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In this article, a compact butler matrix for wireless communications is designed and implemented at 2.4 GHz using defected ground structures (DGS).The butler matrix consists of a 3-dB coupler, crossover (0-dB coupler), and phase shifter. The 3-dB coupler and crossover are compacted using T-model of transmission line and DGS. The size of proposed butler matrix is about 35% of a conventional matrix. To verify simulation results, designed matrix has been implanted and measured. Fortunately, there is very good agreement between simulation results and measured results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2294–2298, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25474 [ABSTRACT FROM AUTHOR]

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 [ABSTRACT FROM AUTHOR]