A Simple Planar Dual-Band Bandpass Filter With Multiple Transmission Poles and Zeros

Wu, Yongle; Cui, Liwei; Zhuang, Zheng; Wang, Weimin; Liu, Yuanan

doi:10.1109/tcsii.2017.2702191

Cited by 75 publications

(34 citation statements)

References 17 publications

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“…With the calculated circuit parameters (y 1 ; y 2 ; y 3 ; y s ) from (22), the proposed BPF will surely have equiripple response in magnitude with designated bandwidth and ripple factor. In examining Figure 4 carefully, the five ripples in band are located at 2x c ; 2x m ; 0; x m ; and x c , respectively.…”

Section: E Qui Ri P P Le In M Ag Ni Tudementioning

confidence: 99%

“…In our experience, the initial value of x m can be set to about 0.6x c , then a parametric sweep can be employed to demonstrate the filter performances, e.g., group delay and (out-band) S 21 . The circuit parameters (y 1 ; y 2 ; y 3 ; y s ) can be solved from (22), via numerical solvers such as Matlab. When all the admittances are obtained, the filter performances can be calculated directly from (6) or simulated by using a commercial simulator such as ADS.…”

Section: E Qui Ri P P Le In G Rou P D Ela Ymentioning

confidence: 99%

See 1 more Smart Citation

Stub-loaded square loop bandpass filter with equiripple response in both delay and magnitude

Jin

Huang

Chen

et al. 2018

Int J RF Microw Comput Aided Eng

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It is shown that a stub loaded square loop filter, composed of six sections of commensurate transmission line, can achieve equiripple response in both magnitude and group delay simultaneously, when the admittances of the lines are properly chosen. Design formulas are given to calculate the admittances by given specifications such as fractional bandwidth and in‐band magnitude ripple. An interesting property of this filter is that the group delay can be adjusted while the in‐band magnitude response keeps almost unchanged. For verification, a filter sample is designed, fabricated and measured. In experiment, it exhibits a delay variation of 0.22 ns and minimal insertion loss of 0.21 dB within its passband (|S11| < −13.8 dB) from 0.48 to 1.52 GHz, which agree well with the theoretical predictions.

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Section: E Qui Ri P P Le In M Ag Ni Tudementioning

confidence: 99%

Section: E Qui Ri P P Le In G Rou P D Ela Ymentioning

confidence: 99%

Stub-loaded square loop bandpass filter with equiripple response in both delay and magnitude

Jin

Huang

Chen

et al. 2018

Int J RF Microw Comput Aided Eng

View full text Add to dashboard Cite

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“…In [2] and [3], three pairs of coupled lines are connected each other without additional stubs for the design of single-ended narrowband and wideband BPFs, respectively, with multiple transmission poles (TPs) and TZs. Also, the loaded stubs and coupled lines can be simultaneously employed to design sharp roll-off BPFs [4]- [6]. In [4], a dual-band BPF prototype using threesection coupled lines and three shorted stubs is designed.…”

Section: Introductionmentioning

confidence: 99%

Single-Ended and Balanced Bandpass Filters Using Multiple Pairs of Coupled Lines and Stepped-Impedance Stubs

Zhang

2020

IEEE Access

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Two different types of three pairs of coupled lines (TPCL) structures with bandpass and all-stop filtering (ASF) characteristics, respectively, are proposed and analyzed through impedance matrix deduction and input admittance calculation. Combined with the stepped-impedance stubs, high-selectivity single-ended and balanced filters using TPCL structures have been presented. Five transmission poles (TPs) within the passband and six deep transmission zeros (TZs) from 0 to 2f 0 (f 0 : passband center frequency) can be realized in both of single-ended and balanced filters. For demonstration, two sharp roll-off singleended and balanced filter prototypes with good in-band characteristics (insertion losses and return losses) and high common-mode suppression are designed, whose measured 3-dB fractional bandwidths are of 35% and 34.4% (differential mode), respectively. Good agreement between the simulations and measurements validates the design concept. INDEX TERMS Bandpass filter, balanced filter, parallel coupled lines, transmission pole (TP), transmission zero (TZ).

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“…In recent times, few studies have been published for dual‐band bandpass filters (BPFs), triple‐band BPFs, quad‐band BPFs, and penta‐band BPFs . In Reference , by using short‐circuited stubs and multiple coupled poles, transmission zeros based dual‐band BPF was obtained with high selectivity. The coplanar waveguide‐based dual‐band filter has been designed using complementary split ring resonator (CSRR), in which the zeroth‐order resonance frequency was controlled by shunt parameters .…”

Section: Introductionmentioning

confidence: 99%

Compact metamaterial inspired structure with bandpass characteristics for penta‐band applications using virtual ground concept

Choudhary

Chaudhary

2019

Micro & Optical Tech Letters

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A simple and compact metamaterial inspired filter structure for penta‐band bandpass response with minimum insertion loss is proposed in this article. The designed filter structure consists of an S‐shaped ring and two sets of meander line inductors, which provides series and shunt parallel LC circuit utilizing triangular stubs. Triangular stubs are realized as virtual grounds, which give a series combination of inductance and capacitance. A penta‐band bandpass filter operates at 1.06/1.85/2.37/2.78/3.17 GHz with the corresponding 3‐dB fractional bandwidth of 56.6%, 22.2%, 11.4%, 9.0%, and 11.6%, respectively. The operating frequencies and transmission zeros can be scaled up and down by varying the physical parameters of the designed structure. The size of the filter is 0.16λg × 0.14λg (19 mm × 17 mm) at the center frequency (1.06 GHz) of the first passband. The metamaterial properties have been verified by its extracted refractive index diagram. The filter performance has been validated through electromagnetic simulation and experimental measurements.

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A Simple Planar Dual-Band Bandpass Filter With Multiple Transmission Poles and Zeros

Cited by 75 publications

References 17 publications

Stub-loaded square loop bandpass filter with equiripple response in both delay and magnitude

Stub-loaded square loop bandpass filter with equiripple response in both delay and magnitude

Single-Ended and Balanced Bandpass Filters Using Multiple Pairs of Coupled Lines and Stepped-Impedance Stubs

Compact metamaterial inspired structure with bandpass characteristics for penta‐band applications using virtual ground concept

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