Theoretical analysis of a branch line quantum directional coupler

1994 ◽  
Vol 65 (19) ◽  
pp. 2439-2441 ◽  
Author(s):  
O. Vanbésien ◽  
D. Lippens
Keyword(s):  
Theoretical Analysis ◽  
Directional Coupler ◽  
Branch Line

Design of constant width branch line directional coupler for the microwave sensing application

2020 ◽  
Author(s):  
Pramod K B Rangaiah ◽  
Javad Ebrahimizadeh ◽  
Jacob Velander ◽  
Roger Karlsson ◽  
Bappaditya Mandal ◽  
...  
Keyword(s):  
Directional Coupler ◽  
Constant Width ◽  
Branch Line ◽  
Sensing Application

W-band waveguide 3dB directional coupler based on E-plane branch line bridge

2013 ◽  
Author(s):  
Pei Zheng ◽  
Hou-Jun Sun ◽  
Meng-Jia Luo ◽  
Zhi-Lei Wen ◽  
Hong Deng
Keyword(s):  
Directional Coupler ◽  
Branch Line ◽  
W Band

Application of RH and LH sections for reduction of coupling coefficients in two-section asymmetric directional couplers

2015 ◽  
Vol 8 (3) ◽  
pp. 559-565 ◽  
Author(s):  
Jakub Sorocki ◽  
Kamil Staszek ◽  
Ilona Piekarz ◽  
Krzysztof Wincza ◽  
Slawomir Gruszczynski
Keyword(s):  
Theoretical Analysis ◽  
Transmission Lines ◽  
Directional Coupler ◽  
Center Frequency ◽  
Coupling Coefficients ◽  
Directional Couplers ◽  
Coupled Line ◽  
Left Handed ◽  
Design Flexibility

A method allowing for reduction of coupling coefficients required for realization of two-section asymmetrical coupled-line directional couplers has been proposed. It has been shown that by connecting uncoupled left-handed and right-handed transmission lines between two coupled-line sections one can obtain greater design flexibility of the resulting circuit, simultaneously with the coupling reduction in coupled-line sections. Moreover, the proposed circuit features the properties of two-section asymmetric directional couplers offering wide operational bandwidth. The theoretical analysis has been verified by measurements of a 3 dB directional coupler operating at the center frequency f0 = 1.5 GHz having coupling imbalance δC = ±0.4 dB and bandwidth 0.75–2.3 GHz.

scholarly journals Monolithic Miniaturized Differentially-Fed Branch-Line Directional Coupler in GaAs Monolithic Technology

Electronics ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 446
Author(s):  
Slawomir Gruszczynski ◽  
Robert Smolarz ◽  
Changying Wu ◽  
Krzysztof Wincza
Keyword(s):  
Directional Coupler ◽  
Center Frequency ◽  
Semiconductor Technology ◽  
Coupled Line ◽  
Full Size ◽  
Branch Line ◽  
Power Split ◽  
24 Ghz ◽  
Measured Power

In this paper, a design of a miniaturized branch-line directional coupler is presented. The coupler is designed with balanced coupled-line sections, which are electrically shortened by the application of lumped capacitors. To measure the parameters of the coupler, appropriate baluns have been designed. The coupler has been designed in a GaAs PH25 UMS (united monolithic semiconductor) technology with the center frequency of 24 GHz. The measured power split equals 3 dB with the transmission/coupling imbalance not exceeding 0.6 dB. The measured return losses equal 17 dB at the center frequency, whereas the isolation reaches 17 dB. The fabricated coupler‘s size equals 630 um × 487 um, which is 0.19 of the full size of the directional coupler in the chosen technology (1191 um × 1170 um).

A Miniaturized Branch-Line Directional Coupler on Low Temperature Cofired Ceramic Board

2001 ◽  
Author(s):  
E. Loskot ◽  
S. Leppavuori ◽  
A. Kourbanov ◽  
I. Vendik ◽  
A. Lapshin ◽  
...  
Keyword(s):  
Low Temperature ◽  
Directional Coupler ◽  
Branch Line

Theoretical Analysis of a Acoupled Fiber Ring Resonator

2013 ◽  
Vol 397-400 ◽  
pp. 765-771
Author(s):  
Xiao Min Zhang ◽  
Yan Ke Ci ◽  
Jin Li Yao ◽  
Jing Li Wang
Keyword(s):  
Theoretical Analysis ◽  
Power Distribution ◽  
Directional Coupler ◽  
Ring Resonator ◽  
Transmission Function ◽  
Optical Power ◽  
Fiber Ring ◽  
Fiber Ring Resonator ◽  
Simulation Results ◽  
Stimulated Brillouin

A fiber ring is very commonly used to generate stimulated Brillouin scatterings(SBS), especially by using fiber ring resonator. In this paper we theoretically analyzed some parameters of our interest in a coupled fiber ring resonator. We firstly analyzed a directional coupler, determined the optical power distribution among the four ports of the coupler. Then theoretically analyzed the transmission function of a coupled fiber ring resonator, followed by the simulation of the analysis. The simulation results show that the smaller the coupling coefficient is, the better the cavity finesse and extinction ration are, the lower the SBS threshold is, which is of great importance when it comes to the generation of SBS.

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