Abstract
An omnidirectional antenna with controllable nulls is desirable in some communication systems. It can suppress noise caused by stationary or mobile jammers and still maintain an otherwise omnidirectional coverage. A synthesis procedure for omnidirectional radiation patterns with multiple nulls for circular arrays of omnidirectional elements is presented. The depths of the nulls can be controlled individually, and the gain ripple in the omnidirectional pattern can be reduced by the use of a window function in the synthesis procedure. The pattern design is performed by the approximation of an ideal pattern, and results for two different approximation algorithms and two different window functions are presented. It is shown that the element excitations can be corrected for mutual coupling, and the results are verified using the numerical electromagnetics code (NEC).
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