| 摘要 |
<p>PURPOSE: To provide an antenna for airplane, which adjusts the direction and/or the tilt of an antenna beam with respect to an array antenna which transmits/ receives electromagnetic waves. CONSTITUTION: A part 26a of the antenna consists of excitation circuits 40 and 48 and tuning circuits 44 and 50, which give a prescribed relation of the phase and the amplitude to antenna elements 20, 22 and 24 and can achieve the relation over an operation frequency range. The circuit 40 relays a signal component to elements 20 and 24 through a common voltage point 42, and the circuit 48 functions as a power distribution circuit, which relays a part of the input signal from a terminal 16a to the element 22. A shift means is provided which selectively connects excitation circuits 40 and 48 to the antenna elements, so that this signal component can be shifted to antenna elements.</p> |
