| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna unit capable of suppressing complication and enlargement in its structure, while alleviating the burden of design of the unit main body to be attached. <P>SOLUTION: A hinge piece (outside of Figure) fixed to a fan-shaped antenna main body (outside of Figure) is axis supported in a turnable fashion, via a hinge axis hole 1a arranged at a basic cylindrical member 1. The basic cylindrical member 1 and a conductive bottom plug 4 are faced each other in the same center line and supported by a device board 2 attached between them. A reactance element 2a and a capacitance element 2b are mounted on the device board 2, and connected in parallel to constitute an impedance matching circuit 11. The impedance matching circuit 11 is connected between the basic cylindrical member 1 and the conductive bottom plug 4, and the conductive bottom plug 4 is connected to an output edge (outside of Figure) at a high-frequency circuit. According to interaction of the impedance matching circuit 11, dual characteristics over UHF bands and VHF bands is acquired. <P>COPYRIGHT: (C)2009,JPO&INPIT |
