Jeffery L Allen

US Patent:

6622092, Sep 16, 2003

Filed:

Mar 31, 2000

Appl. No.:

09/540438

Inventors:

David F. Schwartz - San Diego CA
J. William Helton - Del Mar CA
Jeffery C. Allen - San Diego CA

Assignee:

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

International Classification:

G06F 1750

US Classification:

702 2, 743741, 367152

Abstract:

A predictor for optimal broadband impedance matching of the present invention computes the maximum value of transducer power gain possible for any impedance matching network for a given transmission line, load, and frequency band.

US Patent:

7058555, Jun 6, 2006

Filed:

May 29, 2002

Appl. No.:

10/157413

Inventors:

David F. Schwartz - San Diego CA, US
J. William Helton - Del Mar CA, US
Jeffery C. Allen - San Diego CA, US

Assignee:

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

International Classification:

G06F 17/50
G01S 15/60

US Classification:

703 2, 703 14, 702117, 367 89, 367152

Abstract:

A predictor for optimal transducer power gain computes the maximum transducer power gain attainable by a lossless matching network for a given load operating over selected non-overlapping (disjoint) sub-bands within a frequency band of operation.

US Patent:

7194390, Mar 20, 2007

Filed:

Jun 11, 2003

Appl. No.:

10/459162

Inventors:

David F. Schwartz - San Diego CA, US
Jeffery C. Allen - San Diego CA, US
J. William Helton - Del Mar CA, US

Assignee:

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

International Classification:

G06F 17/50
G01S 15/60

US Classification:

703 2, 703 14, 702117, 330 54, 333193, 367 89, 367152

Abstract:

A predictor allows the computation of the greatest lower bound of the noise figure pertaining uniformly over the operating band of a wideband amplifier. This computation is done directly from noise-parameter data of the amplifier.

US Patent:

7376535, May 20, 2008

Filed:

Oct 12, 2006

Appl. No.:

11/586743

Inventors:

Jeffery C. Allen - San Diego CA, US
David F. Schwartz - San Diego CA, US

Assignee:

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

International Classification:

H04L 25/00

US Classification:

702182, 702 57, 702 65, 702189, 34031015, 333 173, 379 2701, 375257

Abstract:

A method is provided for determining an optimal performance of a lossless circuit. In one embodiment, the number of inductors and capacitors contained in a circuit of interest are input, and then a random search of a plurality of lossless circuits, each having the same number of inductors and capacitors, is conducted. Then, the electrical load used by the circuit of interest is input into each of the plurality of lossless circuits. The method then searches for a circuit of the plurality of lossless circuits having the smallest mismatch between the electrical load and the circuit's input reflectance. The circuit having a lowest mismatch between the input electrical load and the circuit's input reflectance is then determined.

US Patent:

7614021, Nov 3, 2009

Filed:

May 22, 2007

Appl. No.:

11/752034

Inventors:

Jeffery C. Allen - San Diego CA, US

Assignee:

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

International Classification:

G06F 17/50

US Classification:

716 1, 716 4

Abstract:

A method of determining an amplifier performance is provided. One embodiment establishes a number of amplifier performance constraints. A search is then conducted for an input and an output disk that satisfy the amplifier performance constraints. A vector index is then generated that includes a load reflectance Sand a generator reflectance Sat a number of different radio frequencies. The amplifier performance constraints are then input into the vector index and the load reflectances Sand generator reflectances Sthat meet the amplifier performance constraints are determined.

US Patent:

7719384, May 18, 2010

Filed:

Sep 25, 2008

Appl. No.:

12/237592

Inventors:

Diana Arceo - San Diego CA, US
John W. Rockway - San Diego CA, US
Jeffery C. Allen - San Diego CA, US
Jeffery Young - Moscow ID, US

Assignee:

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

International Classification:

H03H 7/01
H01P 1/32

US Classification:

333132, 333 11

Abstract:

A system includes more than one subsystem, each subsystem operating within a different subsystem frequency range, the subsystems comprising a circulator having three or more circulator ports and a direction of circulation, the circulator operating within a specific frequency range of the subsystem frequency range, and a filter, such as a bandpass filter, connected to at least one of the circulator ports. The filters each define a subsystem port and operate within the specific frequency range. Each subsystem port has a port index determined by the direction of circulation of the circulator within the subsystem. Each subsystem port has a specific port index that is connected to a common port having the specific port index. At least one of the circulator ports may be terminated to a matched load. Each subsystem circulator may comprise at least three circulator ports, with a filter connected to each of the circulator ports.

US Patent:

7816995, Oct 19, 2010

Filed:

Mar 6, 2009

Appl. No.:

12/399316

Inventors:

Jeffery C. Allen - San Diego CA, US
John W. Rockway - San Diego CA, US
Diana Arceo - San Diego CA, US
Jeffery Young - Moscow ID, US

Assignee:

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

International Classification:

H01P 1/32
H01P 1/38

US Classification:

333 11, 455 73

Abstract:

A system includes a first circulator, a second circulator connected to the first circulator and a load, a third circulator connected to the second circulator, and a filter connected between the first and third circulators. The filter modifies the phase and amplitude of a first signal from the first circulator to produce a modified first signal. The modified first signal amplitude may be equal to the amplitude of a second signal from the second circulator. The phase of the modified first signal is about 180 degrees out of phase with the second signal phase. The third circulator circulates the modified first signal towards the second circulator. The first signal comprises a coupled signal from the first circulator. The second signal comprises a signal reflected from the load and a coupled signal from the second circulator. The filter may be a passive network having lumped, distributed, and resistive elements.

US Patent:

7934190, Apr 26, 2011

Filed:

Sep 25, 2008

Appl. No.:

12/238353

Inventors:

Jeffery C. Allen - San Diego CA, US
David F. Schwartz - San Diego CA, US

Assignee:

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

International Classification:

G06F 17/50

US Classification:

716132, 716111, 716119, 716136, 703 16

Abstract:

A method includes generating at least one matrix representing a two-port, generating gain, noise, and stability functions of a system comprising the two-port, a generator connected to one port of the two-port, the generator having a generator reflectance, and a load connected to the other port of the two-port, the load having a load reflectance, and optimizing the gain, noise, and stability functions. The two-port comprises a non-reactive multi-port modeled by an orthogonal matrix, and at least one amplifier connected to the non-reactive multi-port. The orthogonal matrix is parameterized using an exponential map of skew-symmetric matrices having components restricted to an interval from −π to π. The gain, noise, and stability functions are generated using the generated matrix, the generator reflectance, and the load reflectance, The gain, noise, and stability functions are parameterized by the skew-symmetric matrices.