Niitek, Inc.

Licentia Patent-verwaltungs Gmbh

Gunter Wichmann

A method for manufacturing a broadband antenna, such as applicable for a low radar cross-section ground penetrating radar. A conductive film is deposited along a dielectric member, such as by sputtering, in such a manner that the impedance of the conducting film is a continuous function of length along the dielectric member. A sampling circuit is then coupled electrically to the feedpoint.

Method for producing a broadband antenna

An apparatus and method for detecting objects buried beneath the surface of a medium. A plurality of wide-bandwidth antennas, coupled to form an array, is drawn across the surface. Each antenna radiates a plurality of pulses of electromagnetic radiation at periodic intervals of time and receives the plurality of pulses after their interaction with the medium. The return pulses are sampled by a sampling circuit disposed at the feed of each antenna so as to create an equivalent-time pulse signal, and a self-signature of each antenna is subtracted from the equivalent-time pulse signal so as to detect features of objects buried beneath the surface of the medium. A pulse former is provided at the feedpoint of the receiving antenna.

Non-intrusive inspection impulse radar antenna

A device is provided for use in a proximity-type fuze which includes a rectangular wave generator, the output of which is differentiated to provide pulses for exciting an antenna, which pulses are at the same time used to bias one or more diodes to conduction for passing signals reflected by a target to a sawtooth wave generator whose sawtooth output has its magnitude and period controlled by the differentiated pulses, the sawtooth output having its magnitude controlled by the signals reflected from the target and particularly the time relationship of the latter relative to the period of the rectangular wave.

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Heidelberg, Germany

Gunter Wichmann