Ring Hybrid Balun with Good Amplitude and Phase Balance

  title={Ring Hybrid Balun with Good Amplitude and Phase Balance},
  author={Won Na and Jun Ling Song and Il-Hyun Cho and Keun-Kwan Ryu and Moon-Que Lee},
  journal={2007 IEEE/MTT-S International Microwave Symposium},
We present a ring hybrid balun with additional two lambda/4 short stubs, which offers excellent amplitude and phase balance characteristic. In the proposed scheme, the phase and amplitude imbalance essentially occurred in the conventional ring hybrid is alleviated by a lambda/4 shorted stub and the second stub with a series resistor respectively. The measured data shows that phase imbalance is less than 2.5deg and magnitude imbalance is less than 0.2 dB over a 1.75-2.25 GHz. 

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