| 摘要 |
PURPOSE:To disperse a quantized phase error that produces a large side lobe in a specific direction, by supplying the electric power to an array antenna from a waveguide slot antenna with a change of the feeding phase. CONSTITUTION:The output of a signal transmitter 7 is radiated again from element antennas 1a-1n via a waveguide slot array antenna 10, wave receiving antennas 9a-9n and phase shifters 2a-2n. The oscillating amplitude and the phase are controlled by the length (l) and the deflection degree (d) of a slot 13 formed at the antenna 10. Therefore the phase degree of a phase shifter 2i is set at -alpha{i-(n+1)/2}<2m>, and the slot length (l) with which the sum of susceptances of slots 13 is set at 0 is selected so that an input signal is equal to[alpha{i - (n+1)/2}<2m>-betai]B. Here B is the minimum unit phase angle, alpha is a constant, beta is a constant corresponding to the beam scanning angle, (n) is the number of elements of an antenna, (i) is the array number of the element antenna, (m) is a natural number, and[X]B is the digital phase degree quantized with B which is most approximate to X. |
