A modified design approach for compact ultra-wideband microstrip filters

Mokhtaari, Marjan; Børnemann, Jens; Amari, S.

doi:10.1002/mmce.20407

Cited by 7 publications

(7 citation statements)

References 27 publications

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“…UWB [2,3] and notched filters [4] with multiple-mode resonator (MMR) can generate multiple transmission poles in the band to enhance circuit coupling, while the high fabricated precision of 0.05 mm is hard to realize [2,4]. Other filters with defected ground structure (DGS) [5,6] and triangular ring loaded stub resonator (TRLSR) [7] have a very narrow notched band, but they are not suitable for eliminating all WLAN signals in 5-6 GHz.…”

Section: Introductionmentioning

confidence: 99%

Design of a Novel Multi-Layer Wideband Bandpass Filter With a Notched Band

Ji¹,

Ji²,

Feng³

et al. 2019

PIER Letters

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A wideband filter with a notched band is presented. The proposed filter is formed by cascading three coupling units, and each coupling unit is composed of two curved T-shaped microstrip patches at the top and bottom layers and a circular coupling slot at the mid layer. Overlapping three coupling units could result in a wideband filter with a tunable notched band. To analyse the resonance characteristics, the equivalent circuit model is presented. The notched frequency is 5.8 GHz, and within the passband, the insertion and return losses are better than −2 dB and −15 dB, respectively. The group delays are 0.08 ns and 0.12 ns correspondingly, and the upper stopband reaches 15 GHz. The multi-layer structure leads to a compact size and tight coupling characteristics, and the feasibility and excellent performance of the design is verified.

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Section: Introductionmentioning

confidence: 99%

Design of a Novel Multi-Layer Wideband Bandpass Filter With a Notched Band

Ji¹,

Ji²,

Feng³

et al. 2019

PIER Letters

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show abstract

“…The filter has compact size of (13 mm

\times 8.5 normalm normalm true)

but each shunted stubs need to connect to the ground plane through vias which increases the fabrication complexity and also lead to expensive backside processing. The UWB bandpass filter reported in has used a compact stepped‐impedance resonator composed of parallel high impedance and folded low impedance segments. Though the structure has eliminated the traditional need of small gaps in coupled‐line sections, but on the cost of increased size of (

28 normalm normalm \times 15 normalm normalm true) .

The UWB bandpass filter in has used only a single cell of composite right‐/left‐handed (CRLH) structure.…”

Section: Introductionmentioning

confidence: 99%

A compact UWB bandpass filter based on CRLH via‐less CPW‐fed

Nilotpal

Upadhyay

2015

Micro & Optical Tech Letters

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A novel compact coplanar waveguide (CPW)‐fed ultrawideband (UWB) bandpass filter is proposed in this article. The composite right‐/left‐handed transmission line structure is designed on a single layer via‐less CPW‐fed, which reduces the fabrication complexity and makes the structure more feasible. The filter exhibits stopband rejection level greater than 10 dB while maintaining insertion loss less than 0.3 dB throughout the passband range. The filter has a compact size of 18.4 mm × 4.5 mm. The performance of the proposed UWB bandpass filter is compared with the previously reported UWB bandpass filters. All the performance parameters of the filter are evaluated by full‐wave electromagnetic simulator IE3D, based on the method of moments and all the results are verified by measurement. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:276–279, 2016

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“…However, it is not easy to effectively set up a frequencydomain model to obtain a fast solution with underlining physics for coupled-microstrip lines. For example, in [10][11][12][13][14][15][16][17][18][19][20][21] filter designs are only carried out using full-wave simulations. Full-wave simulations, based on numerical methods such as the method of moments, the finite-difference time-domain method, or the finite-element method, in general, meet the requirement of accuracy, but cannot provide the detailed information for in-depth understanding of the physical mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the research on dual-mode microstrip filters has increased, since a single dual-mode resonator can act as a doubly tuned resonance circuit, and hence the number of resonators required for a prescribed filter degree can be reduced, resulting in a more compact filter structure. To reduce their insertion loss, due to radiation, these filters are designed by side-to-side coupling, instead of end-to-end coupling [10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Quasi-TEM approach of coupled-microstrip lines and its application to the analysis of microstrip filters

Xiao

Norgren

2011

Int J RF and Microwave Comp Aid Eng

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In this article, the quasi-TEM approach is successfully used to analyze coupled-microstrip lines of finite length, which are usually used for the coupling between the source/load and resonators in microstrip filters. First, an orthogonal expansion method is used to extract the per-length inductance and capacitance matrices. The authors then obtain the impedance matrix or admittance matrix, which relates the voltages and currents at both ends of coupled-microstrip lines. To verify our theory, an example is presented, i.e., a Y-shaped dual-mode bandpass microstrip filter, for which, the equivalent circuit model based on the quasi-TEM analysis of coupled-microstrip lines is accurately set up. The approach in this article is applicable to planar microstrip lines with arbitrary number of conductors, under the quasi-TEM assumption. V C 2011 Wiley Periodicals, Inc. Int J RF and Microwave CAE 22:131-139, 2012.

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A modified design approach for compact ultra-wideband microstrip filters

Cited by 7 publications

References 27 publications

Design of a Novel Multi-Layer Wideband Bandpass Filter With a Notched Band

Design of a Novel Multi-Layer Wideband Bandpass Filter With a Notched Band

A compact UWB bandpass filter based on CRLH via‐less CPW‐fed

Quasi-TEM approach of coupled-microstrip lines and its application to the analysis of microstrip filters

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