Pyong K Park

US Patent:

6384797, May 7, 2002

Filed:

Aug 1, 2000

Appl. No.:

09/629681

Inventors:

James H. Schaffner - Chatsworth CA
Daniel Sievenpiper - Los Angeles CA
Jonathan J. Lynch - Oxnard CA
Robert Y. Loo - Agoura Hills CA
Pyong K. Park - Tucson AZ

Assignee:

HRL Laboratories, LLC - Malibu CA

International Classification:

H01Q 340

US Classification:

343795, 343833, 343754

Abstract:

A multiple band reconfigurable reflecting antenna array and method for multiple band operation and beam steering. An array of dipole antennas is disposed on a multiple band high impedance surface. The antenna array is reconfigured by changing the length of the dipole elements, to thereby change the dipoles resonant frequency. At a given frequency band, small changes in dipole length allow to steer the reflected beam in the selected direction; whether large changes in dipole length permit to switch the operating frequency band. A method of broadening the bandwidth of a high impedance surface is also exposed.

US Patent:

6653984, Nov 25, 2003

Filed:

Apr 3, 2002

Appl. No.:

10/115391

Inventors:

Pyong K. Park - Tucson AZ
Ralston S. Robertson - Northridge CA

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01Q 1310

US Classification:

343770, 343771

Abstract:

A dielectric covered continuous slot (DCCS) antenna operable at RF frequencies. The antenna includes a conical or cylindrical dielectric radome structure having a nominal thickness equal to one quarter wavelength at a frequency of operation of the antenna. A conductive layer is defined on a contour surface of the radome structure, with a plurality of continuous slots defined in the conductive layer. The slots extend circumferentially about the longitudinal axis of the antenna and are spaced apart in a longitudinal sense. A serpentine end-fed signal transmission structure is disposed within the radome structure for carrying RF feed signals from an excitation end of the structure to a second end of the transmission structure. The slots are disposed along the serpentine transmission structure such that energy leaks from the transmission structure through the slots and the radome structure, forming a beam which is scannable in a direction along the longitudinal antenna axis by scanning the transmit signal frequency. Due to the frequency dispersive effective electrical length of the transmission structure, the slot spacing effectively changes as the frequency is scanned, thereby scanning the beam.

US Patent:

6703982, Mar 9, 2004

Filed:

Aug 22, 2001

Appl. No.:

09/935148

Inventors:

Pyong K. Park - Tucson AZ

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01Q 300

US Classification:

343757, 343769

Abstract:

An antenna and antenna excitation method. The inventive antenna includes a cylindrical array ( ) of radiating elements. Each of the elements is mounted at a predetermined substantially transverse angle relative to a longitudinal axis. A circuit ( ) is included for providing an electrical potential between at least two of the elements effective to scan a transmit or a receive beam of electromagnetic energy along an elevational axis at least substantially transverse to the longitudinal axis. In the illustrative embodiment, the array includes a stack of the planar, parallel, conductive, ring-shaped radiating elements, each of which is filled with ferroelectric bulk material. A second circuit ( ) is included for exciting at least some of the elements to cause the elements to generate a transmit or a receive beam of electromagnetic energy off-axis relative to the longitudinal axis. In the preferred embodiment, the second circuit is a Butler matrix and is effective to cause the beam to scan in azimuth about the longitudinal axis, the azimuthal axis being at least substantially transverse to the longitudinal axis and the elevational axis.

US Patent:

6731241, May 4, 2004

Filed:

Jun 13, 2001

Appl. No.:

09/880423

Inventors:

Pyong K. Park - Tucson AZ
Sang H. Kim - Tucson AZ
Joseph M. Anderson - Tucson AZ
Jack H. Anderson - Medford OR
Kevin P. Grabe - Tucson AZ
David Y. Kim - Northridge CA
Richard M. Oestreich - Tuscon AZ

Assignee:

Raytheon Company - Waltham MA

International Classification:

H01Q 1310

US Classification:

342361, 343771

Abstract:

A dual-polarization common aperture antenna having fully populated common aperture dual polarized arrays. The inventive antenna includes a first and second arrays of radiating slots disposed in a faceplate. The second array is generally orthogonal and therefor cross-polarized relative to the first array. The first array is waveguide fed and the second array is stripline fed. In the illustrative implementation, the first array and the second array share a common aperture. The common aperture is fully populated and each array uses the aperture in its entirety. The first and second arrays of slots are arranged for four-way symmetry. Each slot in the first array is a vertically oriented, iris-excited shunt slot fed by a rectangular waveguide and centered on a broad wall thereof. The second array is a standing wave array in which each slot is an air cavity backed slot fed by an inverted micro-stripline offset from a center thereof.

US Patent:

6850128, Feb 1, 2005

Filed:

Dec 11, 2001

Appl. No.:

10/015061

Inventors:

Pyong K. Park - Tucson AZ, US

Assignee:

Raytheon Company - Waltham MA

International Classification:

H01P 503

US Classification:

333 26, 333248, 333 33, 333 24 C, 333261, 333256

Abstract:

An orthogonal electrical coupling relies on electromagnetic coupling for the inner connection, as opposed to direct contact between conductors. A conductor on one of the lines is connected to a ground plane which is adjacent to a resonant slot. Microwave energy is coupled to the slot, thereby exciting the slot. A second conductor is on the opposite side of the ground plane from the first conductor. Microwave energy from the excited resonant slot passes to the second conductor, thereby allowing contactless interconnection between the first conductor and the second conductor. The coupling may emphasize certain modes of propagation relative to other possible modes of propagation. Specifically, the ground plane and slot may be enclosed in a cavity of a size such that the cavity does not support any natural mode propagation inside the cavity. Instead, the coupling may have a cavity in which a transverse electromagnetic (TEM) mode is propagated.

US Patent:

61812919, Jan 30, 2001

Filed:

Mar 24, 1999

Appl. No.:

9/275585

Inventors:

Joseph M. Anderson - Tucson AZ
Pyong K Park - Tucson AZ

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01Q 2100
H01Q 1310

US Classification:

343816

Abstract:

A compact high-performance antenna. The antenna includes a waveguide (16) for providing or receiving electromagnetic energy. A feed circuit (18, 106, 108, 110) provides or receives the electromagnetic energy to or from the waveguide (16). A radiating circuit (112, 114) provides or receives the electromagnetic energy to or from the feed circuit (18). One or more notches (120) in the feed circuit (108, 110) compensate for insertion phase errors in the electromagnetic energy. One or more tabs (18) in the radiating circuit (112, 114) compensate for radiation phase errors in the electromagnetic energy. In a specific embodiment, the antenna is a dipole antenna and includes an array of dipole cards. The radiating circuit (112, 114) includes first (112) and second (114) radiating circuits included in each of the dipole cards (14). The first (112) and second (114) radiating circuits include a plurality of quarter-wave stripline transformers (24).

US Patent:

50795619, Jan 7, 1992

Filed:

Jun 7, 1991

Appl. No.:

7/713028

Inventors:

Pyong K. Park - Agoura Hills CA

Assignee:

Hughes Aircraft Company - Los Angeles CA

International Classification:

H01Q 1310

US Classification:

343771

Abstract:

An array antenna which includes a first waveguide 12 coupled to a second waveguide 20 by an L-shaped coupling slot 30. The slot 30 has a first portion 32 orthogonal to a second portion 34 thereof thereby providing the unique L-shape. In a specific embodiment, the slot 30 is located with the first portion 32 along the centerline and longitudinal axis of the first waveguide 12 and the second portion 34 along the centerline and longitudinal axis of the second waveguide 20. The folded short, as well as the tapered section of prior designs can be eliminated by use of the L-shaped coupling slot of the present invention in the first and last positions of the coupling slot because a short can be placed at the L-shaped slot. Hence, the L-shaped coupling slot of the present invention provides a more compact planar antenna than that afforded by conventional designs.

US Patent:

59631112, Oct 5, 1999

Filed:

Apr 9, 1998

Appl. No.:

9/058106

Inventors:

Joseph M. Anderson - Tucson AZ
Pyong K. Park - Tucson AZ

Assignee:

Raytheon Company - Lexington MA

International Classification:

H01P 508
H01P 512

US Classification:

333128

Abstract:

Apparatus and methods for transitioning between opposite sides of adjacent stripline circuit boards. An orthogonal coaxial connection between opposite sides of the stripline circuit boards is provided wherein a center pin of a coax connector is disposed through the first stripline circuit board and the center trace of one of the stripline circuit boards and through the second board. The center pin is soldered or otherwise electrically attached to a small conductor island pad isolated from the ground plane of the second board and to the plated through hole. The ground of the coaxial connector is connected to the ground plane of the second board adjacent to the isolated conductor island pad.