Synthesis of a Single Side Access Ring Resonator for Higher Order Bandpass Filters

Wahab, Norfishah Ab; Salleh, Mohd Khairul Mohd; Khanfar, Sameh Khamfar M.; Khan, Zuhani Ismail; Awang, Zaiki

doi:10.2528/pierl12122805

Cited by 9 publications

(4 citation statements)

References 12 publications

(20 reference statements)

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“…By doing so, higher order filters are created. The response showed the existence of transmission zeros at lower and upper side bands for high selectivity [24][25][26]. The advantage of this topology is that, transmission zeros are maintain, while increment of numbers of orders are increased by introducing more coupled lines This characteristic is important for high performance of bandpass filter especially when this filter is working at higher frequency above 10 GHz.…”

Section: Introductionmentioning

confidence: 99%

Closed-loop ring resonator topology for bandpass filter applications

Wahab

Tan

Hushim

2020

IJEECS

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This paper presents a single mode pseudo-elliptic bandpass resonator based on closed-loop ring topology. The resonator is built from six quarter wavelength transmission lines to form a square closed-loop ring structure. This structure creates transmission zeros at the lower and upper sidebands so that high selectivity bandpass filter response is achieved. The advantage of this topology is that the design is less complex since no perturbation is needed on the ring lines for creation of transmission zeros. Higher-order filters can be constructed by introducing quarter-wavelength coupled-lines, coupled at both input and output of the closed-loop ring resonator. For proof of concept, the filters are designed at 10 GHz up to 3rd order, simulated using full-wave electromagnetic simulator on microstrip substrate, FR-4 with characteristics given as Ԑr = 4.70, h = 1.499 mm and tan δ = 0.012. The filters are simulated and responses are found to be agreeable with the proposed idea.

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Section: Introductionmentioning

confidence: 99%

Closed-loop ring resonator topology for bandpass filter applications

Wahab

Tan

Hushim

2020

IJEECS

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“…Among the various designs proposed in [25], a dual‐resonance design could be proposed using perturbation elements or controlling the characteristic impedances of these elements, thus enabling global synthesis of such systems. In [26], such topologies that consisted of transmission lines had limitations in controlling filter performance in terms of TZ and frequency.…”

Section: Introductionmentioning

confidence: 99%

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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“…The conventional parallel coupled-line filter topology was introduced by Cohn [1] in 1937 and are still being used until today in modern telecommunication systems. The designs varies depending on the requirement, technology and specifications [2][3][4][5][6]. Further researches and enhancements of the coupledline structure still going on until today [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Inter-connected coupled lines Resonator topology for bandpass filter application

Hushim¹,

Wahab²,

Zin³

et al. 2020

IJECE

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This paper presents an inter-connected side-shorted coupled-line resonator topology as a base cell. The base cell is built from two single-shorted quarter-wavelength coupled-line sections, connected in series to give a half-wavelength coupled-line that creates a single resonance of bandpass filter response. Higher-order bandpass filter is produced by adding new single-shorted coupled-line sections, cascaded in an inter-connected manner to the base cell. This new topology creates a unique arrangement that caused cross coupling effects between the resonators, resulting to the occurrence of transmission zeros that lead to the improvement of selectivity of the higher order bandpass filter response. For validation of concept, 2nd and 3rd order bandpass filters were fabricated using microstrip technology on Roger 3210 substrate with parameter of Ɛr = 10.2, h = 1.27 mm and tan δ = 3x10-3. The filters were measured and the results show good agreement with simulation results.

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Synthesis of a Single Side Access Ring Resonator for Higher Order Bandpass Filters

Cited by 9 publications

References 12 publications

Closed-loop ring resonator topology for bandpass filter applications

Closed-loop ring resonator topology for bandpass filter applications

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

Inter-connected coupled lines Resonator topology for bandpass filter application

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