General optimization algorithm for reduction of coupling matrix of chebyshev filtering functions

Latif, Muhammad; Salfi, Abaid Ullah

doi:10.1109/ibcast.2012.6177581

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…So it is very important to design the filters with good performance. Microstrip filters have been widely used in many applications since its low cost, cheap production and easy fabrication [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…In order to achieve compact size and controlled transmission zero(TZ), box-section configuration has been applied in many filter designs [1][2][3][4]. The box-section filter with fourth-order struction has one TZ and present the advantages that the location of the TZ can be freely controlled [2].However, the frequency selectivity of this design is not very well since only one transmission zero introduced near the passband.…”

Section: Introductionmentioning

confidence: 99%

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Compact box-section bandpass filter with enhanced stopband characteristics

MingxiaZhang

Wei

Yuan

2013

2013 International Workshop on Microwave and Millimeter Wave Circuits and System Technology

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A compact bandpass filter (BPF) with enhanced stopband characteristics is presented in this paper. The proposed BPF consists of four improved stepped impedance resonators (SIRs),which implements into a boxsection strcture. To improve the frequency selectivity and the stopband characteristics, additional transmission zero (TZ) was introduced by mixed electric and magnetic (EM) coupling. A new filter with 31.2% fractional bandwidth (FBW) has been designed and fabricated to verify the validity of the proposed method. The filter has two transmission zeros, where TZ 1 is located in 0.4GHz with 78.7dB rejection and TZ 2 is located in 2.7GHz with 50.2 dB rejection. Measured results are in good agreement with the electromagnetic simulation.Index Terms -bandpass filter, box-section, transmission zeros, mixed coupling .

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compact box-section bandpass filter with enhanced stopband characteristics

MingxiaZhang

Wei

Yuan

2013

2013 International Workshop on Microwave and Millimeter Wave Circuits and System Technology

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A Novel Coupling Structure for Inline Realization of Cross-Coupled Rectangular Waveguide Filters

2020

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This paper presents a new cross-coupling structure for introducing transmission zeros in waveguide filters with inline configuration. The cross-coupling is realized by an internal bypass metallic loop structure (wire), short-circuited to the filter top plate and passing through the waveguide cavities. Positive and negative cross-couplings are realized by only varying the length of the structure suitably. Fullwave electromagnetic (EM) simulations of the coupling structure are performed for extracting the coupling coefficient sign and value (k). The relationship of the values of k with the coupling structure dimensions is presented graphically. The loading effect of coupling structure on the resonance frequency of the waveguide cavities is also discussed, as well as the possibility of post-manufacturing tunability. The feasibility of the proposed coupling structure is demonstrated by the design of three test filters. Two filters verify the in-line design of a triplet configuration using the proposed coupling wire to introduce a transmission zero below or above the passband. These filters have been also manufactured and measured for an experimental validation of the new structure. The third filter demonstrates the use of the wire loop to create a negative coupling in a cross-coupled configuration. Power handling capability of this configuration has been also thoroughly analyzed by full-wave EM simulation. INDEX TERMS Cross-coupling, electromagnetic (EM), inline, non-resonating node (NRN), trisection, transmission zeros (TZs), quartet section waveguide resonators.

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