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Helical antenna apparatus provided with two helical antenna elements, and radio communication apparatus provided with same helical antenna apparatus
Helical antenna apparatus provided with two helical antenna elements, and radio communication apparatus provided with same helical antenna apparatus
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机译:具备两个螺旋状天线元件的螺旋状天线装置以及具有该螺旋状天线装置的无线通信装置
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摘要
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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