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:
Jul. 11, 1978
Filed:
Jun. 20, 1977
James M Alsup, San Diego, CA (US);
Harper J Whitehouse, San Diego, CA (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
An automatic frequency-hop controller for a surface acoustic wave (SAW) shesizer is used with a means for generating two chirp signals, one having a delay with respect to the other. It comprises a SAW device, adapted to receive the chirp signals. The SAW device comprises a substrate and a pair of sets of interdigitated electrodes, disposed on the surface of the substrate, one set at each end, the electrodes receiving the electrical chirp signals or corresponding impulse signals. Another set of interdigitated electrodes, which are output electrodes, are also disposed on the surface of the substrate, the electrodes of all sets being parallel. The output set of electrodes are so disposed as to receive the acoustic waves generated by the pair of sets of electrodes, and transduce them back to electrical signals. For the case when quadrature summation is performed by offset acoustic delays on the substrate, the pair of sets of electrodes and the output set of electrodes are so disposed with respect to each other that the signal received from the top parts of the output set of electrodes has a phase shift of 90.degree., at a frequency f.sub.c, with respect to the phase shift of the signal received from the bottom parts of the output electrodes. The controller further comprises means connected to the output set of electrodes, which selectively controls/mixes the transmission of the electrical signals received from the output set of electrodes. The controlling/mixing means has the capability of transmitting signals from the output set in any sequence, the frequency of the output signal being determined by the particular signal path which is activated. Another embodiment of the invention includes the means for generating the two chirp signals.