Tuning Stability of a Digitally-Tuned, Electrically-Short Monopole Element Mounted on Circular Groundplanes of Different Radii
MITRE CORP BEDFORD MA
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Double and single parameter tuning of a digitally tuned, electrically short monopole antenna at the center of a circular groundplane is investigated to determine the range of groundplane radii for which the same tuning words can be utilized in maintaining a specified antenna gain over a given frequency band. It is found that the range of groundplane radii is generally not significantly larger with double parameter tuning than with single parameter tuning. It is concluded that it may not be possible to use the same tuning words for all groundplane radii of interest without a substantial loss in antenna gain because of mismatch loss at some frequencies, particularly at the low end of the band. Keywords Adaptive tuning words Airborne platforms Antenna gain Antenna mismatch loss Circular ground planes Digitally tuned antenna Double parameter tuning Effect of operating environment Effect of platform size Electrically short element Electronically tuned Impedance matching networks Fixed tuning words Frequency hopping antenna Monopole antenna Radiation efficiency Single parameter tuning Tuning stability Very high frequency.
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