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. 24, 2011
Filed:
Sep. 30, 2008
Keith D. Trott, Shrewsbury, MA (US);
Robert V. Cummings, Anaortes, WA (US);
Mark R. Deluca, Methuen, MA (US);
Ronni J. Cavener, Haverhill, MA (US);
Joseph P. Biondi, Townsend, MA (US);
George S. Lafave, Tewksbury, MA (US);
Jeffrey D. Cotton, Sudbury, MA (US);
Keith D. Trott, Shrewsbury, MA (US);
Robert V. Cummings, Anaortes, WA (US);
Mark R. DeLuca, Methuen, MA (US);
Ronni J. Cavener, Haverhill, MA (US);
Joseph P. Biondi, Townsend, MA (US);
George S. Lafave, Tewksbury, MA (US);
Jeffrey D. Cotton, Sudbury, MA (US);
Raytheon Company, Waltham, MA (US);
Abstract
A radio frequency (RF) channelizer includes a first four-port balun, a second four part balun and a pair of filters coupled between the first and second four port baluns. The filters operate such that RF signals having a frequency within a desired frequency band (so-called 'in-band' signals) can propagate between the first and second baluns (e.g. from the first balun to the second balun) while signals having a frequency outside the desired frequency band (so-called 'out-of-band signals') are reflected back to the first balun. One filter reflects out-of-band signals while maintaining the magnitude and phase of the signal (i.e. with a 0 degree phase shift), while the other filter reflects out-of-band signals with a phase-reversal (i.e. with a 180 degree phase shift). With this approach, the reflected signals propagate to a sum port (or even mode port) of the first balun. In this way, the balun-filter combination results in a channelizer which separates signals into different frequency bands.