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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKoichi Ogawa, Hiroshi Iwai, Yoshio Koyanagi
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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.
A helical antenna apparatus connected to one of a balanced feeder line and a balanced port of a balanced to unbalanced transformer of a feeder circuit, said helical antenna apparatus comprising:
A helical antenna apparatus connected to an unbalanced feeder line, and provided on a radio communication apparatus housing, said helical antenna apparatus comprising:
A radio communication apparatus comprising:
A radio communication apparatus comprising:
Dependencies are inferred from the claim text.