Design and Development of a Compact Rat-Race Coupler

In this paper, design and development of compact Rat- Race coupler is presented. The device is designed with commercially available semi rigid coaxial cable. The semi rigid coaxial is modified for desired impedance to suit the requirement of Rat- race hybrid coupler. The physical structure of the coupler is in rectangular form instead of the conventional ring form. With this structure, all the ports are available in line on the same side. This eases the integration of the device with other modules or devices in the system. The total area occupied the coupler is reduced drastically by meandering the transmission line. The shielded transmission line provides better port isolation and less radiation loss. Design, implementation and measured results are presented.

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Exceptional Points of Degeneracy in a Transmission Line Periodically Loaded with Gain and Radiation Loss

2021 United States National Committee of URSI National Radio Science Meeting (USNC-URSI NRSM) ◽

10.23919/usnc-ursinrsm51531.2021.9336503 ◽

2021 ◽

Author(s):

Ehsan Hafezi ◽

Ahmed F. Abdelshafy ◽

Tarek Mealy ◽

Alireza Nikzamir ◽

Filippo Capolino

Keyword(s):

Transmission Line ◽

Radiation Loss ◽

Exceptional Points

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An Innovative Use of TDR Probes: First Numerical Validations with a Coaxial Cable

Journal of Environmental and Engineering Geophysics ◽

10.2113/jeeg23.4.437 ◽

2018 ◽

Vol 23 (4) ◽

pp. 437-442

Author(s):

Raffaele Persico ◽

Iman Farhat ◽

Lourdes Farrugia ◽

Sebastiano D'Amico ◽

Charles Sammut

Keyword(s):

Magnetic Properties ◽

Transmission Line ◽

Time Domain ◽

Numerical Data ◽

Time Domain Reflectometry ◽

Coaxial Cable ◽

Transmission Line Model ◽

Properties Of Materials

In this paper we propose a study regarding some possibilities that can be offered by a time domain reflectometry (TDR) probe in retrieving both dielectric and magnetic properties of materials. This technique can be of interest for several applications, among which the characterization of soil in some situations. In particular, here we propose an extension of the paper “Retrieving electric and magnetic propetries of the soil in situ: New possibilities”, presented at the IWAGPR, held in Edinburgh in 2017, and as a new contribution we will validate a transmission line model with numerical data simulated by the CST code.

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Mesh analysis for extracting the S-parameters of lumped element RF and microwave circuits

International Journal of Electrical Engineering Education ◽

10.7227/ijeee.0005 ◽

2014 ◽

Vol 51 (4) ◽

pp. 330-339 ◽

Cited By ~ 1

Author(s):

Terry L. Moss ◽

Yinchao Chen

Keyword(s):

Transmission Line ◽

Rf Circuits ◽

First Year ◽

Current Analysis ◽

Analysis Techniques ◽

Lumped Element ◽

Engineering Studies ◽

S Parameters ◽

Hybrid Coupler ◽

Sophisticated Analysis

This paper demonstrates the applicability of basic mesh current circuit analysis techniques, usually learned in the first year of engineering studies, to lumped element RF circuits, which are usually taught with more sophisticated analysis techniques. As an example, the S-parameters of the 90° lumped element hybrid coupler is derived using the traditional mesh current analysis, and compared to that of the distributed micro-strip response. The distributed transmission line coupler is transformed into equivalent lumped element PI sections, and then combined for the resulting lumped element coupler. Mesh current analysis is then utilized to demonstrate the equivalence between the lumped element coupler and the micro-strip coupler as well as the ability to easily simulate the effects of finite inductor Q on the circuit's performance.

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