Journal ArticleDOI
A Novel Planar Impedance-Transforming Tight-Coupling Coupler and Its Applications to Microstrip Baluns
TLDR
In this article, a novel impedance-transforming coupled-line coupler with strong coupling coefficient is proposed for microstrip baluns, which has many advantages including planar structure without any via holes, strong coupled lines, and wide operation bandwidth.Abstract:
A novel impedance-transforming coupled-line coupler with strong coupling coefficient is proposed in this paper. Its analytical design methodology and applications to microstrip baluns are presented. For demonstration purposes, four numerical examples of this proposed impedance-transforming coupler with different terminated impedances are given. The calculated results show that this proposed coupler not only matches two different groups of terminated impedances but also covers the total power-dividing ratio range from 0 dB to infinite value. The measured results of the fabricated coupler verify the proposed design approach. Finally, this kind of coupler is used to construct a novel planar microstrip balun. This proposed balun has many advantages including planar structure without any via holes, strong coupled lines, and wide operation bandwidth. The experimental results of this proposed balun operating at approximately 2 GHz demonstrated these proposed ideas.read more
Citations
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Journal ArticleDOI
A Universal Approach for Designing an Unequal Branch-Line Coupler With Arbitrary Phase Differences and Input/Output Impedances
TL;DR: In this paper, the authors presented an approach for designing a coupler with arbitrary division, optional phase difference, and alternative input/output impedances, which is well applicable to the applications that require high flexibility in couplers' performances.
Journal ArticleDOI
Design Methodology for Six-Port Equal/Unequal Quadrature and Rat-Race Couplers With Balanced and Unbalanced Ports Terminated by Arbitrary Resistances
TL;DR: Four types of coupler types including quadrature and rat-race couplers are fully analyzed, covering all the application configurations of the balanced/unbalanced ports, and the design equations are rigorously derived.
Journal ArticleDOI
High-Performance Filtering Antenna Using Spoof Surface Plasmon Polaritons
TL;DR: In this article, a novel filtering antenna based on periodic spoof surface plasmon polaritons (SSPPs) is proposed, which achieves high gain of 9.38 dBi and bandwidth of 10.44% for the antenna with via holes and ring resonators, the out-of-band rejection is over 17 dBi.
Journal ArticleDOI
Balanced Rat-Race Couplers With Wideband Common-Mode Suppression
Wenjie Feng,Wenquan Che,Yongrong Shi,Roberto Gomez-Garcia,Chenxu Wang,Quan Xue,Xiu Yin Zhang,Xin Yu Zhou +7 more
TL;DR: In this article, various types of balanced rat-race couplers with wideband common-mode suppression characteristics are presented, where the input and output ports can functionalize either as single-ended or differential terminals to realize different operational modes.
Journal ArticleDOI
A Planar Dual-Band Coupled-Line Balun With Impedance Transformation and High Isolation
TL;DR: A novel planar dual-band coupled-line balun with impedance transformation and high isolation with good agreement between the simulated and measured results, which effectively confirm the proposed theoretical predictions.
References
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Book
RF and microwave coupled-line circuits
TL;DR: In this paper, the authors present a theoretical analysis of planar transmission lines with parallel-coupled TEM Directional Couplers and tight couplers, as well as Coupled-Line Filter Fundamentals.
Journal ArticleDOI
Analysis and design of impedance-transforming planar Marchand baluns
Kian Sen Ang,Ian D. Robertson +1 more
TL;DR: In this paper, a technique for designing impedance-transforming baluns is presented, which is based on the Marchand balun with two identical coupled lines, by varying the coupling factor of the coupled sections, a wide range of impedance transforming ratios can be achieved.
Journal ArticleDOI
Novel Balanced Coupled-Line Bandpass Filters With Common-Mode Noise Suppression
TL;DR: In this paper, a novel balanced coupled-line bandpass filters, using suitable balanced coupled line sections and quarter-wavelength resonators, are proposed to achieve the desired differential-mode response and the level of common-mode noise.
Journal ArticleDOI
Dual- and Triple-Band Wilkinson Power Dividers Based on Composite Right- and Left-Handed Transmission Lines
Alper Genc,Reyhan Baktur +1 more
TL;DR: In this article, dual-and triple-band equal-split Wilkinson power dividers (WPDs) based on composite right-and left-handed transmission lines are proposed.
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