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Spurious radiation from microstrip

Spurious radiation from microstrip

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The method of an earlier paper is applied to calculate the disturbances due to a number of discontinuities encountered in typical antenna feed and network structures, such as impedance changes, power dividers, T-junctions, open and short circuits etc., and these are compared for relative radiation. Error estimates due to some secondary effects are calculated and shown to be generally negligible. The process of radiation from an open circuit is studied in detail and it is shown that, although most of the radiation comes from the tip, a substantial amount is radiated and also absorbed to. about a free-space wavelength behind the discontinuity. A method analogous to the induced e.m.f. method is formulated and shown to confirm existing results for radiated power. A distinction is made between the phase centre for radiation, which is usually located at a discontinuity, and the source region for radiation. The two are not coincident and the latter may be quite extensive for microstrip radiations. The results are applied to show how the disturbances can affect the performance of a comb antenna and how they can also be utilised to enhance the efficiency of a strip-end radiator on a thin substrate.

References

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      • L.J. van der Pauw . The radiation of electromagnetic power by micro-strip configurations. IEEE Trans. , 719 - 725
    2. 2)
      • J. Watkins . Radiation loss from open circuited dielectric resonators. IEEE Trans. , 636 - 639
    3. 3)
      • M. Maeda . An analysis of gap in microstrip transmission lines. IEEE Trans. , 390 - 396
    4. 4)
      • J.R. James , P.H. Ladbrooke . Surface wave phenomena associated with open circuit stripline terminations. Electron. Lett. , 570 - 571
    5. 5)
      • L. Lewin . Radiation from discontinuities in strip-line. Proc. IEE , 9 , 163 - 170
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      • P. Benedek , P. Silvester . Microstrip discontinuity capacitances for right-angle bends, T-junctions and crossings. IEEE Trans. , 341 - 346
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