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. 20, 2002
Filed:
Feb. 04, 2000
Bradley Paul Barber, Chatham, NJ (US);
Linus Albert Fetter, Morganville, NJ (US);
George E. Rittenhouse, Holmdel, NJ (US);
Michael George Zierdt, Belle Mead, NJ (US);
Agere Systems Guardian Corp., Orlando, FL (US);
Abstract
The present invention provides a method for tuning a thin film resonator (TFR) filter comprising a plurality of TFR components formed on a substrate. Each of the TFR components has a set of resonant frequencies that depend on material parameters and construction. TFR bandpass filter response for example can be produced by shifting the set of resonant frequencies in at least one of the series branch TFR components so as to establish the desired shape of the bandpass response and the desired performance of the filter. The shifting may be advantageously performed by removing piezoelectric material from the series branch TFR component, providing a TFR filter with bandwidth and attenuation advantages over that conventionally achieved by down-shifting resonant frequency sets of the shunt TFR components by adding metal material. Additionally, the above method can be used to produce a stopband TFR filter with a desired response by removing piezoelectric material from the shunt branch TFR component, to up-shift the shunt TFR components' set of resonant frequencies with respect to the series branch TFR components.