Differential phase shifters using corrugated,ridge, and fin loaded waveguides |
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Authors: | Angel Mediavilla José A Pereda Oscar González Alicia Casanueva Joseph Helszajn Ralph Levy |
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Affiliation: | 1. Communications Engineering Dept., Universidad de Cantabria, Santander, Spain;2. Dept. of Computing & Electrical Engineering, Heriot‐Watt University, Edinburgh, Scotland;3. R. Levy Associates, La Jolla, CA, USA |
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Abstract: | One means of converting the port conditions of a magic‐tee into those of a 90° hybrid is to introduce external sections of waveguide at the symmetrical H‐plane output ports having the necessary 90° phase difference. The purpose of this article is to describe a number of realizations of such differential phase shifters (DPS), including an exact synthesis procedure not requiring computer optimization. A typical design consists of a capacitively loaded waveguide for one section and an essentially inductive waveguide for the other. The latter is simply a uniform waveguide of reduced width when compared with that of the capacitive section. An example capacitive ridge DPS exhibits a maximum phase error of ±2° over a 20% bandwidth in WR75 waveguide with a return loss of better than 40 dB and an insertion loss <0.06 dB. © 2009 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2009. |
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Keywords: | differential phase shifters waveguides mode matching method |
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