A High Band Isolation and Wide Stopband Diplexer Using Dual-Mode Stepped-Impedance Resonators

Huang, Chun-Yueh; Weng, Min‐Hang; Ye, Chang-Sin; Xu, Yuehang

doi:10.2528/pier09112701

Cited by 33 publications

(30 citation statements)

References 15 publications

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“…The most employed distribution network used today may be the T-junction (as in [1][2][3][4][5]) connecting the T X and RX filters. The diplexer with the T-junction configuration has drawbacks of large volume and time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Microwave Resonator Diplexers Using Linear Frequency Transformation and Optimization

Wang¹,

Xu²,

Wang³

et al. 2012

PIER

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Abstract-This paper presents a method for synthesizing coupled resonator diplexers composed of T X and RX filters (two types of junctions connecting the T X and RX filters are considered). For the first junction type, the common port is directly coupled to the first resonator of the T X and RX filters, respectively. For the second junction type, common node is realized by adding an extra resonator besides those of the T X and RX filters. The method is based on the evaluation of the characteristic polynomials of the diplexer using the proposed linear frequency transformation and well-established method, and then the "N + 3" coupling matrix of overall diplexer can be obtained using hybrid optimization methods. Two diplexers have been designed and fabricated to validate the proposed method.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Microwave Resonator Diplexers Using Linear Frequency Transformation and Optimization

Wang¹,

Xu²,

Wang³

et al. 2012

PIER

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show abstract

“…In [3,4], dual-mode stripline ring resonators and folded coupled-line structure are employed to produce transmission zeros to improve the selectivity of the diplexer. Microstrip diplexers and filters were realized based on modified stepped-impedance resonators [5,6], dual-mode stepped-impedance resonators [7] and defected ground structure [8,9] to achieve good selectivity, high isolation and wide stopband. In [10], a diplexer was proposed by utilizing common resonator sections.…”

Section: Introductionmentioning

confidence: 99%

“…So far, a variety of configurations were proposed to implement diplexers [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. A well designed diplexer should have compact circuit size, low cost and high performance.…”

Section: Introductionmentioning

confidence: 99%

Design of Compact Quad-Channel Diplexer Using Quad-Mode Stub-Loaded Resonators

Lin¹,

Zhao²,

Wu³

et al. 2015

PIER Letters

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Abstract-In this paper, a compact quad-channel diplexer utilizing quad-mode stub-loaded resonators (QMSLRs) is proposed. The proposed quad-channel diplexer is composed of two dual-band bandpass filters (BPFs) based on QMSLRs and source-load coupling lines. Due to the symmetry of the proposed quad-mode resonator, its resonance characteristics are analyzed by using the even-odd-mode method twice. All four modes equivalent circuits of the resonator are quarter wavelength resonators, so the circuit size can be very compact, and the first resonance frequencies is three times of the fundamental ones. Stub-to-stub coupling is introduced to split two identical resonance modes, which is in favor of implementing dual-band BPF by using a single quad-mode resonator. By tuning the corresponding physical dimensions of the stubs, the resonant modes can be individually adjusted. The source-load coupling lines are properly designed to provide appropriate external coupling for the passbands and high isolation level between channels. For demonstration, a quad-channel diplexer (0.9/1.2 GHz at Load 1 and 1.5/1.8 GHz at Load 2) using the quad-mode resonator is designed, fabricated and measured. The simulated and measured results with good agreement are presented.

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“…In addition, two hairpin line filtering structures were used to form a diplexer, and a tapped open stub was used to introduce an attenuation pole to suppress the spurious response and achieve a high isolation between two bands [9]. Parallel coupled lines [10] square ring resonators [11] and dualmode stepped-impedance resonator (SIR) [12] were also developed for the diplexer. However, the band isolation and upper stopband were still poor.…”

Section: Introductionmentioning

confidence: 99%

“…For such multi-service functions of the modern communication systems, compactsize and high performance planar diplexers are widely popular. In the past, some methods were reported to design diplexers [5][6][7][8][9][10][11][12]. For example, the ridge waveguide T -junctions were used for wideband diplexer applications [5,6].…”

Section: Introductionmentioning

confidence: 99%

Design of a High Band Isolation Diplexer for GPS and Wlan System Using Modified Stepped-Impedance Resonators

Yang¹,

Hsiung²,

Hung³

et al. 2010

PIER

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Abstract-In this paper, we presented the design of a high performance diplexer for applications of global positioning system (GPS) at 1.575 GHz and wireless local area network (WLAN) at 2.4 GHz, simultaneously. Two bandpass filters (BPFs) using the modified stepped-impedance resonators (SIRs) operated at 1.575 GHz and 2.4 GHz are the main blocks for the proposed diplexer. By discussing and analyzing the admittance of the even and odd modes, the transmission zero of the modified SIR can be found, and the

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A High Band Isolation and Wide Stopband Diplexer Using Dual-Mode Stepped-Impedance Resonators

Abstract: Abstract-In this paper, a high performance diplexer is designed and fabricated for Global Positioning System (GPS) and wireless local area network (WLAN) applications simultaneously. The diplexer mainly comprises two dual-mode ring bandpass filters (BPFs), operated at

Cited by 33 publications

References 15 publications

Synthesis of Microwave Resonator Diplexers Using Linear Frequency Transformation and Optimization

Synthesis of Microwave Resonator Diplexers Using Linear Frequency Transformation and Optimization

Design of Compact Quad-Channel Diplexer Using Quad-Mode Stub-Loaded Resonators

Design of a High Band Isolation Diplexer for GPS and Wlan System Using Modified Stepped-Impedance Resonators

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