| 摘要 |
<p>A beam-forming antenna (100) for transmission and/or reception of an electromagnetic signal having a given wavelength in a surrounding medium includes a transmission line (104) electromagnetically coupled to an an-ay of individually controllable antenna elements (102), each of which is oscillated by the signal with a controllable amplitude. The antenna elements are arranged in a linear array and are spaced from each other by a distance that does not exceed one- third the signal's wavelength in the surrounding medium. The oscillation amplitude of each of the individual antenna elements is controlled by an amplitude controlling device (108), such as a switch, a gain-controlled amplifier, or a gain-controlled attenuator. The amplitude controlling devices, in turn, are controlled by a computer that receives as its input the desired beamshape, and that is programmed to operate the amplitude controlling devices in accordance with a set of stored amplitude values derived empirically for a set of desired beamshapes.</p> |
