Wednesday, 1 July 2015

The bandwidth limit of a small dipole antenna matching circuit

If we model the antenna as an RC circuits, no matter how sophisticated the matching circuits is, the best bandwidth we can get is given by the formula :
T is gain and R is the real component of antenna impedance and C is the equivalence input capacitance of antenna. This equation suggest that the larger the real component of the antenna impedance, the better bandwidth we can get. And the Larger capacitance, the better bandwidth we can get.


REFERENCE

V. Iyer , S. N. Makarov , D. D. Harty , F. Nekoogar and R. Ludwig  "A lumped circuit for wideband impedancematching of a non-resonant, short dipole or monopole antenna",  IEEE Trans. AntennasPropag.,  vol. 58,  no. 1,  pp.18 -26 2010 
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2 comments:

  1. Unknown24 July 2015 at 04:26

    Is your 0.5m@27Mhz antenna a non-resonant type?

    ReplyDelete
  2. chik man28 July 2015 at 17:15

    yes because 0.5 meter is way shorter than 1/4 wavelength(2.5meter) of 27MHz

    ReplyDelete

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