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An asymmetrical suspended stripline directional coupler

✍ Scribed by Moriyasu Miyazaki; Yoji Isota; Norio Takeuchi; Osami Ishida

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
540 KB
Volume
81
Category
Article
ISSN
8756-663X

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✦ Synopsis

For a directional coupler using a low-loss suspended stripline, the structure of an asymmetrical suspended directional coupler with medium coupling of 5 dB to 9 dB is proposed and the design method and characteristic of the coupler are discussed. By using an asymmetric suspended stripline in the coupled section, medium coupling, which is difficult to achieve with a branched stripline directional coupler for tight coupling and an edge-coupled stripline directional coupler for weak coupling, can be realized. This type of coupler is advantageous for the supply circuit of a phased-array antenna using suspended striplines.

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## Abstract Design of directional couplers in an inhomogeneous suspended stripline dielectric structure has been comprehensively investigated. A new design procedure of coupled‐line directional couplers has been proposed in which the equalization of inductive and capacitive coupling coefficients is