David A Willems

US Patent:

6956448, Oct 18, 2005

Filed:

Dec 17, 2002

Appl. No.:

10/320986

Inventors:

David A. Willems - Leo IN, US

Assignee:

ITT Manufacturing Enterprises, Inc. - Wilmington DE

International Classification:

H01P005/18
G01R027/04

US Classification:

333116, 333 33, 324149

Abstract:

In an exemplary embodiment of the present invention, a probe for sampling electromagnetic energy in a circuit is provided. The probe includes a mating portion for mating with a electromagnetic energy transmission media in the circuit. The probe also includes a correction device for correcting impedance mismatch resulting from mating the mating portion with the electromagnetic energy transmission media of the circuit.

US Patent:

7057473, Jun 6, 2006

Filed:

Sep 9, 2005

Appl. No.:

11/223157

Inventors:

David A. Willems - Leo IN, US

Assignee:

ITT Manufacturing Enterprises Inc. - Wilmington DE

International Classification:

H01P 5/18
G01R 27/04

US Classification:

333116, 333 33, 324149

Abstract:

In an exemplary embodiment of the present invention, a probe for sampling electromagnetic energy in a circuit is provided. The probe includes a mating portion for mating, in a broadside configuration, with an electromagnetic energy transmission media in the circuit. The probe also includes a correction device for correcting impedance mismatch resulting from mating the mating portion with the electromagnetic energy transmission media of the circuit.

US Patent:

52785297, Jan 11, 1994

Filed:

Feb 13, 1992

Appl. No.:

7/835767

Inventors:

David A. Willems - Salem VA

Assignee:

ITT Corporation - New York NY

International Classification:

H01P 1203

US Classification:

333204

Abstract:

A broadband microstrip filter structure employs a first transmission line which basically consists of a series of capacitor plates which extend between a dielectric layer from a first location to a second location and each of the series of plates are connected together with a top plate on the top surface of the dielectric and a bottom plate located a given distance beneath the dielectric layer. A second transmission line alternates between the top and bottom layers of the dielectric and consists of a second series of capacitive plates whereby each capacitor is connected to an adjacent capacitor with the top plate of the first connecting to the bottom plate of the second and the bottom plate of the first connecting to the top plate of the second and so on. This pattern is repeated so that the conductor path alternates from the top to the bottom plate. Various capacitors are selected to provide predetermined length resonators while various other capacitors are provided to provide coupling sections.

US Patent:

47149043, Dec 22, 1987

Filed:

Nov 5, 1986

Appl. No.:

6/927774

Inventors:

David A. Willems - Hoagland IN

Assignee:

ITT Aerospace Optical - Fort Wayne IN

International Classification:

H03H 910

US Classification:

333148

Abstract:

A magnetostatic wave device unit in which the magnetic biasing unit includes a carrier member which contains one of the pole pieces and forms an enlarged mechanical and electrical support surface for a magnetostatic wave device.

US Patent:

51720728, Dec 15, 1992

Filed:

Sep 6, 1991

Appl. No.:

7/756080

Inventors:

David A. Willems - Salem VA
Edward L. Griffin - Roanoke VA
Inder J. Bahl - Roanoke VA
Michael D. Pollman - Roanoke VA

Assignee:

ITT Corporation - New York NY

International Classification:

H03F 126

US Classification:

330149

Abstract:

A high efficiency harmonic injection power amplifier has a power amplifier circuit, and at least a second-harmonic termination circuit which is coupled in parallel with the power amplifier circuit so to sample a small portion of the input signal and to inject into the power output signal an amplified harmonic signal which is phase-shifted for proper harmonic termination. The second-harmonic termination circuit includes a frequency multiplier for multiplying the frequency of the sampled input signal to twice the fundamental frequency, i. e. , to 2f. sub. o, an amplifier for amplifying the 2f. sub. o signal to the level of the corresponding harmonic component of the power amplifier output signal, and a phase shifter for shifting the phase of the second-harmonic signal for proper harmonic termination. Additional harmonic termination circuits may be provided for terminating third- and higher-order harmonics.

US Patent:

52819299, Jan 25, 1994

Filed:

Mar 5, 1992

Appl. No.:

7/847752

Inventors:

David A. Willems - Salem VA

Assignee:

ITT Corporation - New York NY

International Classification:

H01P 518

US Classification:

333116

Abstract:

A broadside microstrip coupler employs a first transmission line which consists of a series of capacitor plates which alternate between a dielectric layer from a first location to a second location and each of the series of plates are connected together with a top plate on the top surface of the dielectric and a bottom plate located a given distance beneath the dielectric layer. A second transmission line alternates between the top and bottom layers of the dielectric and consists of a second series of plates where each capacitor is connected to an adjacent plate with the top plate of the first connecting to the bottom plate of the second and the bottom plate of the first connecting to the top plate of the second and so on. This pattern is repeated so that the conductive plate path alternates from the top to the bottom plate. The coupler allows for tight coupling between inputs and outputs and enables the even and odd mode phase velocity differences to be compensated for due to the fact that the odd mode travels between the two conductors and the even mode travels between the conductor and the ground plate.

US Patent:

52627403, Nov 16, 1993

Filed:

Apr 9, 1992

Appl. No.:

7/866148

Inventors:

David A. Willems - Salem VA

Assignee:

ITT Corporation - New York NY

International Classification:

H01P 510
H01P 500

US Classification:

333 26

Abstract:

A transmission line structure operates as a transformer and includes at least two intertwined serpentine planar transmission lines positioned on a substrate with the lines repeatedly crossing each other with said areas of crossing including an airbridge or other structure which physically isolates one line from the other.

US Patent:

53630696, Nov 8, 1994

Filed:

Apr 5, 1993

Appl. No.:

8/042548

Inventors:

Virender K. Sadhir - Roanoke VA
David A. Willems - Roanoke VA
Kenneth S. Karsten - Bethlehem PA

Assignee:

ITT Corporation - New York NY

International Classification:

H03H 703

US Classification:

333 28R

Abstract:

An equalizer circuit for equalizing RF frequencies implemented as an MMIC or MIC having a series of microstrip transmission lines between an RF input terminal and an RF output terminal and having at least one shunt path comprised of a series combination of a FET able to be switched between a conducting state and a nonconducting state and a stud tuner microstrip transmission line, wherein the FET is used as a voltage variable resistor to selectively de-Q the stub tuner and thereby control the depth of the equalization curve. In a modified embodiment, artificial transmission lines which include a plurality of inductive elements and FETs are coupled to each shunt path, wherein the shunt paths may be selectively shorted by changing the state of the FETs, thereby permitting the center frequency of the equalizer circuit to be shifted as well.