Xi Shao

US Patent:

8264174, Sep 11, 2012

Filed:

Jul 26, 2010

Appl. No.:

12/843520

Inventors:

Chuan Sheng Liu - Silver Spring MD, US
Xi Shao - Potomac MD, US
Vipin Tripathi - New Delhi, IN

Assignee:

University of Maryland - College Park MD

International Classification:

H05H 15/00
H01J 3/14

US Classification:

315500, 250396 R

Abstract:

A proton acceleration system is provided for accelerating protons within a target. The system includes a laser source generating a laser beam having a wavelength λand intensity and a target formed of foil having a selected thickness. The target is irradiated by the laser beam and transformed into a plasma that has a target density. This causes a treatment energy to be emitted from the foil due to the irradiation. The thickness of the foil of the target is selected so that the foil has a thickness within a range of optimal thickness Δto 2×Δ, wherein Δis less than the laser wavelength and is a function of the laser intensity, laser wavelength, and target density sufficient to achieve radiation pressure acceleration (RPA).

US Patent:

20100026605, Feb 4, 2010

Filed:

May 22, 2009

Appl. No.:

12/470905

Inventors:

BO YANG - MCLEAN VA, US
FELICE M. VANIN - ROMA, IT
XI SHAO - POTOMAC MD, US
QUIRINO BALZANO - ANNAPOLIS MD, US
NEIL GOLDSMAN - TAKOMA PARK MD, US

Assignee:

UNIVERSITY OF MARYLAND - COLLEGE PARK MD

International Classification:

H01Q 1/36
H01P 11/00
H01Q 1/48

US Classification:

343895, 29600, 343848

Abstract:

An F-inverted compact antenna for ultra-low volume Wireless Sensor Networks is developed with a volume of 0.024λ×0.06λ×0.076λ, ground plane included, where λ is a resonating frequency of the antenna. The radiation efficiency attained is 48.53% and the peak gain is −1.38 dB. The antenna is easily scaled to higher operating frequencies up to 2500 MHz bands with comparable performance. The antenna successfully transmits and receives signals with tolerable errors. It includes a standard PCB board with dielectric block thereon and helically contoured antenna wound from a copper wire attached to the dielectric block and oriented with the helix axis parallel to the PCB. The antenna demonstrates omnidirectional radiation patterns and is highly integratable with WSN, specifically in Smart Dust sensors. The antenna balances the trade offs between performance and overall size and may be manufactured with the use of milling technique and laser cutters.