A Dual-Wideband Bandpass Filter Based on E-Shaped Microstrip Sir With Improved Upper-Stopband Performance

Wu, Yanliang; Liao, Cheng; Xiong, Xinhong

doi:10.2528/pier10071802

Cited by 40 publications

(28 citation statements)

References 26 publications

(38 reference statements)

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“…For instance, stepped impedance resonators (SIRs) had been implemented to realize dual-band BPFs. The dual-band BPFs using SIRs had attractive features such as, simple and compact structure in [2,3], low insertion loss in [4], high isolation in [5]. However, independently controllable bandwidths and passband frequencies were not mentioned in these papers.…”

Section: Introductionmentioning

confidence: 99%

High-Order Dual-Band Bandpass Filter With Independently Controllable Frequencies and Bandwidths

Chu

Li²

2012

PIER C

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Abstract-A multi-stub-loaded resonator is presented in this paper. The resonators can be conveniently applied to design high-order dual-band bandpass filters (BPFs). Base on the analysis of the resonator, the first two even-mode resonant frequencies are controlled independently by the lengths of the loaded stubs. Two high-order dual-band BPFs using the first two even-mode resonant frequencies of the multi-stub-loaded resonators are proposed. The bandwidth of each passband can be adjusted independently by the coupling strength of the adjacent resonators. This paper deals with the analysis and design of the proposed high-order dual-band BPFs as well as the experimental validations of the predicted dual-band performance.

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Section: Introductionmentioning

confidence: 99%

High-Order Dual-Band Bandpass Filter With Independently Controllable Frequencies and Bandwidths

Chu

Li²

2012

PIER C

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“…However, the two passbands are also not very wide. The coupled-line resonators in [6] and E-shaped resonator in [8] are used to obtain wide dual-passband. Nevertheless, the two passbands are closely spaced.…”

Section: Introductionmentioning

confidence: 99%

Dual-Wideband Bandpass Filter Using Open and Shorted Stubs Loaded Ring Resonator

Yang¹,

Jiao²,

Zhang³

et al. 2016

PIER Letters

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Abstract-This letter presents a dual-wideband bandpass filter (BPF) by using open and shorted stubs loaded ring resonator. The resonator can excite multiple resonant modes. The transmission zeros (TZs) analyzed by the transversal signal interference concepts can divide the resonant modes into two groups that form dual-wide passband. The even-mode resonant frequencies can be controlled by the stubs parameters, and the TZs can be tuned by the port angle independently. So the center frequency (CF) and the bandwidth of each passband can be flexibly controlled. An experimental dual-wideband BPF with CF of 1.48/5.7 GHz and 3 dB FBW of 137.8%/49.3% is implemented, and the experimental results are presented for validation.

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“…Unfortunately, without special measures, most of the microstrip BPFs exhibit harmonic responses degrading the system performance. To overcome this problem, various methods have been presented in the past [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Among them, modification and perturbation to the width of the coupled-line resonators are the most widely used approach to suppress the spurious response [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…However, these filter designs only focus on the second harmonic suppression. To obtain wide-stopband, stepped-impedance resonators (SIRs) are proposed [11][12][13][14][15][16]. In [11][12][13][14][15], SIRs with high frequency ratios and proper tapping locations are utilized to obtain wide-stopband.…”

Section: Introductionmentioning

confidence: 99%

Novel Class of Microstrip Bandpass Filters With Improved Upper Rejection Band

Lu¹,

Dai

2012

PIER C

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Abstract-In this paper, we present a novel class of microstrip bandpass filters with improved upper rejection band. The proposed filters are composed of two half-wavelength resonators and two shortended microstrip feed lines for input and output. Using voltagewave analysis, we examine the resonance and coupling properties at harmonic frequencies. It is found that different combinations of the feed line and the resonator with proper selection of the coupling regions can suppress spurious responses. Benefiting from this approach, two single-band and one dual-band bandpass filters are designed, fabricated and measured. Simulated and measured results indicate that the upper rejection bands of the proposed filters are increased up to near thirdand fifth-order harmonics, respectively. And the rejection level during the stop-bands is more than 20 dB.

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A Dual-Wideband Bandpass Filter Based on E-Shaped Microstrip Sir With Improved Upper-Stopband Performance

Cited by 40 publications

References 26 publications

High-Order Dual-Band Bandpass Filter With Independently Controllable Frequencies and Bandwidths

High-Order Dual-Band Bandpass Filter With Independently Controllable Frequencies and Bandwidths

Dual-Wideband Bandpass Filter Using Open and Shorted Stubs Loaded Ring Resonator

Novel Class of Microstrip Bandpass Filters With Improved Upper Rejection Band

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