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Four-element varactor diode loaded polarisation-agile microstrip antenna array

Four-element varactor diode loaded polarisation-agile microstrip antenna array

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Published

A square, varactor diode-loaded polarisation-agile microstrip patch, radiating either circular polarisation (left or right hand) or linear polarisation (in two orthogonal planes) is described. A linear array comprising four such patches has been designed. Measurements show, when operated in circular polarisation, axial ratios better than 0.5 dB and, in linear polarisation, cross-polar levels better than –20 dB.

Inspec keywords: antenna radiation patterns; microstrip antenna arrays; varactors

Other keywords: axial ratio; linear polarisation; circular polarisation; cross-polar level; linear array; varactor diode loaded polarisation-agile microstrip antenna array; square patch

Subjects: Capacitors; Antenna arrays; Junction and barrier diodes

References

    1. 1)
      • P.S. Hall , J.R. James , C. Wood . (1981) Microstrip antenna;Theory and design.
    2. 2)
      • D.H. Schaubert , F.G. Farrar , A. Sindoris , S.T. Hayes . Microstrip antennas with frequencyagility and polarization diversity. IEEE Trans. , 118 - 123
    3. 3)
      • P.M. Haskins , J.S. Dahele . Independent control of resonant frequency and input impedance of a microstrip patch by individually biased varactor diodes. Electron. Lett. , 4 , 284 - 286
    4. 4)
      • P.M. Haskins , J.S. Dahele . Varactor-diode loadedpassive polarisation-agile patch antenna. Electron. Lett. , 13 , 1074 - 1075
    5. 5)
      • P.C. Sharma , K.C. Gupta . Analysis of optimised designof single feed circularly polarized microstripantennas. IEEE Trans. , 6 , 949 - 955
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