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:
May. 03, 2016
Filed:
May. 22, 2014
Hrl Laboratories, Llc, Malibu, CA (US);
Alexandros D. Margomenos, Pasadena, CA (US);
Miroslav Micovic, Thousand Oaks, CA (US);
Ara K. Kurdoghlian, La Canada, CA (US);
HRL Laboratories, LLC, Malibu, CA (US);
Abstract
A cancellation circuit for a simultaneous transmit and receive system includes a variable attenuator, a variable coarse true time delay a variable fine true time delay, the variable fine true time delay having a cancellation signal output, a circulator coupled to a transmit signal and having a receive signal input and having an output having a sum of the receive signal and a leakage signal, the leakage signal being a portion of the transmit signal leaking through the circulator, a 180° hybrid having a delta output having a difference between the sum of the receive signal and a leakage signal and the cancellation signal, and a control circuit coupled to the delta output and the variable attenuator, the variable coarse true time delay, and the variable fine true time delay to adjust an amplitude and phase of the cancellation signal.