Design of multiple-passband filters using coupling matrix optimisation

Shang, Xiaobang; Wang, Yi; Nicholson, Gemma; Lancaster, M.J.

doi:10.1049/iet-map.2011.0261

Cited by 29 publications

(24 citation statements)

References 24 publications

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“…To generate the coupling matrix, a synthesis method based on optimization [18] is applied. For the optimization to converge fast, a carefully chosen initial matrix is highly desired.…”

Section: A Topology and Coupling Matrixmentioning

confidence: 99%

Microstrip wideband diplexer with narrow guard band based on all-resonator structures

Wang

Ogbodo

2016

2016 46th European Microwave Conference (EuMC)

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Abstract-This paper presents a wideband microstrip diplexer with adjacent channels based on an all-resonator structure. The diplexer demonstrates an overall bandwidth of 23.7% between 1.71 GHz and 2.17 GHz and a narrow guard band of only 40 MHz. Two trisection resonator structures are introduced to generate asymmetric transmission zeros to increase isolation between the two channels. The coupling matrix for the all-resonator diplexer is acquired. The diplexer is designed and fabricated on a Rogers RO4003C substrate. The measured results show insertion losses of 1.31 dB and 1.2 dB in the two channels, and an isolation of over 28 dB. These results are in good agreement with the simulation.

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“…To generate the coupling matrix, a synthesis method based on optimization [18] is applied. For the optimization to converge fast, a carefully chosen initial matrix is highly desired.…”

Section: A Topology and Coupling Matrixmentioning

confidence: 99%

Microstrip wideband diplexer with narrow guard band based on all-resonator structures

Wang

Ogbodo

2016

2016 46th European Microwave Conference (EuMC)

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“…This filter is designed to have the following specifications: the center frequency is 9.965 GHz for the first passband and 10.035 GHz for the second passband, both passbands have a desired return loss of 20 dB and the same bandwidth of 30 MHz, the attenuation level for the middle stopband is better than 26 dB. The N × N coupling matrix of this dual‐band filter, as depicted below, is generated by a synthesis technique described in . Their corresponding S‐ parameter responses can be found in Figure .…”

Section: Design Stepsmentioning

confidence: 99%

The design of waveguide filters based on cross‐coupled resonators

Shang

Xia

Lancaster

2013

Micro & Optical Tech Letters

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In this article, two novel microstrip band-stop filters using the gradually variational stepped impedance hairpin resonator with DGS or not are presented. By using the gradually variational stepped impedance hairpin resonator, the filters have remarkable advantages, such as compact size, simple structure, and high selectivity. Two band-stop filters are designed, fabricated, and measured. The measurement results show good agreement with the simulation ones. ACKNOWLEDGMENTSThis work was supported by National Natural Science Foundation of China under Grant 61171051. The authors would like to thank the persons in Agilent Open Laboratory in Beijing, for their technical assistance. ABSTRACT: This article addresses the physical realization of crosscoupled waveguide filters based on electromagnetic (EM) simulations. For this design procedure, the filter structure is simulated by successively adding one resonator at a time. The desired filter response is achieved without the need of a global optimisation on all the mechanical dimensions within an EM simulator. This reduces the design time required for a crosscoupled waveguide filter and allows the possibility of building high-order waveguide filters with complex crosscouplings. A sixth order X-band dual-band filter with a center frequency of 10 GHz and a fractional bandwidth of 1% is designed using this procedure and presented here as an example. Excellent agreement between simulation results and theoretical results from coupling matrix verifies the proposed approach. THE DESIGN OF WAVEGUIDE FILTERS BASED ON CROSS-COUPLED RESONATORS

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“…The design procedure of the diplexer coupling matrix is done by applying a gradient-based local optimisation technique, which is similar to the approach in [2], [7][8]. It is based on minimisation of a cost function that is evaluated the values of scattering parameters at frequency locations including reflection zeros, maximum return points and passband edges.…”

Section: Coupling Matrix Of Diplexersmentioning

confidence: 99%

Responses comparisons for coupled-resonator based diplexers

Xia

Shang

Lancaster

2012

3rd Annual Seminar on Passive RF and Microwave Components

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Previously we have proposed a novel coupled-resonator based multiplexer structure that eliminates the need for an additional common junction [2] such as a manifold, T -junction or power splitter. This new approach to multiplexer design is able to achieve reductions in the size and volume of the circuit. In this paper, the relationships between the responses and topologies of this novel type of diplexer structures are investigated.

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Design of multiple-passband filters using coupling matrix optimisation

Cited by 29 publications

References 24 publications

Microstrip wideband diplexer with narrow guard band based on all-resonator structures

Microstrip wideband diplexer with narrow guard band based on all-resonator structures

The design of waveguide filters based on cross‐coupled resonators

Responses comparisons for coupled-resonator based diplexers

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