| 摘要 |
A beam forming network for a circular antenna array having N groups of N radiating elements which is coupled to the antenna array through N-1 phase shifters and an NxN Butler matrix, said beam forming network comprising: a power divider network (102, 104,106); a sum pattern generating network (108); a difference pattern generating network (110); and a sum-difference combiner network (112, 114, 116, 118); the various networks are used either alone or in simultaneous combination to provide sum and difference antenna patterns respectively having an omnidirectional side lobe. |
