Method of determining feed positions in coupled half-wavelength stepped impedance resonator bandpass filter

Ma, Runbo; Han, Guorui; Chen, X.; Li, L.; Han, Lu; Zhang, W.

doi:10.1049/iet-map.2008.0237

Cited by 12 publications

(5 citation statements)

References 12 publications

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“…A half‐wavelength stepped impedance resonator (SIR) bandpass filter [13], shown in Figure 1, is considered. The EM simulations are carried out in FEKO [14] for both the high‐fidelity model R f (total mesh number is 1090, simulation time 22 min) and the low‐fidelity model R c (total mesh number 128, simulation time 30 s).…”

Section: Design Examplesmentioning

confidence: 99%

Robust variable‐fidelity optimization of microwave filters using co‐Kriging and trust regions

Koziel

Leifsson

Couckuyt

et al. 2013

Micro & Optical Tech Letters

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This work introduces a variable-fidelity optimization methodology for simulation-driven design optimization of filters. Our approach is based on electromagnetic (EM) simulations of different accuracy controlled by the mesh density. A Kriging interpolation model (the surrogate) is created using sampled low-fidelity EM data and optimized to approximately locate the optimum of the high-fidelity EM model of the filter. This initial surrogate is subsequently improved by blending in the high-fidelity data accumulated during the optimization process using the co-Kriging technique. The algorithm convergence is ensured by embedding it into the trust region framework. The operation and performance of our method is demonstrated using three filter design cases. V C 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55: [765][766][767][768][769] 2013; View this article online at wileyonlinelibrary.com.

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Section: Design Examplesmentioning

confidence: 99%

Robust variable‐fidelity optimization of microwave filters using co‐Kriging and trust regions

Koziel

Leifsson

Couckuyt

et al. 2013

Micro & Optical Tech Letters

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“…The bandwidth could not be increased, because it depends on periodic transmission zeros of open‐circuited stubs. In [7], a coupled half‐wavelength stepped‐impedance resonator BPF is introduced. The filter response is highly selective but it has a narrow bandwidth.…”

Section: Introductionmentioning

confidence: 99%

Highly selective wideband bandpass filter using combined microstrip/coplanar waveguide structure

et al. 2016

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A highly selective wideband bandpass filter using a combined coplanar waveguide (CPW) and microstrip structure is proposed. The CPW section is responsible for creating a 4–8 GHz bandwidth. The microstrip split ring resonators and shorted coupled lines are used to sharpen the transitions between the passband and the stopband at lower and upper edges. The CPW section is fed by a microstrip host line and consists of two symmetrical coupled stepped‐impedance resonators to limit the bandwidth of the desired filter. A lumped element circuit model is presented and comparisons with experimental and simulation results confirm great compatibility and performance. The measurement results confirm a return loss larger than 15.3 dB in the passband, an out‐of‐band rejection greater than 15 dB.

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“…Over the past 30 years, the structure of parallel coupled lines has been widely used in band-pass filter (BPF) due to its ease of synthesis method, but, the conventional parallel coupled BPF has the drawback of a large circuit area and spurious responses at twice the passband frequency [7]. In order to improve the performance of filters with coupled lines, anti-parallel coupled-line has been adopted in implementing filters [8][9][10][11][12][13]. However, some blemishes still present in these filters.…”

Section: Introductionmentioning

confidence: 99%

“…However, some blemishes still present in these filters. For example, in [10], even though it has a compact size, the rejection of lower stop-band is not satisfying. In [11], anti-parallel coupled-line with a termination is used to design a band-pass filter; it has smaller size and three transmission zeros out of passband, whereas it does not perform excellently at spurious passband (twice the passband frequency).…”

Section: Introductionmentioning

confidence: 99%

A Quasi-Elliptic Microstrip Bandpass Filter Using Modified Anti-Parallel Coupled-Line

Wang¹,

Jin²

2013

PIER

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Abstract-A novel band-pass filter (BPF) with lower and upper stopband zeros is proposed.The filter mainly consists of two antisymmetric modified anti-parallel coupled-lines and double pairs of transmission lines. Compared with the traditional anti-parallel coupled-line, the new filter has a better performance at both pass band and stop band. On the basis of even-odd mode method and network theory, the filter has been analyzed in detail. In addition, a simple method to create transmission zeros is investigated, which is beneficial for controlling the stopband zeros. The proposed filter is implemented on RT/Duroid 4350 substrate. Measured results show low insertion loss of less than 1.6 dB in the pass band and good suppressing of more than 22 dB in the lower stop band. Measured results show a good agreement with simulated results.

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Method of determining feed positions in coupled half-wavelength stepped impedance resonator bandpass filter

Cited by 12 publications

References 12 publications

Robust variable‐fidelity optimization of microwave filters using co‐Kriging and trust regions

Robust variable‐fidelity optimization of microwave filters using co‐Kriging and trust regions

Highly selective wideband bandpass filter using combined microstrip/coplanar waveguide structure

A Quasi-Elliptic Microstrip Bandpass Filter Using Modified Anti-Parallel Coupled-Line

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