Compact, Broad-Stopband Lowpass Filters Using Sirs-Loaded Circular Hairpin Resonators

Yang, Maolin; Xu, Jun; Qing, Zhao; Lin, Peng; Li, Guiping

doi:10.2528/pier09120901

Cited by 48 publications

(44 citation statements)

References 26 publications

(26 reference statements)

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“…Another method is to use the two-path approach [4][5][6][7][8][9][10][11][12]. The two-path microstripline bandpass filter consists of hairpin resonators with asymmetric tapped feed lines [4,5]. These asymmetric tapped feeding lines were also used with a stepped impedance resonator in a bandpass filter [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Numerous bandpass filters, adopting different approaches to produce transmission zeros at the lower and upper stopbands have been reported in [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. A straightforward way to produce two transmission zeros is to use two shunt open-circuited stubs of different lengths [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…A straightforward way to produce two transmission zeros is to use two shunt open-circuited stubs of different lengths [1][2][3][4]. Another method is to use the two-path approach [4][5][6][7][8][9][10][11][12]. The two-path microstripline bandpass filter consists of hairpin resonators with asymmetric tapped feed lines [4,5].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

Wong¹,

Wang²,

Chen³

et al. 2013

PIER

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Abstract-A rotationally symmetric short-circuited stub-loaded structure is proposed to design a microstrip-line bandpass filter with two transmission zeros near the lower and upper cut-off frequency edges of operating millimeter-wave bands. Furthermore, interdigital coupled-lines and additional resonators are integrated into the proposed rotationally symmetric bandpass filter to improve the out-of-band rejection. As design examples, the in-band and out-of-band performances of two filter prototypes using single layer microstrip-lines are designed and experimentally examined. The measured results show that the filter without any interdigital coupledlines achieves a passband insertion loss of 0.97 dB at 40 GHz and out-ofband rejection of larger than 23 dB, while the filter with the interdigital coupled-lines realizes the suppressions in lower and upper-bands of, respectively, larger than 30 dB and 19 dB for the overall insertion loss of 2.1 dB at 40 GHz.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

Wong¹,

Wang²,

Chen³

et al. 2013

PIER

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“…In [3,4], dual-mode stripline ring resonators and folded coupled-line structure are employed to produce transmission zeros to improve the selectivity of the diplexer. Microstrip diplexers and filters were realized based on modified stepped-impedance resonators [5,6], dual-mode stepped-impedance resonators [7] and defected ground structure [8,9] to achieve good selectivity, high isolation and wide stopband. In [10], a diplexer was proposed by utilizing common resonator sections.…”

Section: Introductionmentioning

confidence: 99%

“…So far, a variety of configurations were proposed to implement diplexers [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. A well designed diplexer should have compact circuit size, low cost and high performance.…”

Section: Introductionmentioning

confidence: 99%

Design of Compact Quad-Channel Diplexer Using Quad-Mode Stub-Loaded Resonators

Lin¹,

Zhao²,

Wu³

et al. 2015

PIER Letters

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Abstract-In this paper, a compact quad-channel diplexer utilizing quad-mode stub-loaded resonators (QMSLRs) is proposed. The proposed quad-channel diplexer is composed of two dual-band bandpass filters (BPFs) based on QMSLRs and source-load coupling lines. Due to the symmetry of the proposed quad-mode resonator, its resonance characteristics are analyzed by using the even-odd-mode method twice. All four modes equivalent circuits of the resonator are quarter wavelength resonators, so the circuit size can be very compact, and the first resonance frequencies is three times of the fundamental ones. Stub-to-stub coupling is introduced to split two identical resonance modes, which is in favor of implementing dual-band BPF by using a single quad-mode resonator. By tuning the corresponding physical dimensions of the stubs, the resonant modes can be individually adjusted. The source-load coupling lines are properly designed to provide appropriate external coupling for the passbands and high isolation level between channels. For demonstration, a quad-channel diplexer (0.9/1.2 GHz at Load 1 and 1.5/1.8 GHz at Load 2) using the quad-mode resonator is designed, fabricated and measured. The simulated and measured results with good agreement are presented.

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Compact lowpass filter with high suppression level and wide stopband using stepped impedance m‐shape units

Yang

Zhang

et al. 2014

Micro & Optical Tech Letters

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A lowpass filter (LPF) with high suppression level and wide stopband using novel stepped-impedance m-shape unit is presented. The low impedance section of center-loaded stepped-impedance resonator is implemented using T-shape open stub with three arms, which improve design freedom and reduce size simultaneously. The mechanism for rejection level and stopband width is analyzed based on one stepped-impedance m-shape unit. The implemented filter composed with three different unit exhibits 40-dB rejection from 1.4 f c to 7.2 f c , where f c is 3-dB cutoff frequency. The compact size of the cascaded LPF is as small as 0.25 k g 3 0.08 k g , where k g is guided wavelength at cutoff frequency. The measured results show good agreement according with simulated ones. V C 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56: [2947][2948][2949][2950] 2014; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.28744Key words: lowpass filter; high suppression level; stepped impedance resonator INTRODUCTIONThe lowpass filters (LPFs) with good in-band and out-of-bandrejection performance play significant roles in modern microwave communication system. Many efforts have been explored to improve the performance of LPF, such as wide stopband, high selectivity or compact size during the last few years. One of the most effective design methods of the LPF is using hairpin unit. Hsieh and Chang [1] have proposed stepped-impedance hairpin resonator unit to form a compact LPF with sharp cutoff frequency response. An elliptic-function LPF with wide stopband and high rejection level was achieved by cascading multiple stepped-impedance hairpin units with different size [2]. Unfortunately, it enlarges the overall circuit size due to the multisection cascading. In [3], ground aperture was introduced to stepped-impedance hairpin resonator LPF to provide wide stopband and small size. But it suffers from electromagnetic energy leakage. The stopband can be extended by imbedding a pair of coupled stepped-impedance resonator (SIR) in steppedimpedance hairpin unit without changing size [4]. However, it worsens the passband flatness and is unable to improve suppression level characteristic. An interdigital structure [5] was imbedded to the low impedance section of stepped-impedance hairpin unit, which can be used for tuning of transition characteristic, suppression level, and stopband width. But only one parameter cannot achieve a good balance between these performances. The coupled-line hairpin unit [6] produces three transmission zeros in stopband via tight coupling with very compact size. The width of stopband can be extended by cascading the units with different size or loading open stubs at the feed points [7]. Sharp stopband transition was obtained when center-loaded stubs were introduced, however, its lower suppression level cannot meet out-of-band-rejection requirement.In this letter, a compact LPF with wide stopband and high suppression level is achieved with a novel application of SIR at the center of the steppe...

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Compact, Broad-Stopband Lowpass Filters Using Sirs-Loaded Circular Hairpin Resonators

Cited by 48 publications

References 26 publications

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

Rotationally Symmetric Coupled-Lines Bandpass Filter With Two Transmission Zeros

Design of Compact Quad-Channel Diplexer Using Quad-Mode Stub-Loaded Resonators

Compact lowpass filter with high suppression level and wide stopband using stepped impedance m‐shape units

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