Dualband bandpass filter using side-coupled ring resonator

Saleh, Mohd Iskandar Mohd; Salleh, Mohd Khairul Mohd; Jusoh, M.

doi:10.1109/ieacon.2016.8067413

Cited by 2 publications

(2 citation statements)

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“…Several performance parameters of the proposed CLCRRF is compared with other published works as tabulated in Table 5. 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 .…”

Section: Comparisons Of Coupled Line Type Filters Designmentioning

confidence: 99%

“…Coupled lines have been extensively used in radio frequency (RF) systems and millimetre wave circuits such as couplers [1,2], baluns [3,4], impedance matching networks [5], and filters [6]. Microstrip ring resonators include coupled lines that are either edge or side coupled to a transmission line and have two resonances with superior in-band and out-of-band responses [7][8][9][10][11]; moreover, they can provide increased bandwidth for filter applications. In contrast, a general ring resonator filter consists of a transmission line, coupling gap, and a ring whose circumference is equal to one wavelength and provides dual-mode resonances by introducing perturbation elements [12][13][14].…”

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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