Interference Cancellation

Radio interference cancellation is a technique in which the interfering radio signal is suppressed by placing a null in radiation pattern of antenna or antenna array systems.

Far Field or Fraunhofer radiation pattern of an antenna is function of current or field distribution over the antenna aperture.

Antenna proximity can be divided to 3 regions; Reactive near field, Radiating /Fresnel near field, and Far Field/Fraunhofer.

Radio communication energy is targeted for Far Field of an Antenna.

The idea of radio interference cancellation via radiation pattern is similar to suppressing an unwanted signal via filter.

In fact, antenna is a “spatial filter”, see?Similarities of Filter vs.?Antenna, posted on August 5th.? This technique assumes that the direction of interfering signal is prior knowledge or dynamically can be detected.

By forming antenna arrays, the radiation pattern of over antenna array can be adjusted dynamically via phase relationship between each antenna feeding.

Alternatively, if the radio interfering signal is placed at side lobe of the radiation pattern, the unwanted signal strength can be adjusted via current or field distribution of antenna array.

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