The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 2004
Filed:
Jun. 11, 2002
Steven Edward Huettner, Tucson, AZ (US);
Steven Craig Rein, Oro Valley, AZ (US);
Douglas Richard Baker, Tucson, AZ (US);
Raytheon Company, Waltham, MA (US);
Abstract
A radar system having a tactical mode and a calibration mode includes a transmitter section for providing high-power amplification of an RF pulsed waveform from an exciter during the tactical mode and the calibration mode. A circulator system has an input port connected to an output of the transmitter section and including first, second and third switchable junctions, and a high-power attenuator. The circulator system provides a transmit tactical mode signal path and a transmit calibration mode signal path of virtually identical electrical path lengths for a transmitter output signal, the tactical path passing through the first, second and third junctions in a first direction to an antenna I/O port, the calibration path passing through the first, second and third junctions in a second direction and through the high-power attenuator to an output port. A receiver section is coupled to the output port and includes a receive tactical mode signal path through a low noise amplifier (LNA), mixer, and an intermediate frequency (IF) amplifier to an IF output port for down-converting a radar signal. The receiver section further includes a receive calibration mode signal path through an attenuator which bypasses the LNA and passes through the mixer and IF amplifier to the IF output port.