| 摘要 |
In an antenna beam control system, in which four antenna elements (31-1 SIMILAR 31-4) are connected to respective first signal processing circuits (33-1 SIMILAR 33-4) to which phase shift circuits (35-1 SIMILAR 35-4) are connected respectively, output signals from the phase shift circuits are combined by a combiner (36), a combined signal is processed by a second signal processing circuit, and phase shift amounts in said phase shift circuits are controlled in accordance with strength information of the signal processed in the second signal processing circuit such that a strength of the signal becomes optimum, characterized in that five combinations of binary signals by means of which five antenna beam patterns (P1-P5) including four antenna beam patterns (P1-P4) each of which is obtained by setting a phase shift amount of respective one of at least four phase shift circuits corresponding to said at least four antenna elements to 180 DEG and setting phase shift amounts of the remaining phase shift circuits to 0 DEG and one antenna beam pattern which is obtained by setting phase shift amounts of all the phase shift circuits corresponding to said at least four antenna elements to 0 DEG are stored, and phase shift amounts of said phase shift circuits are controlled by reading the five combinations of binary signals to find an optimum antenna beam pattern. The antenna beam control system becomes simple in construction, cheap in cost, and is easily realized by an IC chip. <IMAGE> |
