Compact quadruple‐mode resonator for wideband bandpass filter design

Lee, Ker Chia; Su, Hieng Tiong; Haldar, Manas K.

doi:10.1049/iet-map.2013.0021

Cited by 7 publications

(5 citation statements)

References 13 publications

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“…The coupled-line BPF with wide bandwidth based on ring structures with transmission line was reported in [10,21,23], which results in less than 20% FBW. In [18], the filter achieved higher bandwidth of up to 49% FBW with an average IL around 1 dB, and the final dimension size is about 28 mm 2 . The square structures used in the coupledline filter designs in both [18,21] demonstrate the benefit to the overall performance of the filter in terms of compact size and low attenuation loss, S 12 .…”

Section: Comparisons Of Coupled Line Type Filters Designmentioning

confidence: 99%

“…In [18], the filter achieved higher bandwidth of up to 49% FBW with an average IL around 1 dB, and the final dimension size is about 28 mm 2 . The square structures used in the coupledline filter designs in both [18,21] demonstrate the benefit to the overall performance of the filter in terms of compact size and low attenuation loss, S 12 . However, this approach does not represent any advantage in terms of filter selectivity and the bandwidth of the electrical performance, although the filter satisfied the required rejection level of more than 20 dB.…”

Section: Comparisons Of Coupled Line Type Filters Designmentioning

confidence: 99%

“…The achievable filter bandwidth also depends on the number of coupling levels of the lines used in the topology [16]. The size of the coupled-line gap is crucial in deciding the filter response characteristics, and this reliance on coupled-line gaps increases the complexity of realizing these designs [17,18]. Therefore, it is crucial to solve the issue using a design that could reduce the complexity while having the high selective aspect of a filter.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis design of dual‐path coupled line circular ring resonator filter with tunable characteristic impedances and transmission zeros

Nordin

Hairuddin

Ashar

et al. 2021

IET Microwaves Antenna & Prop

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A dual-path coupled-line circular ring resonator filter synthesis is presented. The topology comprises identical coupled lines in series duplicated to form dual-path coupled-line interconnections. A bandpass response of n th order equal to (n/2) + 1, corresponds to controllable transmission zeros (TZs) found on both sides of the passband by varying the values of the even-and odd-mode impedances of the coupled lines, denoted Z oe and Z oo , respectively. Concerning the efficiency of controllable electrical characteristics of the resonator filter, such as in-band matching level, high selective response, and wide bandwidth, and fixing the position of the TZ frequencies, the proposed method using asymmetrical quarter-wavelength coupled lines in a circular ring resonator filter is superior to existing methods. Ultimately, the proposed bandpass filter is implemented on contrast dielectric substrate FR-4 and Taconic TRF-45 substrates using a planar form of microstrip technology to verify the synthesis equation. The measurement results indicate that the filter achieved more than 40% fractional bandwidth with excellent in-band matching levels and a controllable filter order. Both measurement and simulation results are in good agreement regarding return and insertion loss values, thus validating the proposed designs.This is an open access article under the terms of the Creative Commons Attribution-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited and no modifications or adaptations are made.

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Section: Comparisons Of Coupled Line Type Filters Designmentioning

confidence: 99%

Section: Comparisons Of Coupled Line Type Filters Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis design of dual‐path coupled line circular ring resonator filter with tunable characteristic impedances and transmission zeros

Nordin

Hairuddin

Ashar

et al. 2021

IET Microwaves Antenna & Prop

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“…The triple-mode BPFs reported in [9][10][11] have fabrication difficulties as they use via hole for grounding. Quadraple mode resonators have been used to design wideband filters in [12], [13]. Even through these filters provide wide bandwidth but have less frequency selective passband due to absence of transmission zeros at the passband edges.…”

Section: Introductionmentioning

confidence: 99%

Quasistatic Resonators Based Triple-Mode Notched Microstrip Bandpass Filter

Hugar¹,

Baligar²,

Dakulagi³

et al. 2023

RADIOENGINEERING

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This article discusses new approach for design and development of triple-mode notched microstrip bandpass filter based on quasistatic resonators (QR). The proposed approach is composed of two quasistatic resonant elements; Horizontal Plane Split Ring Resonator (HP-SRR), Vertical Plane Split Ring Resonator (VP-SRR) and a single Asymmetric Step Impedance Resonator (A-SIR)with parallel coupled feed structure. An additional attenuation pole realized by VP-SRR in desired passband tunes the dual-mode response to triple mode and enhances the 3dB bandwidth without changing the dimensions of basic the filter cell. The HP-SRR realizes a notch at WiMAX band (IEEE 802.11a lower band) in the desired passband. Further by changing the impedance of VP-SRR and HP-SRR both the location of additional attenuation pole frequency and notch band can be controlled. The proposed approach eliminates conventional method of realizing notch in the desired passband using vias and defective ground structures which have practical difficulties in realization and also the proposed approach results in compact notched wideband filter design.

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“…Recently, microstrip tri-mode/multi-mode bandpass filters (BPFs) have been extremely attractive due to their advantages of the compact overall sizes and high performance [10][11][12][13][14][15][16][17]. By etching two pairs of rectangular slots on a circular patch resonator to split a pair of fundamental degenerate modes and perturb a third mode, a tri-mode bandpass filter was proposed in [13].…”

Section: Introductionmentioning

confidence: 99%

Microstrip Tri-Mode Bandpass Filters Using Modified Ring Resonators

Xu¹,

Zhang²,

Jiang³

et al. 2015

PIER C

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Abstract-Two new microstrip tri-mode modified ring resonators (Resonator A and Resonator B) are presented and discussed through mode analysis method. The characteristic difference between these two resonators is that the center frequency of the tri-mode Resonator B is still the same as that of traditional dual-mode ring resonator, while the center frequency of Resonator A will be shifted up compared with that of traditional ring resonator. Based on these two novel resonators, two bandpass filter examples are designed, fabricated and measured. The simulations and measurements are in good agreement which validate the design ideas.

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Compact quadruple‐mode resonator for wideband bandpass filter design

Cited by 7 publications

References 13 publications

Synthesis design of dual‐path coupled line circular ring resonator filter with tunable characteristic impedances and transmission zeros

Synthesis design of dual‐path coupled line circular ring resonator filter with tunable characteristic impedances and transmission zeros

Quasistatic Resonators Based Triple-Mode Notched Microstrip Bandpass Filter

Microstrip Tri-Mode Bandpass Filters Using Modified Ring Resonators

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