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US5235343A High frequency antenna with a variable directing radiation pattern 失效
具有可变导向辐射图案的高频天线

High frequency antenna with a variable directing radiation pattern
摘要:
The present invention relates to an antenna apparatus emitting or receiving high frequency waves and comprising four parasitic vertical rod elements disposed symmetrically to a central vertical rod element and switching elements controlled by a control circuit so that the parasitic rod elements are applied successively and periodically to the ground potential by the control circuit.
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