Novel trigonal dual-mode filter with controllable transmission zeros

Wei, Chaolei; Jia, Baofu; Zhu, Zhaojun; Tang, Ming‐Chun

doi:10.1049/iet-map.2010.0517

Cited by 7 publications

(9 citation statements)

References 14 publications

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“…Stub-loaded dual-mode filter has four fundamental resonant configurations, which are the short-ended stub loaded open-ended resonator [3], the short-ended stub loaded short-ended resonator [4], the open-ended stub loaded short-ended resonator, and the open-ended stub-loaded open-ended resonator [5], [6], respectively. This paper uses the short-ended stub loaded resonator shown in Fig.…”

Section: Volume 8 Number 3 June 2016mentioning

confidence: 99%

“…[6] shows a dual-mode filter with a triangular structure that is a compact structure and the relationship between the zero location and the resonance frequency as [5], which can be obtained by changing the length of the inductive coupling lines. But the isolation of the filters in [5], [6] is not high. [4] reports a method for the enhancement of source-load coupling.…”

Section: Introductionmentioning

confidence: 99%

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Compact Wide Stop-Band Dual-Mode Filter with Four Transmission Zeros

Xue¹,

Ji²

2016

IJCEE

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Abstract:The size and the isolation of filters impact directly the whole front-end system integration and performance. The miniaturization and high-isolation of filters is always a hot spot of research. In this paper, a compact high-isolation band-pass filter is designed based on the dual mode short-ended resonator. The technique of the stepped-impedance lines can adjust the stop-band width by the length and width of the lines. In the designing process, the length of the feeders computed in an easy and effective way is given to provide the estimated value. The capacitive source-load coupling provides four transmission zeros to enhance the selectivity. The area of this filter, of which the chamfer micro-strips are used to decrease the size, is only 36.7% of the traditional ones. In addition, the characteristics of this filter are analyzed, from which the design graph is given and the measured results match well with the simulations.

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Section: Volume 8 Number 3 June 2016mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Compact Wide Stop-Band Dual-Mode Filter with Four Transmission Zeros

Xue¹,

Ji²

2016

IJCEE

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“…To improve the frequency selectivity of the power divider, there should be additional transmission zeros adjacent to the passband. Therefore, capacitive source‐load coupling structure is used between the input and output ports of the filter . The input and output microstrip line of the filter are placed close to each other, as shown in Figure , the dimensions are optimized by the full‐wave simulator (HFSS) and the final optimized value of S is 0.2 mm.…”

Section: Circuit Designmentioning

confidence: 99%

Compact filtering power divider with good frequency selectivity and wide stopband based on composite right‐/left‐handed transmission lines

Ren

Song

et al. 2014

Micro & Optical Tech Letters

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A novel compact power divider with good frequency response and wide stopband based on composite right-/left-handed (CRLH) transmission line is presented in this article. To provide bandpass-filtering frequency response, the bandpass filtering circuits is applied to this power divider using the CRLH resonators. The bandpass filtering circuit can generate two transmission zeros at the lower and upper stopband and have a wide upper stopband. Besides, the phase shift of the CRLH filter is tuned to be 90 for the sake of replacing the conventional quarter-wave length branch line in the power divider. Moreover, the capacitive coupling between the input and output of the resonator is used simultaneously to generate three additional transmission zeros beside the passband edges. Then, the frequency selectivity of the power divider is greatly improved. A resistor is placed at the center of the symmetric plane to produce good isolation between the two outputs. A filter-integrated power divider operating at 3.7 GHz is implemented. Good agreement between the simulated and measured results is observed.

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“…However, the size of this filter is a little large. At the same time, because adjusting the position of the transmission zeros can get high frequency selectivity, numerous papers ( [2][3][4][5]) have been devoted to realizing controllable transmission zeros.…”

Section: Introductionmentioning

confidence: 99%

“…Compared with the conventional half-and quarter-wavelength stepped-impedance resonators (SIRs), [2] proposed that unequal-length shunted-line stepped-impedance resonator (shunted-line SIR) can provide an efficient way to generate multitransmission zeros and one controllable transmission zero near the passbands to improve the out-of-band rejection. In [4], Wei et al designed a novel trigonal dual-mode filter with controllable transmission zeros, and both dual-mode response and controllable transmission zeros are realized by using cross-coupling. But it is complicated to control the zeros distribution, especially in first time design this type filter, and the roll-off in the low stopband (without transmission zeros) needs to be improved.…”

Section: Introductionmentioning

confidence: 99%

A Compact Multilayer Configuration Filter With Inner Mixed Electric and Magnetic Coupling

Tang¹,

He²,

Xiao-bo³

2013

PIER C

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A novel cascade microstrip filter with mixed electric and magnetic coupling is proposed and examined. For the first time, we designed a novel multilayer configuration resonator with a compact size. Compared with conventional open-loop filter, the size decreased 75%. First, using novel multilayer configuration resonator instead of monolayer configuration resonator, the size is decreased about 45%. Meanwhile, two microstrip patches serve as inner coupling capacitor, which create and strengthen electric field. Owing to this inner coupling, the size of filter can be further reduced. Moreover, with a section of high characteristic impedance transmission line connected to the ground though a via-hole, it can serve as coupling inductor and create main magnetic field. Based on this structure, mixed EM coupling is realized and can generate additional transmission zero, which means that adopting low-order filter can achieve the same characteristic as high-order filter. Based on the above solutions, the filter size can be sharply decreased to 12.5 mm × 7.7 mm (i.e., 0.05λ g × 0.033λ g). Furthermore, advantages of using this type filter are not only low insert loss, but also increased attenuation out-of-band with controllable transmission zeros.

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Novel trigonal dual-mode filter with controllable transmission zeros

Cited by 7 publications

References 14 publications

Compact Wide Stop-Band Dual-Mode Filter with Four Transmission Zeros

Compact Wide Stop-Band Dual-Mode Filter with Four Transmission Zeros

Compact filtering power divider with good frequency selectivity and wide stopband based on composite right‐/left‐handed transmission lines

A Compact Multilayer Configuration Filter With Inner Mixed Electric and Magnetic Coupling

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