Backward-wave directional coupler with complete coupling and broadband using conventional microstrip and 1D mushroom structure

Jae-Gon Lee,

Jae-Gon Lee

Dept. of Radio Science & Communication Engineering, Hongik University, Seoul 121-791, Korea

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Jeong-Hae Lee,

Jeong-Hae Lee

Dept. of Radio Science & Communication Engineering, Hongik University, Seoul 121-791, Korea

Search for more papers by this author

Jae-Gon Lee,

Jae-Gon Lee

Dept. of Radio Science & Communication Engineering, Hongik University, Seoul 121-791, Korea

Search for more papers by this author

Jeong-Hae Lee,

Jeong-Hae Lee

Dept. of Radio Science & Communication Engineering, Hongik University, Seoul 121-791, Korea

Search for more papers by this author

First published: 27 April 2006

https://doi.org/10.1002/mop.21622

Citations: 5

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Abstract

A new type of backward-wave coupled-line directional coupler with complete coupling and broadband, which is composed of a conventional microstrip and a 1D mushroom structure, is proposed. The 1D mushroom structure is employed for a double negative (DNG) transmission line. The coupler exhibits unusual characteristics such as complex propagation. The complex propagation constant of the coupled mode enables strong coupling due to exponential field decay. The performance of the proposed coupler is verified by c- and π-mode analysis, full-wave simulation, and measurement. The measured coupling level of −0.5 dB with 3-dB fractional bandwidth of 35% and high directivity of 30 dB is achieved. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1293–1296, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21622

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Volume48, Issue7

July 2006

Pages 1293-1296

Backward-wave directional coupler with complete coupling and broadband using conventional microstrip and 1D mushroom structure

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Backward-wave directional coupler with complete coupling and broadband using conventional microstrip and 1D mushroom structure

Abstract

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