| 摘要 |
<p>PURPOSE:To reduce the side lobe produced by a quantized phase error at beam scanning by adjusting a phase of an input signal of a phase shifter stepwise as specified with a phase adjuster and setting the phase shifter amount of the phase shifter to a prescribed value. CONSTITUTION:The phase of the input signal to a phase shifter 2i relating to the i-th element antenna 1i is adjusted stepwise by using a phase adjuster 9i based on the phase of an output terminal of a transmitter 7, for example as [-alphar<2m>]D, where alpha is an optional constant, (m) is a natural number, (r) is a distance from the center and [X]D is a value formed stepwise by a step width of D closest to the X. In setting the phase shift amount of the phase shifter 2i as expression I by a control signal from a control circuit 5, the phase of the signal applied to the element antenna 1i is expressed as expression II, where [X]B is a digital phase amount quantized by B closest to the X, beta is a constant corresponding to the beam scannig angle, and B and D are minimum unit phase angles. Thus, the side lobe produced by the quantized phase error at beam scanning is reduced.</p> |
