Microstrip Diplexer Design Using Common T-Shaped Resonator

Chuang, Ming‐Lin; Wu, Ming-Tien

doi:10.1109/lmwc.2011.2168949

Cited by 152 publications

(104 citation statements)

References 14 publications

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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%

“…It composed of five resonators, and the circuit size could be improved further more. In [11], a diplexer employing a T-shape resonator as the common resonator and frequency selective splitter was presented, and the two bands are extremely close. To improve the out-of-band rejection level, a diplexer based on slot-line hairpin stepped impedance resonator structure was proposed in [12].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

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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“…The diplexer with the T-junction configuration has drawbacks of large volume and time-consuming. Some interesting diplexers design without distribution networks have appeared in the recent literatures [6][7][8][9][10][11][12]. A new topology of the diplexer with the common port directly connected to two filters was proposed and synthesized in [7], although no design example was given.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the diplexer structures proposed in [8,9] has poorer isolation than that shown in Figure 1. In [10][11][12], miniaturized microstrip resonators diplexers designed using common resonator sections have been proposed. These common resonator sections must have two resonant frequencies, playing roles as the one resonator of the T X and RX filters, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Type-I diplexer has compact circuit size. When two resonators coupled to common port 1 are replaced one resonator with two resonant frequencies (such as SIR in [10] and T-shaped resonator in [11]), the size of Type-I diplexer can be further reduced. Type-II diplexer has characteristics of easy implement and high isolation, although its configuration has drawbacks of large volume due to adding an extra resonator.…”

Section: Introductionmentioning

confidence: 99%

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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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Compact quad‐channel high‐temperature superconducting diplexer based on stub‐loaded square ring resonator

Guan

Gui

Ren

et al. 2019

Int J RF Microw Comput Aided Eng

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A compact quad-channel high-temperature superconducting diplexer based on stubloaded square ring resonator (S-LSRR) is proposed. The proposed resonator consists of a square ring with symmetrically loaded two open-circuited stubs and provides four resonant modes for quad-channel applications. Even-and odd-mode methods are applied to analyze the S-LSRR. Analytical study shows that four resonant modes of one S-LSRR can be designed in two pairs and applied to construct two of four channels of the designed diplexer. A square patch is added to the resonator for providing an additional parameter to tune the resonant modes. Based on the proposed resonator, a quadchannel diplexer with center frequencies of 2.4, 3.2, 3.9, and 5.6 GHz is designed. For demonstration, the diplexer is fabricated on 2-in-diameter 0.5 mm-thick MgO wafer with double sided YBa 2 Cu 3 O y films and measured at 77 K. Good agreement between the simulation and measurement is obtained. The diplexer has a compact size of 0.25 λ g × 0.45 λ g , where λ g is guided wave length at the center frequency of first channel. K E Y W O R D Shigh-temperature superconducting, quad-channel diplexer, stub-loaded square ring resonator

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Microstrip Diplexer Design Using Common T-Shaped Resonator

Cited by 152 publications

References 14 publications

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

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

Synthesis of Microwave Resonator Diplexers Using Linear Frequency Transformation and Optimization

Compact quad‐channel high‐temperature superconducting diplexer based on stub‐loaded square ring resonator

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