Ultra-wideband bandpass filter using CPW-to-microstrip coupling structure

Hu, Haifeng; Huang, Xiaodong; Cheng, Chen

doi:10.1049/el:20060789

Cited by 50 publications

(27 citation statements)

References 3 publications

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“…The proposed filter has almost the same filtering performance as the one using interdigital coupled-line and MMR in [2], but the proposed UWB filter has a wider bandpass width with a size reduction of 61.54%, compared with the one in [2]. In addition, the selectivity (skirt factor) is optimized from 50% to 92%, and the fractional passband width is raised from 95% to 133% compared with the former UWB BPF in [8].…”

Section: Resultsmentioning

confidence: 90%

“…In recent years, several methods and structures have been proposed to implement UWB bandpass filter (BPF) with compact size, sharp roll-off, low insertion loss and wide bandwidth [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Among the reported UWB BPFs, the interdigital coupled-line, which can create a UWB bandpass response and the multi-mode resonators (MMR) are the most widely used structures [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, several other UWB BPFs have been reported based on the hybrid structures. For example, CPW-to-microstrip transitions structures [8,10] and microstrip-to-CPW transition structures [11,12] have been used to design UWB BPFs. In these filters, their main structures are microstrip-CPW or CPW-microstrip transition.…”

Section: Introductionmentioning

confidence: 99%

“…1. The basic structure is a back-to-back microstrip-CPW transition structure reported in [8], which can create a UWB bandpass response. In this work, to obtain a UWB BPF with good out-of-band performances, some other structures are used.…”

Section: Introductionmentioning

confidence: 99%

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A Compact Ultra-Wideband Bandpass Filter With Sharp Roll-Off Based on CPW-to-Microstrip Coupling Structure

Wang¹,

Chun-hui²,

Xia³

et al. 2017

PIER Letters

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Abstract-In this paper, a compact ultra-wideband bandpass filter using a back to back Coplanar Waveguide (CPW)-to-microstrip transition structure is proposed. Compared with traditional ultrawideband bandpass filters using hybrid structures, the proposed filter has a sharper selectivity because of two transmission zeros located at the lower and upper edges of the passband, respectively, generated by a modified T-shaped stub. Moreover, to further improve its out-of-band performance open stubs are introduced to produce extra transmission zeros at high frequency. A prototype of the proposed filter is fabricated and measured. The results show that the proposed filter achieves a bandwidth of 133% from 2.4 to 11.9 GHz, and the selectivity (skirt factor) is optimized from 50% to 92% compared to a former ultra-wideband (UWB) bandpass filter (BPF) with a similar structure. Besides, the proposed filter can offer some other advantages such as good return loss, low insertion loss, stable group delay, and compact size (16 × 7.55 mm 2 ). This filter can be a good candidate for UWB applications.

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Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Compact Ultra-Wideband Bandpass Filter With Sharp Roll-Off Based on CPW-to-Microstrip Coupling Structure

Wang¹,

Chun-hui²,

Xia³

et al. 2017

PIER Letters

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“…Several experiments, methods and techniques had been studied purposely to expand the bandwidth of bandpass filters in the past decade. Some of them were employing methods from dielectric filled waveguides, trisection substrate-integrated waveguide, resonators, coplanar waveguide, quarter-wavelength short-circuited stubs and/or open-circuited stubs, and hairpin [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Novel Compact Microstrip Ultra-Wideband Filter Utilizing Short-Circuited Stubs With Less Vias

Razalli¹,

Ismail²,

Mahdi³

et al. 2008

PIER

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Abstract-We present here a new pattern with compact size of Ultra Wideband (UWB) microwave filter. The filter is based on quarter-wave length short-circuited stubs model. We introduced here a new schematic model by extracting all parasitic elements such as Tjunction and discontinuity in our new pattern of UWB filter. This new filter has minimal number of vias and improved frequency bandwidth, insertion loss and return loss. It is fabricated on RT Duroid 5880 with 0.508 mm of substrate thickness. The final dimension is measured as 21 mm × 14 mm. It is not only compact, but also delivers excellent scattering parameters with magnitude of insertion loss, |S 21 | lower than 0.85 dB and return loss better than −11.6 dB. The fractional bandwidth is 109% from 3.06 GHz to 10.43 GHz. In the pass band, the measured group delay varies in between 0.47 ns to 0.32 ns, showing stability with minimum variation of only 0.15 ns. † The first author is also with School of Computer and Communication Engineering,

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Ultra‐Wideband (UWB) Filters

Hong¹

2011

Microstrip Filters for RF/Microwave Applications

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Ultra-wideband bandpass filter using CPW-to-microstrip coupling structure

Cited by 50 publications

References 3 publications

A Compact Ultra-Wideband Bandpass Filter With Sharp Roll-Off Based on CPW-to-Microstrip Coupling Structure

A Compact Ultra-Wideband Bandpass Filter With Sharp Roll-Off Based on CPW-to-Microstrip Coupling Structure

Novel Compact Microstrip Ultra-Wideband Filter Utilizing Short-Circuited Stubs With Less Vias

Ultra‐Wideband (UWB) Filters

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