Miniaturized Dual-Mode Bandpass Filter with Controllable Harmonic
                        Response for Dual-Band Applications

Wang, J.-P.; Wang, L.; Guo, Yong‐Xin; Wang, Y. X.; Fang, Da‐Gang

doi:10.1163/156939309789476482

Cited by 20 publications

(17 citation statements)

References 11 publications

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“…They have been widely used in microwave filters due to their small size, planner structure and narrow realizable bandwidth. Although these resonators or other modified versions of them such as hexagonal [2][3][4] and spiral resonators [5,6] have been used to realize canonical [7][8][9][10][11][12][13], dual [14][15][16][17][18][19][20][21], triple [22,23] and quadpassband filters [24] with complicated transmission characteristics, all of these filters suffer from the time consuming full-wave-based process of determining the physical parameters of the filter from the desired coupling factor and Q ext . The ability of soft computing techniques in modeling complicated problems in a vanishingly short time instead of using numerical or analytical approach [25][26][27][28][29][30][31][32] may provide a fast and accurate solution to this problem.…”

Section: Introductionmentioning

confidence: 99%

Active Learning Method for the Determination of Coupling Factor and External Q in Microstrip Filter Design

Rezaee¹,

Tayarani²,

Knöchel³

2011

PIER

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Abstract-In the final step of any filter design process, the desired center frequency, coupling factor and external quality factor (Q ext ) are used to determine the physical parameters of the filter. Although in the most cases the physical dimensions of a single resonator for a given center frequency are determined using exact analytical or simple approximate equations, usually such simple equations cannot be found to easily relate the required coupling factor and Q ext to the physical parameters of the filter. Analytical calculation of coupling factor and Q ext versus dimensions are usually complicated due to the geometrical complexities or in some cases such as microstrip resonators due to the lack of exact solution for the field distribution. Therefore coupling factor and Q ext of various kinds of resonators, especially microstrip resonators, are related to the physical parameters of the structure by the use of time consuming full wave simulations. In this paper a surprisingly fast and completely general approach based on a soft computing pattern-based processing technique, called active learning method (ALM) is proposed to overcome the time consuming process of coupling factor and Q ext determination. At first the ALM technique and the steps of modeling are generally described, then as an example and in order to show the ability of the method this modeling approach is implemented to model the coupling factor and Q ext surfaces of microstrip open-loop resonators versus physical parameters of the structure. Using the ALM-based extracted surfaces for coupling factor and Q ext , two four pole Chebychev bandpass filters are designed and fabricated. Good agreement between the measured and simulated results validates the accuracy of the proposed approach.

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Section: Introductionmentioning

confidence: 99%

Active Learning Method for the Determination of Coupling Factor and External Q in Microstrip Filter Design

Rezaee¹,

Tayarani²,

Knöchel³

2011

PIER

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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

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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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“…Since most mobile devices become smaller and leave limited space for the placement of the filters, it is of importance to miniaturize the required filter size. Recently, much research work on miniaturized microstrip bandpass filter has been performed and various kinds of resonators have be presented [5][6][7][8][9][10][11][12][13][14][15]. Among them, dual-mode resonators are most widely used in the miniaturized filters designs [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, much research work on miniaturized microstrip bandpass filter has been performed and various kinds of resonators have be presented [5][6][7][8][9][10][11][12][13][14][15]. Among them, dual-mode resonators are most widely used in the miniaturized filters designs [5][6][7][8][9][10][11]. In [5][6][7][8], square loop resonators with different loaded structures such as capacitive open-loop arms [5], distributed capacitors [6], treeshaped patches [7] and slow-wave open loop arms [8] are utilized to obtain size reduction.…”

Section: Introductionmentioning

confidence: 99%

“…Among them, dual-mode resonators are most widely used in the miniaturized filters designs [5][6][7][8][9][10][11]. In [5][6][7][8], square loop resonators with different loaded structures such as capacitive open-loop arms [5], distributed capacitors [6], treeshaped patches [7] and slow-wave open loop arms [8] are utilized to obtain size reduction. In [9], the authors present the perturbed dualmode ring resonators to miniaturize the areas.…”

Section: Introductionmentioning

confidence: 99%

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Novel Miniaturized Bandpass Filters Using Spiral-Shaped Resonators and Window Feed Structures

Dai¹,

Xia²

2010

PIER

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Abstract-In this paper, we present a new class of miniaturized microstrip bandpass filters with low-insertion loss, sharp-rejection and narrow-band performance. The proposed filters are composed of two spiral-shaped resonators and rectangle window feed structures. Both back-to-back and interdigital combinations of the resonators are adopted to obtain the miniaturized filter size. Compared to the traditional square loop bandpass filter, the sizes are reduced by 82% and 80%. It is also found that there is a pair of transmission zeros located on each side of the passbands, resulting in high selectivity. To validate the proposed idea, two demonstration filters with back-toback and interdigital spiral-shaped resonators are implemented. The measured results exhibit good agreement with the full-wave simulation results.

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Miniaturized Dual-Mode Bandpass Filter with Controllable Harmonic Response for Dual-Band Applications

Cited by 20 publications

References 11 publications

Active Learning Method for the Determination of Coupling Factor and External Q in Microstrip Filter Design

Active Learning Method for the Determination of Coupling Factor and External Q in Microstrip Filter Design

Novel Planar Multimode Bandpass Filters With Radial-Line Stubs

Novel Miniaturized Bandpass Filters Using Spiral-Shaped Resonators and Window Feed Structures

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