A method of producing an antenna
AssigneeSarantel Limited
InventorsOliver Paul Leisten, Peter Wileman
Life of this patent
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Abstract
In a method of producing a quadrifilar antenna for circularly polarised radiation at frequencies above 200 MHz, the antenna is tuned by coupling it to a test source, measuring the relative phases and amplitudes of currents at predetermined positions in the individual elements of the antenna by means of probes capacitively coupled to the elements, and laser etching apertures in the elements to increase their inductance, the sizes of the apertures being computed according to the deviation of the measured relative phases from predetermined values.
Claims19
A method of producing a quadrifilar antenna for circularly polarised radiation at frequencies above 200 MHz, the antenna comprising a plurality of substantially helical conductive radiating tracks located on an electrically insulative substrate, wherein the method comprises monitoring at least one electrical parameter of the antenna and removing conductive material from at least one of the tracks to bring the monitored parameter nearer to a predetermined value, thereby to increase the inductance of the track.
A quadrifilar antenna for circularly polarised radiation at frequencies above 200 MHz, comprising a plurality of substantially helical conductive tracks located on an electrically insulative substrate, wherein at least one of the tracks has a cut-out of predetermined size for increasing the inductance of the track.
Dependencies are inferred from the claim text.