Design and Analysis of Transitions From Rectangular Waveguide to Layered Ridge Dielectric Waveguide
Design and Analysis of Transitions From Rectangular Waveguide to Layered Ridge Dielectric Waveguide

Author: George E. Ponchak

Publisher:

Published: 1996

Total Pages: 32

ISBN-13:

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Transitions from rectangular waveguide to layered ridge dielectric waveguide are studied both experimentally and theoretically. In addition, a design procedure is given for each transition. The analysis and design procedures are valid for transitions between rectangular waveguide and other open dielectric waveguides such as Image Guide, Insulated Image Guide, Dielectric Ridge Guide, and Inverted Strip Dielectric Waveguide. It is shown that for small dielectric waveguides such as a Layered Ridge Dielectric Waveguide, a transition which is comprised of a tapered ridge waveguide reduces the radiation loss by at least 1 dB.

Sub-Millimeter Waveguide for Monolithic Circuits
Sub-Millimeter Waveguide for Monolithic Circuits

Author: Nihad I. Dib

Publisher:

Published: 1997

Total Pages: 0

ISBN-13:

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Millimeter and sub-millimeter wave three-dimensional open dielectric structures are characterized using the Finite Difference Time Domain (FDTD) technique. The use of FDTD method allows for the accurate characterization of these components over a very wide frequency range. Three different sub-mm wave transitions to layered ridge dielectric waveguide (LRDW) are analyzed. These are found to be efficient over a wide sub-mm frequency band which makes them useful for a variety of applications. Theoretical results for a mm-wave image guide coupler show good agreement with experimental data. Sub-mm wave LRDW directional couplers are analyzed. A 3-db, 500 GHz coupler with negligible radiation loss is designed using an interative procedure. This shows that the FDTD technique can be used not only as an analysis method, but also as a design tool which takes into account all high frequency parasitic effects. A matched termination for the LRDW is described and analyzed.

Rectangular-to-Circular Waveguide Transitions for High-Power Circular Overmoded Waveguides
Rectangular-to-Circular Waveguide Transitions for High-Power Circular Overmoded Waveguides

Author: William A. Huting

Publisher:

Published: 1989

Total Pages: 30

ISBN-13:

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Circular overmoded waveguide is being investigated at The Johns Hopkins University Applied Physics Laboratory (JHU/APL) for low loss, high power microwave transmission near 3.0 GHz. Unfortunately, most microwave rather than overmoded circular waveguide. This problem is usually solved by using metallic waveguide transitions. Design objectives for such transitions include high power carrying capability, low mode conversion, low reflectivity, and low transmission loss. An overview of the theory of waveguide transition operation is presented. It is concluded that a prerequisite for a comprehensive waveguide transition analysis is to solve the uniform waveguide problem for the various cross sections of the transition. A review is included that describes some of the difficulties encountered in developing a computer program package that analyzes uniform waveguides with arbitrary cross sections. A overview is included of important waveguide design issues, several proposed designs, and several different tasks and problem areas one might encounter in a long-term study/ (RRH).