| 摘要 |
<p>An object of the invention is to provide an antenna apparatus whose directional characteristic can be switched 90 degrees conforming to the communication mode at the same time as the frequency band can be switched in response to the communication mode for application to a multiband radio for covering different communication modes such as voice communications and data communications, and a radio using the antenna apparatus. An antenna apparatus 1 of the invention includes linear radiator 2, 3; a first linear director 4; and first and second linear conductors 5 and 6 connected at one end to the radiator 2, 3 and at an opposite end to the first director 4 through switches 7. The first and second conductors 5 and 6 are disposed symmetrically with respect to an orthogonal plane in the length direction of the radiator, and the radiator 2, 3, the first director 4, the first conductor 5, and the second conductor 6 are switched between a loop state in which they are connected on a loop and a separate state in which they are separate by switching the switches 7.</p> |
