A Broadband Compact Microstrip Rat-Race Hybrid Using a Novel CPW Inverter

  title={A Broadband Compact Microstrip Rat-Race Hybrid Using a Novel CPW Inverter},
  author={Ting Ting Mo and Quan Xue and Chi Hou Chan},
  journal={IEEE Transactions on Microwave Theory and Techniques},
A new compact microstrip rat-race hybrid with an octave bandwidth employing a novel frequency-independent coplanar waveguide (CPW) phase inverter is reported in this paper. The 270deg branch of a conventional rat-race is replaced by a -90deg branch, which is realized by a 90deg microstrip line and the CPW phase inverter. A new microstrip-to-CPW transition is introduced for which a lumped-element model is devised to facilitate parameter optimization. The designed transition has an insertion loss… CONTINUE READING
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