Transdirectional Coupled-Line Couplers Implemented by Periodical Shunt Capacitors

Shie, Ching-Ian; Cheng, Jui‐Ching; Chou, Sheng-Chun; Chiang, Yuan‐Cheng

doi:10.1109/tmtt.2009.2034219

Cited by 76 publications

(1 citation statement)

References 16 publications

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“…These lines exhibit a phase velocity smaller than that of ordinary lines. To achieve such slow-wave effect, several strategies are possible, including line loading with a periodic array of shunt connected capacitors [76][77][78][79][80][81][82][83], series inductors [84][85][86][87], or both elements simultaneously [88,89]. In all these cases of reactive loading, the effective capacitance and/or the effective inductance of the line are increased, and the result is a decrease in the phase velocity.…”

Section: Phase-variation Sensors Based On Slow-wave Artificial Transmission Linesmentioning

confidence: 99%

Planar Phase-Variation Microwave Sensors for Material Characterization: A Review and Comparison of Various Approaches

Muñoz-Enano

Coromina

Vélez

et al. 2021

Sensors

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Planar phase-variation microwave sensors have attracted increasing interest in recent years since they combine the advantages of planar technology (including low cost, low profile, and sensor integration with the associated circuitry for post-processing and communication purposes, among others) and the possibility of operation at a single frequency (thereby reducing the costs of the associated electronics). This paper reviews and compares three different strategies for sensitivity improvement in such phase-variation sensors (devoted to material characterization). The considered approaches include line elongation (through meandering), dispersion engineering (by considering slow-wave artificial transmission lines), and reflective-mode sensors based on step-impedance open-ended lines. It is shown that unprecedented sensitivities compatible with small sensing regions are achievable with the latter approach.

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Section: Phase-variation Sensors Based On Slow-wave Artificial Transmission Linesmentioning

confidence: 99%

Planar Phase-Variation Microwave Sensors for Material Characterization: A Review and Comparison of Various Approaches

Muñoz-Enano

Coromina

Vélez

et al. 2021

Sensors

View full text Add to dashboard Cite

show abstract

Shortened directional coupler using slow wave structure of periodically loaded capacitance and inductance

Zhong

Sun³

et al. 2015

Int J Numerical Modelling

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This paper proposes an analytically based approach for the design of a length-reduced directional coupler. This method of reduction is realizing the directional coupler's impedance transformers by using slow wave structures. These slow wave structures are designed by transmission lines periodically loading both shunt capacitances and series inductances. Loaded capacitance is realized by stub shunt capacitance on the top layer; at the same time, loaded inductance is realized by electromagnetic band gap structure on ground. Increasing parallel capacitance and series inductance can reduce the phase velocity of the propagating waves and hence engender higher electric lengths using smaller physical lengths. A directional coupler is designed using this slow wave structure, and the performance of coupling is analyzed with the generalized coupled-mode theory. The design methodology is validated with the design of a length-reduced directional coupler at 0.7 GHz. An approximate length reduction of 54% is achieved with this technique compared with the conventional directional coupler. The electromagnetic simulation and experimental results validate the proposed approach. Table I. Physical parameters of the coupler.Coupler's dimension (mm) W M1 = 2.3, W M2 = 1.4, W SLOT = 0.4, W STUB = 0.4, W M3 = 0.6, W M4 = 1, L M = 5, L S = 12, L = 31, S = 0.12, 490 C. ZHONG ET AL.

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Synthesis of miniaturized filtering coupled‐line trans‐directional coupler with wide suppression band

Liu

Wang

et al. 2021

Int J RF Microw Comput Aided Eng

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In this paper, the synthesis of miniaturized filtering coupled‐line trans‐directional (CL‐TRD) coupler with wide suppression band is presented. This coupler is formed by two parallel coupled lines, one capacitor‐loaded coupled line, and four sub‐circuits. With the introduction of the sub‐circuits, extra transmission poles located at the cut‐off frequency are generated, resulting in high frequency selectivity. Size reduction is also achieved. Design equations of the filtering CL‐TRD coupler are derived using the even‐odd mode decomposition analysis and design procedures are provided for guidance. For demonstration, a 3 dB prototype with a size of 0.46 λg × 0.21 λg is designed, fabricated and measured. The measured results validate the 32% bandwidth centered at 1 GHz with more than 10 dB return loss/isolation, less than 0.5 dB amplitude imbalance and 5° phase error. Besides, a 15 dB wide stopband from 1.18 to 5.07 GHz (5.07f0) is obtained with a sharped skirt selectivity.

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Transdirectional Coupled-Line Couplers Implemented by Periodical Shunt Capacitors

Cited by 76 publications

References 16 publications

Planar Phase-Variation Microwave Sensors for Material Characterization: A Review and Comparison of Various Approaches

Planar Phase-Variation Microwave Sensors for Material Characterization: A Review and Comparison of Various Approaches

Shortened directional coupler using slow wave structure of periodically loaded capacitance and inductance

Synthesis of miniaturized filtering coupled‐line trans‐directional coupler with wide suppression band

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