Willard Fred Henry

US Patent:

6507252, Jan 14, 2003

Filed:

Jun 21, 2001

Appl. No.:

09/886501

Inventors:

Thinh Q. Ho - Anaheim CA 92802
Stephen M. Hart - San Jose CA 95164
Willard I. Henry - San Diego CA 92154

International Classification:

H01P 1213

US Classification:

333135, 333202, 333210

Abstract:

An integrated circuit multiplexer comprises a waveguide having an interior cavity, first RF input port, and a first and second output ports; a dielectric structure positioned in the cavity; an RF input feed attached to the dielectric structure that extends through the RF input port; a first RF output feed attached to the dielectric structure that extends through the first RF output port; a second RF output feed attached to the dielectric structure that extends through the second RF output port; a first resonator pair mounted to the dielectric structure between the RF input feed and the first RF output feed, and electrically connected to the waveguide; and a second resonator pair mounted to the dielectric structure between the RF input feed and the second RF output feed, and electrically connected to the waveguide so that the first and second resonator pairs are generally coplanar. The waveguide is shaped as a right rectangular prism having a rectangular cross-sectional area characterized by a width L and a depth L , where L (0. 5), L (0. 25), and represents the center wavelength of a radio frequency signal that is input into said waveguide so that the waveguide operates in an evanescent mode in response to receiving the radio frequency signal.

US Patent:

58158030, Sep 29, 1998

Filed:

Mar 8, 1996

Appl. No.:

8/614782

Inventors:

Thinh Q. Ho - Anaheim CA
Stephen M. Hart - San Diego CA
Gregory A. Kosinovsky - San Diego CA
Willard I. Henry - San Diego CA

Assignee:

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

International Classification:

H04B 144

US Classification:

455 78

Abstract:

An isolation circulator network includes three circulators and a 180 degree ybrid coupler for isolating an RF transmitter from a nearby RF receiver. The isolation circulator network comprises: a first circulator for transforming a first RF signal, RF. sub. 1, into a second RF signal, RF. sub. 2 and a third RF signal, RF. sub. 3 ; a second circulator for throughputting the third RF signal; a third circulator for transforming the second RF signal into a fourth RF signal, RF. sub. 4, and a fifth RF signal, RF. sub. 5, and for throughputting a sixth RF signal, RF. sub. 6 ; and a 180-degree hybrid coupler which provides a seventh RF signal, RF. sub. 7 in response to receiving the third, fifth, and sixth RF signals, where RF. sub. 7 =(RF. sub. 5 -RF. sub. 3 +RF. sub. 6).

US Patent:

63137135, Nov 6, 2001

Filed:

Sep 28, 1999

Appl. No.:

9/407835

Inventors:

Thinh Q. Ho - Anaheim CA
Stephen M. Hart - San Diego CA
Willard I. Henry - San Diego CA
Gregory A. Kosinovsky - Sunnyvale CA

Assignee:

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

International Classification:

H04B 150

US Classification:

333 11

Abstract:

A matched pair circulator antenna isolation circuit provides isolation between an antenna and one or more receivers and transmitters and may also be applied to other RF devices. A portion of the transmit signal is extracted by a first RF circulator and divided into two phase-inverted signals. The first phase-inverted signal is coupled through a first directional coupler to cancel most of the transmit signal present in the receive signal. The second phase-inverted signal is coupled through a second directional coupler to cancel remaining transmit signal in the output of the first directional coupler. The output of the second directional coupler is coupled to the input of the receiver.