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

Belyaev, B. A.; Сержантов, А. М.; Tyurnev, V. V.; Leksikov, A.A.; Bal'va, Yaroslav F.

doi:10.1002/mop.28013

Cited by 5 publications

(7 citation statements)

References 9 publications

(6 reference statements)

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“…Besides two transmission zeros at the frequencies f z1 = 925 MHz and f z2 = 1077 MHz, the cross coupling generates a series of spurious transmission peaks at all its resonant frequencies, but their level is lower than the noise level and they are not visible. The first visible peak of −42 dB at f p1 = 9.653 GHz is due to the third oscillation mode of the resonators .…”

Section: Stripline Filter On Double‐layer Suspended Substratementioning

confidence: 99%

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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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Section: Stripline Filter On Double‐layer Suspended Substratementioning

confidence: 99%

“…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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“…The idea of 2‐layered structure was presented by several groups nearly the same time . Earlier, we proposed a 3‐layered stripline resonator, which enables designing and fabricating a 6‐pole filter that has 10.7 f 0 stopband with 100 dB depth. Later, a multi‐conductor microstrip resonator was proposed that has sufficiently higher Q ‐factor in comparison to that of other compact microstrip resonators.…”

Section: Introductionmentioning

confidence: 99%

Multilayered multiconductor stripline resonator and its application to bandpass filter with wide stopband

Belyaev

Сержантов

Leksikov

et al. 2017

Microw. Opt. Technol. Lett.

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A multilayered, multi‐conductor stripline resonator is proposed. It is shown that increase in the number of conductors leads to increase the unloaded Q‐factor and decrease the resonant frequency, with increasing the effects for thinner dielectric interlayer. Application of the resonator to the bandpass filter enables designing bandpass filters with very wide and deep stopbands. To prove this, a 4‐pole bandpass filter, having central frequency 360 MHz and an overall size of 15.5 × 31.75 × 8.45 mm3, was designed and fabricated.

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“…In [11, 12] the second harmonics were removed by equalizing modal phase velocities. In [13], quarter-wavelength resonators were arranged in a double-layer suspended substrate to cancel the high-order mode currents. In [14], using discriminating coupling, the second harmonic was blocked.…”

Section: Introductionmentioning

confidence: 99%

Analysis and design of compact wide bandpass filter with ultra-wide stopband using multi-stub loaded resonator

Tang

2016

Int. J. Microw. Wireless Technol.

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A compact microstrip multi-stub loaded bandpass filter (BPF) with ultra-wide stopband is introduced and investigated. Lumped-equivalent circuit (LEC) method is adopted to analyze the characteristics of the in-band response based upon the low frequency LEC and even-odd mode analytical method. Besides, equivalent transmission line circuit method with even-odd mode analytical method are adopted to discuss the mechanism of the out-band rejection based upon the transmission poles and the transmission zeros analysis of the even-/odd-mode equivalent circuits. Accordingly, the design and the optimization procedures of this type of filters are summarized. To experimentally validate the proposed method, the filter is fabricated and measured. The measured results illustrate this BPF centered at f0 = 2.8 GHz, with −3 dB fractional bandwidth of 109.3%, the insert loss (IL) of less than 1 dB from 1.4 to 4 GHz, and the rejection level of 20 dB from 5.1 to 33.5 GHz(1.82f0 to 11.96f0).

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

Cited by 5 publications

References 9 publications

Implementation of cross couplings in microwave bandpass filters

Implementation of cross couplings in microwave bandpass filters

Multilayered multiconductor stripline resonator and its application to bandpass filter with wide stopband

Analysis and design of compact wide bandpass filter with ultra-wide stopband using multi-stub loaded resonator

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