Abstract
Single and multisection branch-line and coupled transmission line (CTL) directional couplers have been implemented in coplanar waveguide (CPW)-technology, showing broadband performances. The branch-line and CTL couplers had a phase balance of ±5° and a power variation of ≤1.5 dB in the coupling over a bandwidth of greater than 25% and 75% respectively. The experimental values for the couplers were found to agree well with simulated results. The CPW couplers provide larger bandwidth than comparable microstrip couplers. Investigation on different feeding structure for the branch-line couplers is also presented.
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Bruce, S., Rydberg, A., Seibt, W. et al. Single and multi-section CTL and branch-line CPW directional couplers with broadband performances for SIMMWIC. Int J Infrared Milli Waves 15, 751–761 (1994). https://doi.org/10.1007/BF02096488
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DOI: https://doi.org/10.1007/BF02096488