Journal ArticleDOI
Design of Compensated Coupled-Stripline 3-dB Directional Couplers, Phase Shifters, and Magic-T's—Part I: Single-Section Coupled-Line Circuits
TLDR
In this article, the problem of discontinuities in coupled-stripline 3-dB directional couplers, phase shifters, and magic-T's, regarding the connections of coupled and terminating signal lines, has been comprehensively investigated for the first time.Abstract:
The problem of discontinuities in coupled-stripline 3-dB directional couplers, phase shifters, and magic-T's, regarding the connections of coupled and terminating signal lines, has been comprehensively investigated for the first time. The proposed equivalent circuit of these discontinuities, of which parameters can be computed in a process of fitting curves of the circuit and electromagnetic analyses, has been used for accurate modeling of coupled-stripline circuits. It has been shown that parasitic reactances, which result from connections of signal and coupled lines, severely deteriorate the return losses and the isolation of such circuits, and that these discontinuity effects can be substantially reduced by connecting compensating shunt capacitances to both coupled and signal lines. Results of measurements carried out for various designed and manufactured coupled-line circuits are most promising and prove the efficiency of the proposed compensation technique. This paper describes the technique of capacitive compensation of discontinuity effects in single-section coupled-line circuitsread more
Citations
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Journal ArticleDOI
Ultra-Wideband Phase Shifters
TL;DR: In this article, a method with clear guidelines is presented to design compact planar phase shifters with ultra wideband (UWB) characteristics, which exploits broadside coupling between top and bottom elliptical microstrip patches via an elliptical slot located in the mid layer, which forms the ground plane.
Journal ArticleDOI
Broadband 4 $\times$ 4 Butler Matrices as a Connection of Symmetrical Multisection Coupled-Line 3-dB Directional Couplers and Phase Correction Networks
S. Gruszczynski,K. Wincza +1 more
TL;DR: In this article, an innovative approach for realization of broadband 4 times 4 Butler matrices, in which broadband symmetrical multisection 3-dB/90deg directional couplers are used as basic elements, has been presented.
Journal ArticleDOI
Design of Compensated Coupled-Stripline 3-dB Directional Couplers, Phase Shifters, and Magic-T's—Part II: Broadband Coupled-Line Circuits
TL;DR: In this article, the authors investigated the problem of discontinuities in broadband multisection coupled-stripline 3-dB directional couplers, phase shifters, high-pass tapered-line 3dB directional Couplers and magic-T's, regarding the connections of coupled and terminating signal lines.
Journal ArticleDOI
Dual-band microstrip bandstop filter using dual-mode loop resonator
Hwann-Kaeo Chiou,C.-F. Tai +1 more
TL;DR: In this article, a dual-band bandstop filter (DBBSF) with a dualmode loop resonator is presented, which exhibits high skirt selectivity and a wide rejection bandwidth.
Journal ArticleDOI
Generalized Methods for the Design of Quasi-Ideal Symmetric and Asymmetric Coupled-Line Sections and Directional Couplers
TL;DR: In this paper, generalized methods for the design of quasi-ideal symmetric and asymmetric coupled-line sections have been proposed, which allow for designing quasiideal coupled line sections in nearly arbitrarily chosen dielectric media and for arbitrarily chosen coupling.
References
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Journal ArticleDOI
A Method of Analysis of Symmetrical Four-Port Networks
J. Reed,G.J. Wheeler +1 more
TL;DR: In this article, an analysis of four-arm symmetrical networks such as a branched directional double stub coupler or the hybrid ring (rat race) is presented, where the input wave is broken into an even and an odd mode and the vector amplitude out the various arms is computed from the sums or differences of the reflection or transmission coefficients for the two modes.
Journal ArticleDOI
A New Class of Broad-Band Microwave 90-Degree Phase Shifters
TL;DR: In this paper, the authors describe a new type of 90° differential phase shifter which has a constant resistance input, and which is useful over bandwidths as large as 5:1 in the microwave region.
Journal ArticleDOI
Low-loss compact Butler matrix for a microstrip antenna
TL;DR: In this article, a double four-port Butler matrix has been used to feed a four-column array antenna with two orthogonally polarized signals to obtain polarization diversity, and a bi-layer structure has been adopted to support the circuit.
Proceedings ArticleDOI
Phase Velocity Compensation in Parallel-Coupled Microstrip
TL;DR: In this paper, a cross between suspended-substrate stripline and microstrip can be used to manufacture quadrature couplers with improved, broadband directivity performance.
Journal ArticleDOI
Microstrip directional couplers with ideal performance via single-element compensation
TL;DR: In this paper, the authors present an accurate approach to the design of microstrip directional couplers with ideal match or high directivity of both, using a single capacitive of inductive compensation.
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