Abstract
AbstractA 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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