Dwight L Jaggard

US Patent:

53980379, Mar 14, 1995

Filed:

Jan 21, 1993

Appl. No.:

8/006698

Inventors:

Nader Engheta - Strafford PA
Dwight L. Jaggard - Newtown Square PA

Assignee:

The Trustees of the University of Pennsylvania - Philadelphia PA

International Classification:

H01Q 140
H01Q 142
H01Q 1500
H01Q 1524

US Classification:

343872

Abstract:

Antenna structures and chiral radomes solve the aforementioned long-felt needs and provide efficient and multipolarized antenna structures and radomes. In a preferred embodiment, a radome for covering an antenna comprises a chiral medium. In a further preferred embodiment, a method of manufacturing an antenna structure comprising the step of embedding an antenna element in a radome which further comprises a chiral medium is also provided.

US Patent:

51650592, Nov 17, 1992

Filed:

Jul 22, 1991

Appl. No.:

7/734053

Inventors:

Nader Engheta - King of Prussia PA
Dwight L. Jaggard - Newtown Square PA

Assignee:

The Trustees of the University of Pennsylvania - Philadelphia PA

International Classification:

G02B 600

US Classification:

385142

Abstract:

Guided-wave structures comprising chiral materials. Guided-wave structures provided in accordance with this invention comprise chiral materials wherein bifurcated electromagnetic modes are allowed. The guided-wave structures are particularly useful for directional couplers, switches and modulators.

US Patent:

50633910, Nov 5, 1991

Filed:

Jun 6, 1989

Appl. No.:

7/362072

Inventors:

Dwight L. Jaggard - Newtown Square PA
Nader Engheta - King of Prussia PA

Assignee:

The Trustees of the University of Penn. - PA

International Classification:

G01R 2980

US Classification:

343703

Abstract:

Methods of measuring chiral parameters of chiral materials with chiral antennas are provided. These methods involve the use of parallel electric and magnetic dipoles to construct a point sensor in conjunction with the use of a turnstyle antenna as a source. By exciting the chiral medium with the turnstyle antenna, both the absolute degree of chirality and the handedness of the chiral medium can be measured by varying the output currents of the point sensor until a null is achieved. This condition indictes that the ratio p/m, where p is the magnitude of the electric dipole moment and m is the magnitude of the magnetic dipole moment, of the point sensor is. +-. i/v. sub. c. From this relation and knowledge of the relation of permittivity and permeability, the absolute value of the chiral admittance and the chirality factor of the medium can also be found.

US Patent:

52607127, Nov 9, 1993

Filed:

Apr 20, 1992

Appl. No.:

7/871580

Inventors:

Nader Engheta - King of Prussia PA
Dwight L. Jaggard - Newtown Square PA

Assignee:

The Trustees of the University of Pennsylvania - Philadelphia PA

International Classification:

H01Q 1380
H01Q 15240
H01Q 25000

US Classification:

343700MS

Abstract:

Printed-circuit antennas comprising chiral materials. Printed-circuit antennas in accordance with this invention comprise chiral materials wherein two electromagnetic modes are allowed. The printed-circuit antennas are particularly useful for aircraft antennas, communication antennas and smart skins.

US Patent:

50992422, Mar 24, 1992

Filed:

Jan 4, 1990

Appl. No.:

7/461042

Inventors:

Dwight L. Jaggard - Newtown Square PA
Nader Engheta - King of Prussia PA

Assignee:

The Trustees of the University of Pennsylvania - Philadelphia PA

International Classification:

H01Q 1700

US Classification:

342 1

Abstract:

Electromagnetic and optical shields, controllers, and reflectors comprising chiral materials. Electromagnetic and optical controllers and layers provided in accordance with this invention comprise chiral materials wherein reflection, scattering, absorption and shielding properties can be tailored over specified frequency regime. Layered structures have a variety of potential applications in radar cross section management, radar absorbers for low observables and other applications, radomes, antennae, and radio wave, microwave and millimeter wave chambers. Likewise, these structures have many applications to electronic devices, integrated optics, and optical components and systems, as well as in their radio wave, microwave, and millimeter wave counterparts.

US Patent:

20150195047, Jul 9, 2015

Filed:

Jun 19, 2013

Appl. No.:

14/408807

Inventors:

- Philadelhpia PA, US
Nikhil Gulati - Philadelphia PA, US
Kapil R. Dandekar - Philadelphia PA, US
Dwight L. Jaggard - Philadelphia PA, US

International Classification:

H04B 15/00
H04L 27/26
H04B 7/04

Abstract:

By using reconfigurable antenna based pattern diversity, an optimal channel can be realized in order to maximize the distance between two subspaces, thereby increasing sum-rate. The inventors show the benefits of pattern reconfigurability using real-world channels, measured in a MIMO-OFDM interference network. The results are quantified with two different reconfigurable antenna architectures. An additional 47% gain in choral distance and 45% gain in sum capacity were achieved by exploiting pattern diversity with IA. Due to optimal channel selection, the performance of IA can also be improved in a low SNR regime.