Interference cancelling transmitter

Details Interference cancelling transmitter Interference cancelling transmitter

1983-07-25

1987-06-02

Buczinski, Stephen C.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including directive communication system

455105, H04B 700, H04B 102

Patent

active

H00002887

ABSTRACT:
An interference cancelling transmitter is configured which provides electagnetic compatibility (EMC) among different communications apparatus in the same area as well as providing a low probability of intercept (LPI) in a dense communications environment where secure communications is required between users. This is accomplished by means of a communications transmitter coupled to a transmitting antenna configuration comprised of an omnidirectional antenna and a notch antenna having a single deep null over a small angular beamwidth. RF power is fed equally thereto so that the radiated power from each antenna is the same but the phase is mutually inverted (180.degree.) so that a cancellation of the radiated power occurs in all directions of space except over the angular region where the null of the notch antenna is located. The null can be varied in direction and results in a relatively narrow pencil-like radiation pattern being radiated to a predetermined receiver.

REFERENCES:
patent: 4173748 (1979-11-01), Lewandowski
patent: 4275397 (1981-06-01), Gutleber
patent: 4450448 (1984-05-01), Albanese et al.

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