Dual‐mode bandpass filters using triangular ring resonators with coupling stubs

Weng, Min‐Hang; Hung, Cheng‐Yuan; Chen, Wu-Nan

doi:10.1002/mop.20519

Cited by 8 publications

(6 citation statements)

References 6 publications

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“…Therefore, the parameters for obtaining the transmission S 21 = 0 are the parameters to control the appearance of the transmission zero. Since the main difference between Z even and Z odd is the circuit of the perturbation element [1,5], the parameter for obtaining the transmission S 21 = 0 mainly results from the perturbation length (p). It is clearly observed that the transmission zeros are varied with different perturbation lengths (p).…”

Section: Design Proceduresmentioning

confidence: 99%

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Design of a Dual-Band Bandpass Filter Using a Cross Ring Resonator

Zhao¹,

Weng²,

Tsai³

et al. 2019

PIER Letters

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In this paper, a new dual-band bandpass filter (BPF) using a cross ring resonator is designed. The cross ring resonator is modified from a typical dual-mode ring resonator and has four parallel coupling gaps (g). The resonant modes of the proposed cross ring resonator is investigated first. It is found that the first mode and the second mode can be tuned individually. The filter performances are simulated by using full-wave simulator IE3D. A filter example having two passbands operated at 2.4/5.2 GHz of wireless local area network (WLAN) applications is described to verify the design concept. The fabricated filter has measured characteristics including average insertion losses of 2.0 dB and 1.8 dB and return losses larger than 22 dB and 10 dB for 2.4/5.2 GHz, respectively. Two transmission zeros with high frequency selectivity of 40 dB and 42 dB are obtained near the first passband at 2.2 GHz and 2.7 GHz, respectively. This design is very simple as compared to other design methods, and the measured results prove the design concept of the proposed structure.

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Section: Design Proceduresmentioning

confidence: 99%

“…In various types of the resonators, dual mode ring resonator is popular due to its simple structure and design method [5]. However, it is difficult to tune the second resonant mode of the conventional dual mode ring resonator due to the natural harmonics.…”

Section: Introductionmentioning

confidence: 99%

Design of a Dual-Band Bandpass Filter Using a Cross Ring Resonator

Zhao¹,

Weng²,

Tsai³

et al. 2019

PIER Letters

View full text Add to dashboard Cite

show abstract

“…The annular ring resonator was first introduced by Wolff and Knoppik [1]. Until now, the ring resonators can be formed as annular [2], triangular [3, 4], and square [5] type so on. As the mean periphery of the ring resonator is typically one‐guided wavelength, several resonant modes are appeared based on an integral multiple guided wavelength.…”

Section: Introductionmentioning

confidence: 99%

Analyses of a square ring resonator used for bandpass filter design with multispurious suppression

Pan

Yang

Lin

2012

Micro & Optical Tech Letters

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In this article, we proposed a method to analyze the voltages, currents, and imaginary impedances of the resonant modes in the square ring resonator by converting the square ring resonator to a guided wavelength transmission line.The impedance of the first four resonant modes of the ring resonator can be found and used as the coupling region for the bandpass response design with a high quality and multispurious suppression. A filter example using this concept was designed, fabricated, and measured. The filter composed of two square ring resonators and a half wavelength microstrip line showed a wide rejection bandwidth until four times the passband frequency. The simulated and measured results of the filter example were in a good agreement. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:1089–1092, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26702

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“…The physical length L of the square ring resonator is designed to determine the fundamental center frequency for the UWB passband, i.e., 4.02 GHz. In conventional dual mode BPF design, the filter structure satisfies three conditions, including that (1) the input and output (I/O) ports connected to the center point of the coupling lines are separated orthogonally; (2) a perturbation element is existed within the ring resonator, and (3) a symmetric plane is existed in the circuit geometry [3][4][5][6]. The BPF consists of square ring resonator with a perturbation element and a pair of the coupling lines.…”

Section: Introductionmentioning

confidence: 99%

A low‐loss ring UWB bandpass filter

Weng¹,

Liu²,

Liu³

et al. 2008

Micro & Optical Tech Letters

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In this article, a compact and low loss ring ultra‐wideband (UWB) bandpass filter (BPF) with an enlarged perturbation element is designed and implemented on FR4 substrate. This filter at center frequency f0 of 4.16 GHz has presented almost very good measured characteristics including the bandwidth of 3.04–5.27 GHz (3‐dB fractional bandwidth of 54%), a low insertion loss of 0.8 dB, a high passband selectivity due to two transmission zeros in the passband edges, and a low group delay varied between 0.1 and 0.6 ns. Experimental results of the fabricated filter show a good agreement with the predict results. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2317–2319, 2008; Published online in Wiley InterScience (www.interscience.wiley.com).DOI 10.1002/mop.23639

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Dual‐mode bandpass filters using triangular ring resonators with coupling stubs

Cited by 8 publications

References 6 publications

Design of a Dual-Band Bandpass Filter Using a Cross Ring Resonator

Design of a Dual-Band Bandpass Filter Using a Cross Ring Resonator

Analyses of a square ring resonator used for bandpass filter design with multispurious suppression

A low‐loss ring UWB bandpass filter

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