Design of Triple-Mode Bandpass Filter Using Improved Hexagonal Loop Resonator

Mo, Shao‐Guo; Yu, Zhiyuan; Zhang, and Long

doi:10.2528/pier09080304

Cited by 57 publications

(37 citation statements)

References 18 publications

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“…In [6] and [7], microstrip triple-mode filters were implemented by using a half-wavelength transmission line resonator with a couple of center symmetrical loaded stubs of different lengths or shapes. Microstrip triple-mode filters also can be realized by loading stubs to a loop [8] or adopting fractal defection in triangular patch [9]. Recently, hybrid multi-mode BPFs using associated resonators draw the interests of experts since it is easier to control the resonant modes of each resonators.…”

Section: Introductionmentioning

confidence: 99%

“…Dual mode characteristic is produced by introducing perturbation to a ring resonator to split two degenerated modes of the resonator. From then on, various dual-mode [2][3][4][5] and multimode [7][8][9] microstrip resonators and filters have been proposed. By loading a stub to a microstrip resonator, non-degenerated modes can be excited and dual-/multi-mode characteristics can be achieved [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Design and Implementation of Compact Hybrid Four-Mode Bandpass Filter With Multi-Transmission Zeros

Guan¹,

Wang²,

Wang³

et al. 2012

PIER Letters

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Abstract-This paper presents a novel compact microstrip hybrid four-mode bandpass filter (BPF) with good selectivity and multitransmission zeros. By adding an external resonator to a triplemode stub-loaded resonator, four modes are generated in the desired passband and a hybrid four-mode BPF is implemented. Odd-and even-mode theory is introduced to investigate the mode characteristics of triple-mode resonator in detail. Circuit model and coupling matrix are built to further explain the proposed methodology. A microstrip BPF with central frequency of 3.4 GHz for wireless communication was designed and fabricated. Three transmission zeros are obtained at 3.2 GHz, 3.55 GHz and 3.73 GHz, which improve selectivity and outof-band rejection of the filter. The measured results of the fabricated filter represent good in-band and sharp sideband characteristic, which match well with simulated results.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and Implementation of Compact Hybrid Four-Mode Bandpass Filter With Multi-Transmission Zeros

Guan¹,

Wang²,

Wang³

et al. 2012

PIER Letters

View full text Add to dashboard Cite

show abstract

“…The methodologies for designing microwave filters are known for a long time but a lot of researchers are still introducing new solutions (cf. [7][8][9][10][11][12][13][14]). In this paper, we are focusing on the related problem of coupling coupling matrix extraction.…”

Section: Introductionmentioning

confidence: 99%

The Analytic Extraction of the Complex-Valued Coupling Matrix and Its Application in the Microwave Filter Modeling

Gulgowski¹,

Michalski²

2012

PIER

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Abstract-The idea behind the coupling matrix identification is to find the coupling matrix corresponding to the measured or designed scattering characteristics of the microwave filter. The typical attitude towards coupling matrix parameter extraction is to use some optimization methods to minimize the appropriate cost function. In this paper, we concentrate on the analytic solutions -how they may be found and their application in further optimization processes. In general case, the suggested method generates complex-valued coupling matrix. For a special case of the filter without cross-couplings we give fast and simple recursive method of finding such complexvalued coupling matrix. The method is based on Laplace's formula for expanding the determinant. The complex-valued coupling matrix is used as a good starting point for the optimization methods to find the regular coupling matrix. The examples are presented showing that the optimization arrives to global minimum starting from real parts of complex-valued entries considerably more often than when the starting point is selected randomly.

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“…They are widely studied, and different kinds of bandpass filters have been proposed [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. To make the filters more compact, one of the effective ways is to modify the traditional resonator to generate additional modes, causing the resonator to have multiple resonant frequencies, thus one resonator in physical can be treated as multiple resonators in electrical [9].…”

Section: Introductionmentioning

confidence: 99%

Novel Planar Multimode Bandpass Filters With Radial-Line Stubs

Zhang¹,

Yu²,

Mo³

2010

PIER

Self Cite

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Abstract-This paper presents a novel approach for designing planar multimode wideband bandpass filters with good selectivity. The multimode resonator is composed of an open-ended microstrip line with length of half-wavelength (λ/2) and several radial-line stubs. By using different kinds of radial-line loaded stubs, different kinds of responses including three-pole and four-pole bandpass filters can be realized. Depending on electric field distribution and equivalent circuit model, the characteristics of the filter are analyzed. To verify the proposed method, two filters are implemented. The measured results exhibit good agreement with the simulation.

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Design of Triple-Mode Bandpass Filter Using Improved Hexagonal Loop Resonator

Cited by 57 publications

References 18 publications

Design and Implementation of Compact Hybrid Four-Mode Bandpass Filter With Multi-Transmission Zeros

Design and Implementation of Compact Hybrid Four-Mode Bandpass Filter With Multi-Transmission Zeros

The Analytic Extraction of the Complex-Valued Coupling Matrix and Its Application in the Microwave Filter Modeling

Novel Planar Multimode Bandpass Filters With Radial-Line Stubs

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