Keith Steven Trott

US Patent:

7948332, May 24, 2011

Filed:

Sep 30, 2008

Appl. No.:

12/241338

Inventors:

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

Assignee:

Raytheon Company - Waltham MA

International Classification:

H01P 5/12
H03H 7/42
H03H 7/46

US Classification:

333126, 333134, 333 26

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.

US Patent:

20050007286, Jan 13, 2005

Filed:

Jul 11, 2003

Appl. No.:

10/617620

Inventors:

Keith Trott - Shrewsbury MA, US
Joseph Biondi - Townsend MA, US
Ronni Cavener - Andover MA, US
Robert Cummings - Marlborough MA, US
James McGuinnis - Salem NH, US
Thomas Sikina - Acton MA, US
Erdem Yurteri - Lawrence MA, US
Fernando Beltran - Mashpee MA, US

International Classification:

H01Q013/10

US Classification:

343770000

Abstract:

A radiator element includes a pair of substrates each having a transition section and a feed surface, each of the substrates is spaced apart from one another. The radiator element further includes a balanced symmetrical feed having a pair of radio frequency (RF) feed lines disposed adjacent to and electromagnetically coupled to the feed surface of one of a corresponding one of the pair of transition sections, and the pair of radio frequency feed lines forms a signal null point adjacent the transition sections.

US Patent:

20060038732, Feb 23, 2006

Filed:

Nov 10, 2004

Appl. No.:

10/989231

Inventors:

Mark DeLuca - Methuen MA, US
Robert Cummings - Marlborough MA, US
Keith Trott - Shrewsbury MA, US
Joseph Biondi - Townsend MA, US
Ronni Cavener - Haverhill MA, US

International Classification:

H01Q 19/06

US Classification:

343754000

Abstract:

A dual polarized slotline feed circuit includes a first slotline circuit and a second slotline circuit with the first and second slotline circuits disposed such that first slotline circuit is orthogonal to the second slotline and such that the first and second slotline circuits each have a first portion with a common centerline and wherein a second portion of one of the first and second slotline circuits is bent such that it is disposed at an angle with respect to the common centerline portion of the first and second slotline circuits.