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:
Aug. 16, 2011
Filed:
Apr. 24, 2007
Kwun Chiu Wan, Kowloon, HK;
Quan Xue, Kowloon Tong, HK;
Kwun Chiu Wan, Kowloon, HK;
Quan Xue, Kowloon Tong, HK;
City University of Hong Kong, Kowloon, HK;
Abstract
A source of radiation comprises a first low frequency oscillatorfor providing a reference signal and a plurality of phase shifterscoupled to the first oscillator. In addition there are a plurality of phase locked loops, each phase locked loop having a respective Voltage Controlled Oscillator (VCO)for outputting a signal. Each phased locked loop is coupled to a respective one of the phase shifters, so that in use each VCO is phase locked to a reference signal which has been phase shifted by a respective one of the phase shifters. In this way the phase of the radiation output by each VCO may be controlled indirectly by controlling the phase shift of the reference signal. In a preferred embodiment the phase shifters are adjustable to shift the phase by an adjustable amount.