Novel Ultra-Wideband Bandpass Filter Using Shorted Coupled Lines and Transversal Transmission Line

Feng, Wenjie; Che, Wenquan

doi:10.1109/lmwc.2010.2055840

Cited by 69 publications

(67 citation statements)

References 10 publications

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“…The slight frequency discrepancies between the measured and simulated results are mainly caused by the limited fabrication precision and measurement errors. To further demonstrate the performances of the filters, the comparisons of measured results for several wideband filter structures [15][16][17][18][19][20][21] are shown in Table 1. The proposed wideband bandpass filter has more transmission zeros to further improve the passband selectivity and harmonic suppression compared with the other wideband filter structures in [15][16][17][18][19][20][21], and the upper stopband of the proposed wideband bandpass filter stretches up to 2.67f due to the multiple transmission zeros in out-of-band.…”

Section: Measured Results and Discussionmentioning

confidence: 99%

“…To further demonstrate the performances of the filters, the comparisons of measured results for several wideband filter structures [15][16][17][18][19][20][21] are shown in Table 1. The proposed wideband bandpass filter has more transmission zeros to further improve the passband selectivity and harmonic suppression compared with the other wideband filter structures in [15][16][17][18][19][20][21], and the upper stopband of the proposed wideband bandpass filter stretches up to 2.67f due to the multiple transmission zeros in out-of-band. Moreover, to extend the upper stopband, some lowpass/bandstop networks can be cascaded to further improve the upper stopband performance of the two wideband bandpass filters [9][10][11][12][13][14], and to achieve tighter coupling and wider passband for the filter, patterned ground-plane technology [21,22] can be used in the proposed wideband bandpass filter.…”

Section: Measured Results and Discussionmentioning

confidence: 99%

“…Recently, microstrip wideband bandpass filters based on transversal signal-interaction concepts have drawn a lot of attention [15][16][17][18][19][20][21]. High-selectivity filtering characteristics with only a few resonators were realized in [15,16], however, DC suppression was not solved and the circuit size should be further reduced.…”

Section: Introductionmentioning

confidence: 99%

“…The filter has high selectivity and good harmonic suppression; however, two via holes were used to realize the ideal 180 swap, causing fabrication difficulty. Moreover, two wideband bandpass filters based on the ideal 180 • phase inversion of the two shorted coupled lines were proposed in [19,20]. However, there is only one transmission zero (in the upper stopband) closed to the passband, and the 3-dB bandwidth of the filters is not easy to adjust.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Microstrip Wideband Bandpass Filter With Six Transmission Zeros Using Transversal Signal-Interaction Concepts

Xue¹,

Feng²,

Zhu³

et al. 2013

PIER C

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Abstract-A high-selectivity microstrip wideband bandpass filter with six transmission zeros using transversal signal-interaction concepts is proposed.A fifth-order wide passband with six transmission zeros (0-2f 0 , f 0 is center frequency of the passband) can be realized two transmission paths. The bandwidth and locations of the transmission zeros can be adjusted conveniently by changing the characteristic impedances of open stub and coupling coefficients of the open/shorted coupled lines. A prototype of planar wideband bandpass filter with 3-dB fractional bandwidth 43.3% (2.33-3.63 GHz) is designed and fabricated. The measured and simulated results both indicate good performances of high selectivity and wideband harmonic suppression.

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Section: Measured Results and Discussionmentioning

confidence: 99%

Section: Measured Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microstrip Wideband Bandpass Filter With Six Transmission Zeros Using Transversal Signal-Interaction Concepts

Xue¹,

Feng²,

Zhu³

et al. 2013

PIER C

Self Cite

View full text Add to dashboard Cite

show abstract

“…Recently, signal-interference techniques have drawn a lot of attention on designing wide-band filters [8][9][10] and bandstop filters [11]. With a transversal signal path, signal-interaction concept includes multiple transmission zeros to get a high selectivity.…”

Section: Introductionmentioning

confidence: 99%

A Novel Compact Tri-Band Bandpass Filter Based on Dual-Mode CRLH-Tl Resonator and Transversal Stepped-Impedance Resonator

Cao

Yi²,

Chen³

et al. 2015

PIER Letters

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Abstract-A novel compact tri-band band-pass filter (BPF) with transversal signal interaction concepts, based on composite right/left-handed transmission lines (CRLH-TLs) resonator and parallel stepped impedance resonator (SIR), is presented. The main path is based on a dual-mode CRLH-TL resonator, which exhibits the first two passbands. The secondary path is a SIR, which contributes to the third passband and generates another transmission zero between the first and second passbands simultaneously. The proposed filter has been simulated, fabricated and measured. Both the simulated and measured results show that the filter has a high selectivity with a compact size as small as 0.18λg × 0.12λg.

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Wide passband/stopband bandpass filter based on transversal signal interference concepts and modified branch-line structure

Chen

2014

Int J RF and Microwave Comp Aid Eng

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A high selectivity wide passband filter with a broader stopband based on transversal signal-interaction concepts and modified branch line structure (MBLS) is developed in this article. Two transmission paths, that is, one half-wavelength transmission line and one MBLS, are used to realize signal transmission from Port 1 to Port 2. Then, two transmission zeros are introduced at both lower and upper sides of the passband, which are used to improve the passband selectivity greatly. The filter bandwidth can be easily controlled by reasonable adjusting the coupling coefficient of the coupled lines. Furthermore, with four stubs connected at the input/output ports, the stopband attenuation level is improved greatly. Finally, one prototype filter having 69.1% of 3 dB fractional bandwidth is fabricated with advantages of sharp selectivity and high out-of-band rejection. The EM simulated and measured results are presented, and an excellent agreement can be obtained.

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Novel Ultra-Wideband Bandpass Filter Using Shorted Coupled Lines and Transversal Transmission Line

Cited by 69 publications

References 10 publications

Microstrip Wideband Bandpass Filter With Six Transmission Zeros Using Transversal Signal-Interaction Concepts

Microstrip Wideband Bandpass Filter With Six Transmission Zeros Using Transversal Signal-Interaction Concepts

A Novel Compact Tri-Band Bandpass Filter Based on Dual-Mode CRLH-Tl Resonator and Transversal Stepped-Impedance Resonator

Wide passband/stopband bandpass filter based on transversal signal interference concepts and modified branch-line structure

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