Abstract
AbstractThe design of a fixed phase shifter for C‐band applications is presented. The proposed device is composed of two parts: a quadrature 3‐dB directional coupler and the Wilkinson combiner. The quadrature coupler used in the proposed phase shifter is based on the edge‐coupled microstrip lines with a slotted ground plane to make the gap required between the coupled lines feasible. The simulated and measured results of the phase shifter show a 45° ± 5° fixed phase shift across the band 4–8 GHz with less than 1‐dB insertion loss and better than 12‐dB return loss at the centre of the C‐band. The designed device also shows a flat group delay, which enables its use in a narrow pulse transmission/reception and in the high data rate systems. The designed phase shifter has a compact size with dimensions of 30 mm × 30 mm. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 396–399, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23133
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