Wide-band lumped-element directional coupler with an arbitrary coupling coefficient

2004 ◽  
Vol 151 (4) ◽  
pp. 303 ◽  
Author(s):  
W.S. Tung ◽  
Y.C. Chiang
Keyword(s):  
Coupling Coefficient ◽  
Directional Coupler ◽  
Wide Band ◽  
Lumped Element ◽  
Arbitrary Coupling

Novel rat-race coupler design of arbitrary coupling coefficient using substrate integrated waveguide cavity

2018 ◽  
Vol 10 (8) ◽  
pp. 861-869 ◽  
Author(s):  
Min-Hua Ho ◽  
Yi-Hao Hong ◽  
Jen-Chih Li
Keyword(s):  
Transmission Lines ◽  
Coupling Coefficient ◽  
Substrate Integrated Waveguide ◽  
Cavity Field ◽  
Arbitrary Coupling ◽  
Degenerate Mode ◽  
Quarter Wavelength ◽  
Small Phase ◽  
Hybrid Coupler ◽  
Degenerate Modes

AbstractThe contribution of this paper is to propose a novel rat-race hybrid coupler of arbitrary coupling coefficient. Traditionally, the rat-race hybrid couplers are built by various loop-alike transmission-lines of multiple quarter-wavelength, and in this paper, we approach the coupler design by using a circular substrate integrated waveguide (SIW) cavity (SIWC). The employed SIWC supports two mutually orthogonal degenerate modes, and cavity field is formed by the two modes in an arbitrary weighting ratio which defines the proposed rat-race coupler's coupling coefficient. The cavity is excited by a microstrip combined coupling slot with the microstrip along a specifically chosen direction. The energy of each degenerate mode can be solely extracted by an associated subminiature version A (SMA) whose position is carefully determined. The isolation between the coupling slots is assured by their perpendicular layout, and the isolation between the SMA probes is obtained by the orthogonality of the two degenerate modes. Experiments are conducted on the 3- and 10-dB coupling coefficient samples to verify this novel rat-race coupler design. The measurements agree well with the simulations, and circuit's good performance is observed in terms of coupling precision, isolations, and small phase imbalances.

scholarly journals Differential Bi-Level Microstrip Directional Coupler with Equalized Coupling Coefficients for Directivity Improvement

Electronics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 547
Author(s):  
Slawomir Gruszczynski ◽  
Robert Smolarz ◽  
Krzysztof Wincza
Keyword(s):  
Coupling Coefficient ◽  
Dielectric Layer ◽  
Directional Coupler ◽  
Capacitive Coupling ◽  
Coupling Coefficients ◽  
Coupled Line ◽  
Line Section ◽  
Measurement Results

In this paper, a bi-level microstrip differential directional coupler has been investigated. It has been shown that the equalization of coupling coefficients can be successfully made with the use of appropriate dielectric stack-up and conductor geometry. The application of additional top dielectric layer can ensure proper equalization of coupling coefficients by lowering the value of capacitive coupling coefficient to the value of the inductive one. The theoretically investigated coupled-line section has been used for the design of a 3-dB differential directional coupler. The measurement results are compared with the theoretical ones.

A Wide-Band, High Isolation UHF Lumped-Element Ferrite Circulator

2013 ◽  
Vol 23 (6) ◽  
pp. 294-296 ◽  
Author(s):  
Hang Dong ◽  
Jacob R. Smith ◽  
Jeffrey L. Young
Keyword(s):  
Wide Band ◽  
High Isolation ◽  
Lumped Element

A novel wide-band tunable RF phase shifter using a variable optical directional coupler

1999 ◽  
Vol 47 (5) ◽  
pp. 645-648 ◽  
Author(s):  
K. Ghorbani ◽  
A. Mitchell ◽  
R.B. Waterhouse ◽  
M.W. Austin
Keyword(s):  
Directional Coupler ◽  
Phase Shifter ◽  
Wide Band
Sign in / Sign up

Export Citation Format

Share Document