Richard T Dempsey

US Patent:

55636160, Oct 8, 1996

Filed:

Mar 18, 1994

Appl. No.:

8/210829

Inventors:

Richard C. Dempsey - Chatsworth CA
Daniel W. Drago - Camarillo CA
Carl O. Jelinek - Camarillo CA

Assignee:

California Microwave - Woodland Hills CA

International Classification:

H01Q 1900

US Classification:

343753

Abstract:

Antenna elements and systems and other radio and microwave frequency devices are constructed with a high index of refraction medium having high matched values of relative permeability and relative permittivity, and a low loss tangent. By making the permeability of the transmission medium substantially equal to its relative permittivity, the impedance of the material is matched to that of the surrounding free space or air. By immersing a radiating element in such a material, and/or by using such a material between adjacent radiating elements or between a radiating element and a reflective ground plane, the physical size and/or the spacing of the elements may be substantially reduced without appreciable performance loss, thereby resulting in a more compact device that is particularly desirable for mobile applications. At least one exemplary such material is formed in layers and has electrical properties which are anisotropic and homogeneous and which vary as a function of frequency; the layers of such a material are preferably oriented such that the particular frequencies of radiation propagating through each layer are presented with high matched values of relative permittivity and relative permeability, and low values of dielectric and magnetic loss tangents.

US Patent:

40127427, Mar 15, 1977

Filed:

Dec 29, 1975

Appl. No.:

5/644439

Inventors:

Richard C. Dempsey - Chatsworth CA

Assignee:

International Telephone and Telegraph Corporation - New York NY

International Classification:

H01Q 700

US Classification:

343742

Abstract:

A multimode loop antenna arrangement for generating various radiation/reception patterns, the loop comprises a plurality of peripheral gaps which are fed through hybrid networks or the like for the production of specialized patterns, such as cardioid, mutually orthogonal dipole modes, and combination modes, such as the so-called turnstile configuration. The antenna is basically non-resonant unless separately tuned and is most useful where broadband operation and minimal size and weight are important.

US Patent:

40818039, Mar 28, 1978

Filed:

Nov 20, 1975

Appl. No.:

5/633623

Inventors:

Richard C. Dempsey - Chatsworth CA

Assignee:

International Telephone and Telegraph Corporation - New York NY

International Classification:

H01Q 2126
H01Q 2128

US Classification:

343795

Abstract:

A multioctave, multifunction antenna system including three planar terraces each having four symetrically placed individual turnstile arrays. A first terrace includes turnstile arrays of a first relatively large size, the second terrace is axially spaced therefrom and includes four second individual turnstile arrays of a second size smaller than the first size. A third terrace includes a similar arrangement of four individual turnstile arrays of a third and smallest size. A ground plane for the arrays of the second and third terraces is included in the plane of the next larger arrays, the first terrace having a spaced ground plane in a separate plane. Between the planes of each terrace an absorbing material provides a lossy medium for broadbanding and reduction of the interaction among the arrays of any given terrace with those of the other terraces. The elements or lobes of each dipole of each turnstile is arranged for separate feed, permitting maximum flexibility in respect to the overall mode of operation, i. e. , such as for polarization determination, monopulse, etc.

US Patent:

RE365068, Jan 18, 2000

Filed:

Oct 8, 1998

Appl. No.:

9/168826

Inventors:

Richard C. Dempsey - Chatsworth CA
Daniel W. Drago - Beaver Creek OH
Carl O. Jelinek - Camarillo CA

Assignee:

California Microwave - Woodlane Hills CA

International Classification:

H01Q 1900

US Classification:

343753

Abstract:

Antenna elements and systems and other radio and microwave frequency devices are constructed with a high index of refraction medium having high matched values of relative permeability and relative permittivity, and a low loss tangent. By making the permeability of the transmission medium substantially equal to its relative permittivity, the impedance of the material is matched to that of the surrounding free space or air. By immersing a radiating element in such a material, and/or by using such a material between adjacent radiating elements or between a radiating element and a reflective ground plane, the physical size and/or the spacing of the elements may be substantially reduced without appreciable performance loss, thereby resulting in a more compact device that is particularly desirable for mobile applications. At least one exemplary such material is formed in layers and has electrical properties which are anisotropic and homogeneous and which vary as a function of frequency; the layers of such a material are preferably oriented such that the particular frequencies of radiation propagating through each layer are presented with high matched values of relative permittivity and relative permeability, and low values of dielectric and magnetic loss tangents.

US Patent:

47288051, Mar 1, 1988

Filed:

Nov 10, 1986

Appl. No.:

6/929404

Inventors:

Richard C. Dempsey - Chatsworth CA

Assignee:

California Microwave, Inc. - Woodland Hills CA

International Classification:

H01J 4014

US Classification:

250578

Abstract:

Synaptic antennas or other radio frequency interactive systems variable in response to photon energy stimuli, are provided from a three-dimensional matrix of electrically conductive segments with photoresponsive devices selectively separating numerous adjacent segments from each other and alternatively interconnecting segments with each other in response to photon energy stimuli. Photon energy stimuli supplied to a first array of photoresponsive devices provide a first combination of interconnected segments constituting a first radio frequency interactive configuration in the matrix. Conversely, photon energy stimuli supplied to a second array of the photoresponsive devices provide a second combination of interconnected segments constituting a second radio frequency interactive configuration in the matrix. A third radio frequency interactive configuration in the matrix different from the first and second radio frequency interactive configurations may be provided by supplying photon energy stimuli to a third array of the photoresponsive devices, different from the first and second arrays, to provide a third combination of interconnected segments, and so forth.

Address:

24733 Quigley Cyn Rd, Newhall, CA 91321

Phone:

6617993421

VIN:

WBAFR9C54BC270083

Make:

BMW

Model:

5 SERIES

Year:

2011

Address:

24733 Quigley Cyn Rd, Newhall, CA 91321

Phone:

6617993421

VIN:

1FMFK19548LA02333

Make:

FORD

Model:

EXPEDITION EL

Year:

2008