Antenna unit

Details Antenna unit Antenna unit

1996-04-25

1996-12-17

Hajec, Donald T.

Communications: radio wave antennas

Antennas

With variable reactance for tuning antenna

343700MS, 343749, 343750, 343850, H01Q 900

Patent

active

055858104

ABSTRACT:
An antenna unit whose resonance frequency is switchable, the antenna unit including an antenna body (11) having a distributed inductance component (L.sub.1), an impedance adjusting inductance component (L.sub.1) and a capacitance (C.sub.1) provided between the same and the ground potential, and a capacitor (C.sub.2) and a diode (D.sub.1) being connected in parallel with the capacitance (C.sub.1) and in series with each other, so that a voltage for bringing the diode (D.sub.1) into an ON or OFF state is applied to a node (16) between the capacitor (C.sub.2) and the diode (D.sub.1), thereby switching the resonance frequency of the antenna unit by switching ON and OFF states of the diode (D.sub.1).

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Patent Abstracts of Japan, vol. 10, No. 20 (E-376) (2077) 25 Jan. 1986 & JP-A-60 182 203 (Hitoshi Tokumaru) (Abstract).
K. Fujimoto, et al., Small Antennas, Research Studies Press Ltd., England, 1987.
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