Multiple Interference Null Tracking Array Antenna.
DEPARTMENT OF THE ARMY WASHINGTON DC
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Multiple interference sources are independently acquired, tracked and cancelled in a multi-element antenna array where the number of antenna elements n is an integer power of the base 2, i.e. n 2 to the Mth power where M is the number of sources desired to be cancelled. The antenna elements are selectively coupled to sets of n2 phase shifters in respective closed loop control circuits and operate in phase controlled sets, one for each interference source. The phase of the received signal incident on one half of the elements in each set is independently adjusted relative to the other half, for each desired null in a separate control loop, such that for a particular interfering source each antenna element of the set has one corresponding neighboring element in a pair of elements whose phase mutually differs by 180 deg at the space angle of the arrival of the interference wavefront relative to the axis of the antenna.
- Electrical and Electronic Equipment
- Radiofrequency Wave Propagation