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:
Oct. 02, 2007
Filed:
Jul. 19, 2005
Jeffrey A. Prsha, San Diego, CA (US);
Ray Merewether, La Jolla, CA (US);
Edward Denaci, San Diego, CA (US);
Christoph H. Maier, San Diego, CA (US);
Mark S. Olsson, La Jolla, CA (US);
Jeffrey A. Prsha, San Diego, CA (US);
Ray Merewether, La Jolla, CA (US);
Edward Denaci, San Diego, CA (US);
Christoph H. Maier, San Diego, CA (US);
Mark S. Olsson, La Jolla, CA (US);
Seektech, Inc., San Diego, CA (US);
Abstract
A self-tuning resonator for use in a transmitter apparatus for inducing alternating currents in a buried conductor. The resonator is dynamically tuned at frequencies below 500 kHz by exploiting the inherent voltage-variability of net capacitance in multilayer ceramic capacitors. The transmitter apparatus provides improved efficiency and induced output power suitable for use in a man-portable locator system, providing a very high magnetic field output from a physically small battery-powered resonator at frequencies under 500 kHz. The resonator exhibits a very low equivalent series resistance (ESR) and is adaptively returned to a predetermined resonant frequency responsive to any changes in resonance arising from phenomena such as component heating, thereby supporting very high tank circuit currents from battery-powered source to produce very high magnetic flux output.