Bae Systems Electronics Limited

Marconi Electronic Systems Limited

Balbir Kumar

A device for changing the divergence of a beam of microwave radiation comprises a ferrite body having an aperture through which the beam passes. Magnetic wires pass both through the body and across the aperture, or a magnetic coil on either side of the aperture, causes a differential phase delay as the beam passes through the aperture which broadens or narrows the beam.

Magnetic beam deflection devices

A microwave receiving antenna system ( ) is described which is used to determine an originating direction of microwave radiation. The system has a birefringement phase plate ( ) which splits radiation incident on it into two components which undergo a differential phase delay as they pass through it. The amount of differential phase delay induced varies with angular position around the phase plate ( ) from 0 at an angular position of 0&deg; to &lgr; an angular position of 360&deg;. By determining the differential phase delay (assuming a previously existing relationship) the originating direction of the radiation can be determined.

Radiation receiving apparatus

A beam steerer for steering a microwave beam comprises a body of magnetic material having an aperture and magnetic coils for applying a gradient of magnetization across the aperture. Tapered slots extending from the magnetic coils towards a central region of the aperture are filled with a material having a lower magnetic permeability than the magnetic material of the body. Lower reluctance paths available through the central region of the aperture allow more magnetic flux from the magnetic coils to penetrate through the central region than would be the case in a body of uniform material composition.

Electrical apparatus

An interferometer comprises a non-uniform beam splitter (,) which splits an incoming beam (,) of energy into two beams (,). The two beams (,) are taken from parts of the incoming beam (,) which overlap. The two beams (,) are fed spacially separated energy feeds (,) and then fed to a comparator to produce sum and difference channels (,). The sum and difference channels (,) are guided to a means for detecting a difference in phase (,) between the sum and difference channels (,).

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Wembley, United Kingdom

Balbir Kumar