Wideband Dual-Mode Microstrip Filter Using Short-Ended Resonator With Centrally Loaded Inductive Stub

Sun, Shou Jia; Wu, Bian; Su, Tao; Deng, Kun; Chen, Liang

doi:10.1109/tmtt.2012.2221737

Cited by 30 publications

(26 citation statements)

References 19 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%

“…The structure of the open-ended resonator decrease the size of filter. [4] reports a closed loop structure, which can reduce the number of the earthing compared with the same style filter. So, it enables the miniaturization of the whole filter and makes the integration easier.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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

Xue¹,

Ji²

2016

IJCEE

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“…All the dual-band BPFs presented above were designed using two or more resonators. For miniaturization, a variety of dual-mode resonators were proposed to design filters [10][11][12]. Many reports have been published about dual-mode dual-band BPFs [13][14][15][16][17][18][19], in which the first harmonic even-and odd-mode are utilized to form the second passband, thus leading to both passbands dependent on each other which is undesirable.…”

Section: Introductionmentioning

confidence: 99%

Dual-Band Bandpass Filter With Wide Upper Stopband Using Novel Stepped Impedance Stub-Loaded Quad-Mode Resonator

Lin¹,

Zhang²,

Sun³

et al. 2015

PIER Letters

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Abstract-This paper presents a wide upper stopband dual-band bandpass filter (BPF) with controllable passband frequencies and bandwidths as well as a high out-of-band rejection level. The proposed filter is realized by utilizing a novel stepped impedance stub-loaded quad-mode resonator. All the four-mode equivalent circuits of the resonator are quarter-wavelength stepped impedance resonators (SIRs), and their fundamental resonance frequencies are used to form the passbands, so the designed filter has a compact circuit size. By controlling the impedance and length ratios of the stubs of the resonator, wide upper stopband performance is obtained. Hook-shape feed-lines and source-load coupling are applied to provide appropriate external coupling and generate three extra transmission zeros, which greatly improve the selectivity of the proposed filter. An experimental filter operating at 1.5 and 3.5 GHz is designed, fabricated, and measured for validation. The measured results have good agreement with the simulated ones.

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“…In this way, there are at least two resonators required. For a compact size, filters based on dual-mode resonators have been attracting much more attention [8][9][10][11][12]. In [13][14][15][16][17][18][19], a single dual-mode resonator is employed to realize a dual-band bandpass filter (BPF) with compact size and high passband selectivity.…”

Section: Introductionmentioning

confidence: 99%

A Novel Quad-Mode Resonator and Its Application to Dual-Band Bandpass Filters

Sun¹,

Lin²,

Wu³

et al. 2013

PIER Letters

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Abstract-In this paper, a novel square-loop quad-mode resonator is presented. Due to its symmetry, the even-odd-mode method is utilized to analyze the resonant characteristics. Two modes resonating at lower frequencies are employed to construct the first passband, and other two form the second passband. Meanwhile, both passband center frequencies can be controlled by the corresponding physical dimensions. Two dual-band bandpass filters (BPFs) without and with source-load coupling operating at 2.4 and 3.5 GHz are designed based on the proposed quad-mode resonator. Due to the source-load coupling, the passband selectivity and band-to-band isolation of the latter one are better than those of the former one. For demonstration, these two filters are fabricated and measured, and the measured results show good agreement with the simulated ones.

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Wideband Dual-Mode Microstrip Filter Using Short-Ended Resonator With Centrally Loaded Inductive Stub

Cited by 30 publications

References 19 publications

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

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

Dual-Band Bandpass Filter With Wide Upper Stopband Using Novel Stepped Impedance Stub-Loaded Quad-Mode Resonator

A Novel Quad-Mode Resonator and Its Application to Dual-Band Bandpass Filters

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