandpass microwave filter with interference suppression by more than 100 dB in a wide rejection band

Cited by 4 publications

References 13 publications

Implementation of cross couplings in microwave bandpass filters

Implementation of cross couplings in microwave bandpass filters

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

A new design of a miniature filter on microstrip resonators with an interdigital structure of conductors

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