Helical antenna apparatus provided with two helical antenna elements, and radio communication apparatus provided with same helical antenna apparatus
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United States of America Patent
Stats
-
Oct 19, 2004
Grant Date -
Sep 18, 2003
app pub date -
Feb 21, 2003
filing date -
Feb 22, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a helical antenna apparatus, a first variable capacitance element is connected between a first helical antenna element and a second helical antenna element, and a second variable capacitance element is connected between a first terminal of a balanced port of a balanced to unbalanced transformer and the first helical antenna element. A third variable capacitance element is connected between a second terminal of the balanced port of the balanced to unbalanced transformer and the second helical antenna element. A detector measures a detection voltage Vd corresponding to a reflected power of a reflected signal reflected from the first and second helical antenna elements when the first and second helical antenna elements are fed with a transmission signal from a radio transmitter, and an adaptive controller adaptively controls respective capacitance values of the first to third variable capacitance elements.
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