Frederick G Farrar

Author:

Frederick W. Farrar

ISBN #:

0836972619

US Patent:

43792960, Apr 5, 1983

Filed:

Oct 20, 1980

Appl. No.:

6/198673

Inventors:

Frederick G. Farrar - Silver Spring MD
Daniel H. Schaubert - Silver Spring MD

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

H01Q 138

US Classification:

343700MS

Abstract:

An inexpensive, flush mounted selectable mode microstrip antenna which is equency-agile and has polarization diversity. The mode, frequency and polarization of the antenna can be selected by selecting the location of shorting posts in the antenna. The use of switching diodes in place of shorting posts provides the means of electronically switching the mode, frequency and polarization characteristics of the antenna. The selectable mode microstrip antenna arrays are also provided. The selection of mode, frequency and polarization can be selected and controlled by digital means such as a computer.

US Patent:

41624998, Jul 24, 1979

Filed:

Oct 26, 1977

Appl. No.:

5/845528

Inventors:

Howard S. Jones - Washington DC
Frederick G. Farrar - Kensington MD
Daniel H. Schaubert - Silver Spring MD

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

H01Q 138
H01Q 128

US Classification:

343700MS

Abstract:

A dual radiating system where one radiating element is placed atop the ot in a piggyback fashion. The elements can be a pair of microstrip or dielectric-loaded parallel plate radiators, or it can be a combination of the two. Separate coaxial lines feed each of the radiators, and there is a minimum of coupling from one antenna to another. The antenna can be used alone or more effectively in a linear or planar conformal array.

US Patent:

43674747, Jan 4, 1983

Filed:

Aug 5, 1980

Appl. No.:

6/175543

Inventors:

Daniel H. Schaubert - Silver Spring MD
Frederick G. Farrar - Silver Spring MD
Scott T. Hayes - Raleigh NC
Arthur R. Sindoris - Silver Spring MD

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

H01Q 138

US Classification:

343700MS

Abstract:

An inexpensive, flush mounted microstrip antenna which is frequency agile d has polarization diversity. The frequency and polarization of the antenna can be selected by selecting the location of shorting posts in the antenna. The use of switching diodes in place of shorting posts provides the means of electronically switching the frequency and polarization characteristics of the antenna. Frequency-agility provides frequency scannable microstrip antenna arrays which also have polarization diversity. Frequency-agility, polarization diversity and frequency scannable arrays are controllable by digital means such as a computer.

US Patent:

44108915, Oct 18, 1983

Filed:

Aug 11, 1981

Appl. No.:

6/292101

Inventors:

Daniel H. Schaubert - Silver Spring MD
Frederick G. Farrar - Silver Spring MD

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

H01Q 138

US Classification:

343700MS

Abstract:

This invention comprises sn inexpensive, flush-mounted microstrip antenna e polarization of which is easily changed from vertical linear to horizontal linear, left-circular, right-circular or any desired elliptical sense. This enables the designer to select the polarization by selecting the proper location of shorting posts in the antenna. The use of rf switching diodes in place of conventional shorting posts provides a means of electronically switching the polarization.

US Patent:

44853629, Nov 27, 1984

Filed:

Oct 29, 1982

Appl. No.:

6/437607

Inventors:

Morris Campi - Silver Spring MD
Frederick Farrar - Silver Spring MD
Daniel Shames - Silver Spring MD

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

H01P 504

US Classification:

333128

Abstract:

A variable microwave stripline power divider, in which the power seen at h of two outputs can be varied over a wide range without appreciably changing the power seen at the other output. In one embodiment, this is accomplished mechanically by shorting posts connecting the patch member to a ground plane member of the device at selected points. In another embodiment of the invention, this is accomplished electronically by a plurality of electronic switching devices connected between a like plurality of patch member shorting points and a ground plane member, which are selectively activated by a microcomputer.