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Asymmetric coupled line directional coupler loaded with shunt inductors for directivity enhancement

Asymmetric coupled line directional coupler loaded with shunt inductors for directivity enhancement

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A directivity enhancement technique of shunt-inductive loading is demonstrated for asymmetric coupled line backward-wave directional couplers. Through rigorous normal-mode analysis, the exact condition for isolation zero is derived. Experimental results for a 5 dB coupler at 0.9 GHz show as much as 33 dB improvements in the directivity over its conventional counterpart.

References

    1. 1)
      • P.K. Ikalainen , G.L. Matthaei . Wide-band, forward-coupling microstrip hybrids with high directivity. IEEE Trans. Microw. Theory Tech. , 8 , 719 - 725
    2. 2)
      • R.K. Mongia , I.J. Bahl , P. Bhartia , J. Hong . (2007) RF and Microwave Coupled-line Circuits.
    3. 3)
      • H.-M. Lee , C.-M. Tsai . Dual-band filter design with flexible passband frequency and bandwidth selections. IEEE Trans. Microw. Theory Tech. , 5 , 1002 - 1009
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