Design of Dual-Band Bandpass Filter With Closely Spaced Passbands and Multiple Transmission Zeros

Xiong, Yi; Wang, Li Tian; Zhang, Wei; Zhang, Fan; Pang, Doudou; He, Ming; Zhao, Xinjie; Ji, Lu

doi:10.2528/pierl17062801

Cited by 7 publications

(15 citation statements)

References 10 publications

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“…As compared with, the proposed dual‐band bandpass filter has advantages in terms of center frequency ratios, out‐band suppression, insertion losses and overall circuit size. Although the filter in has very close passbands, it has very high insertion losses, large circuit size and poor out‐band suppression performance. Moreover, dual‐band bandpass filter in has greater center frequency ratio, poor out‐band suppression performance and overall circuit size as compared with the filter in this study.…”

Section: Resultsmentioning

confidence: 86%

“…In other words, while the first passband is formed by the first resonance frequencies, the second passband can be created by the second resonance frequencies. Multi‐mode resonators are one of the major design topologies in multi‐band bandpass filters since they can allow multiple passband generation by means of their multiple resonance behaviors . In addition, complementary split ring resonators (CSRRs) have also been used in dual‐band filter design by means of substrate integrated waveguide structures and stub loading elements .…”

Section: Introductionmentioning

confidence: 99%

“…In addition, complementary split ring resonators (CSRRs) have also been used in dual‐band filter design by means of substrate integrated waveguide structures and stub loading elements . Although there are many dual‐band bandpass filter studies in the literature, number of works for dual‐band filters with closely spaced passbands and good out‐band suppression performance is quite low …”

Section: Introductionmentioning

confidence: 99%

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A novel dual-band bandpass filter using co-directional split ring resonators with closely spaced passbands and wide upper stopband

Görür¹

2017

Int J RF Microw Comput Aided Eng

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In this article, interdigital capacitor loaded co‐directional split ring resonators (CDSRRs) and their dual‐band bandpass filter applications are proposed. The proposed resonator is formed by nested open loop resonators having open ends at the same place unlike conventional split ring resonators (SRRs). In addition, the inner open loop resonator has interdigital capacitor located between the open ends. The proposed resonator exhibits dual resonance behavior with a small center frequency ratio. Both of resonance frequencies can be controlled due to the changes in the interdigital capacitor and the electrical length of the outer resonator. A dual‐band microstrip bandpass filter is designed by using the proposed CDSRR. Two CDSRRs are used to obtain two poles in each passband. Overall electrical length of the designed filter is 0.23 λg × 0.14 λg (0.0329 λg2), where λg is the guided wavelength for the used substrate at the lowest passband center frequency of 1.8 GHz. A small center frequency is obtained by adjusting the second passband at 2.27 GHz. A very wide upper stopband, closely spaced passbands, low insertion losses and high selectivity at both passbands can be obtained by means of the proposed structure. The designed filter was also fabricated and tested. The measured results show a very good agreement with the predicted results.

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Section: Resultsmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A novel dual-band bandpass filter using co-directional split ring resonators with closely spaced passbands and wide upper stopband

Görür¹

2017

Int J RF Microw Comput Aided Eng

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“…In recent years, multi-band bandpass filters (BPFs) have attracted much interest. For example, various excellent works that focused mainly on multi-band and high selectivity have been reported [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. In [1][2][3][4][5], stepimpedance resonators are widely employed to design dualband, tri-band, and quad-band BPFs.…”

Section: Introductionmentioning

confidence: 99%

“…In [10,11], the concept of signal multipath transmission is used to design high-performance tri-band BPFs. Owing to the merits of their simple structure and controllable resonant frequencies, multiple-mode resonators (MMRs) are also widely used to design multi-band BPFs [12][13][14][15][16][17][18]. In [12], a very closely spaced passband and highly selective dual-band BPF are developed using MMR.…”

Section: Introductionmentioning

confidence: 99%

Compact tri‐wideband bandpass filter with multiple transmission zeros

Xiong¹,

Wang²,

Gong

et al. 2018

ETRI Journal

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This paper presents a tri‐wideband bandpass filter (TWB‐BPF) with compact size, high band‐to‐band isolation, and multiple transmission zeros (TZs). The proposed TWB‐BPF is based on a multiple‐mode resonator (MMR), which is interpreted by the method of the even‐ and odd‐mode analysis technique. The MMR can excite 11 resonant modes, where the first two modes comprise the first passband, the next four modes form the second passband, and the last five modes are used to generate the third passband. In addition, 10 TZs are yielded to obtain high band‐to‐band isolation and wide stopband suppression characteristics up to 14.95fc1 (fc1 is the center frequency of the first passband). To verify the proposed filter, a TWB‐BPF with 3‐dB fractional bandwidths (FBWs) of 37.4%, 43.5%, and 40.4% is designed, fabricated, and measured.

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Compact dual‐band bandpass filter with high‐passband isolation using coupled lines and open stub

Kishore

Arora

Kumar

et al. 2021

Micro & Optical Tech Letters

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This article presents the design and analysis of a compact dual‐band bandpass filter employing coupled lines and open circuit stub. The filter frequency response contains two passbands with good isolation between them and five transmission zeros in the stopband. The analytical design equations for transmission zero frequencies are obtained based on lossless transmission line theory and the even and odd mode analysis method. A dual‐band bandpass filter operating at GSM (0.9 GHz) and Wi‐Fi (2.4 GHz) frequencies is designed, fabricated, and tested. The proposed design method is verified by the excellent agreement between the simulated and measured results.

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Design of Dual-Band Bandpass Filter With Closely Spaced Passbands and Multiple Transmission Zeros

Cited by 7 publications

References 10 publications

A novel dual-band bandpass filter using co-directional split ring resonators with closely spaced passbands and wide upper stopband

A novel dual-band bandpass filter using co-directional split ring resonators with closely spaced passbands and wide upper stopband

Compact tri‐wideband bandpass filter with multiple transmission zeros

Compact dual‐band bandpass filter with high‐passband isolation using coupled lines and open stub

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