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Broadband circularly polarised slot loop antenna fed by three-stub hybrid coupler

Broadband circularly polarised slot loop antenna fed by three-stub hybrid coupler

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A microstrip slot loop antenna with a three-stub hybrid coupler feed network is proposed for generating broadband circular polarisation. A very broad bandwidth of 55.6% at 2:1 VSWR and 22.2% bandwidth for < 3 dB axial ratio was achieved.

References

    1. 1)
      • Gipprich, J.W.: `A new class of branch-line directional coupler', IEEE MTT-S Dig., 1993, Atlanta, Georgia, p. 589–592.
    2. 2)
      • R.S. Elliott . (2003) Antenna theory and design.
    3. 3)
      • C. Wood . Curved microstrip lines compact wideband circularly polarized antennas. IEE Proc. MOA , 5 - 13
    4. 4)
      • P.C. Sharma , K.C. Gupta . Analysis and optimized design of single feed polarized microstrip antennas. IEEE Trans. , 949 - 955
    5. 5)
      • P.S. Hall . Microstrip linear array with polarization control. IEE Proc. H , 215 - 224
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