A compact branch‐line coupler using defected ground structures

A compact branch-line coupler (BLC) with a size reduction of about 70% of a conventional BLC has been introduced. The coupler has been designed using a defected ground structure (DGS). No bonding wire or via holes have been used. The simulation results have been verified by measurement with good agreement. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 386–389, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23118