UMTS diplexer design using dual-mode stripline ring resonators

Xu, Wei-Qin; Ho, Min‐Hua; Hsu, Chung-I G.

doi:10.1049/el:20070747

Cited by 31 publications

(17 citation statements)

References 3 publications

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“…Proposed Diplexer Requires a T-junction [1][2][3][4][5], a Y-junction [6][7][8], a circulator [9][10][11] or a manifold [12][13][14][15] for energy distribution between the transmit and the receive channels…”

Section: Common Resonator Diplexermentioning

confidence: 99%

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Microwave Diplexer Purely Based on Direct Synchronous and Asynchronous Coupling

Nwajana¹,

Yeo

2016

RADIOENGINEERING

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Section: Common Resonator Diplexermentioning

confidence: 99%

“…This connecting device could be a T-junction [1][2][3][4][5], a Y-junction [6][7][8], a circulator [9][10][11], a manifold [12][13][14][15] and recently, a common resonator [16][17][18][19]. The external junctions utilized in the conventional approach to diplexer design had resulted in more complex and larger size diplexer devices.…”

Section: Introductionmentioning

confidence: 99%

Microwave Diplexer Purely Based on Direct Synchronous and Asynchronous Coupling

Nwajana¹,

Yeo

2016

RADIOENGINEERING

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“…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%

“…In [2], microstrip electromagnetic band gap structure is used to get wide stopband of the diplexer, but the selectivity is not good. 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.…”

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 [11,12], folded coupled-line structure and dual-mode stripline ring resonators are utilized to produce transmission zeros to improve the selectivity of the diplexer, respectively. In [13], microstrip electromagnetic band gap structure is used to get wide stopband of the diplexer, but the selectivity is not good.…”

Section: Introductionmentioning

confidence: 99%

Diplexers Based on Microstrip Line Resonators With Loaded Elements

Shi¹,

Chen²,

Bao³

2011

PIER

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Abstract-In this paper, microstrip line resonators with loaded elements are proposed and studied to design microstrip diplexer. To demonstrate the design ideas, the equivalent circuits of the proposed resonators are built and studied. It is found that the different loads on different positions of the proposed half-wavelength resonator make the resonator have different features, which will easily control the characteristic of the diplexers. And here, resistor, open stub, and shorted stub are used as loaded elements. It is found the resistor loaded on the center of the microstrip line resonator can extremely reduce the unloaded quality factor of even-mode resonant frequency, which can be used to suppress the harmonics of the diplexer. The loaded open stub not only can reduce the size of the diplexer, but also can control the frequency ratio between the fundamental frequency and second harmonic of a resonator, which can increases the frequency ratio between the two passbands of the diplexer. As for the loaded shorted stub, it can enlarge the size of the diplexer. To demonstrate the design ideas, three diplexers are presented. The comparisons between the loaded and unloaded diplexers are given. The experimental results agree well to the theoretical predictions and simulations.

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UMTS diplexer design using dual-mode stripline ring resonators

Cited by 31 publications

References 3 publications

Microwave Diplexer Purely Based on Direct Synchronous and Asynchronous Coupling

Microwave Diplexer Purely Based on Direct Synchronous and Asynchronous Coupling

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

Diplexers Based on Microstrip Line Resonators With Loaded Elements

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