Abstract
AbstractTwo broadband compact doubly perforated hybrid couplers have been designed, manufactured, and measured. To improve frequency characteristics and to reduce circuit dimensions, two kinds of perforations have been introduced: the defected ground structures in the ground plane metallization and photonic bandgap cells in the strip metallization. Measurement results show essential miniaturization (∼39% and ∼36%) and enhancement of the bandwidth (∼47% and ∼75 %). © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2149–2152, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24566
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