Robert J Pastore

US Patent:

20020047494, Apr 25, 2002

Filed:

Jun 4, 2001

Appl. No.:

09/873499

Inventors:

Jiahua Zhu - Sommerville NJ, US
Yicheng Lu - East Brunswick NJ, US
John Kosinski - Wall Township NJ, US
Robert Pastore - Freehold NJ, US

Assignee:

Rutgers, The State University of New Jersey

International Classification:

H01L041/04

US Classification:

310/31300B, 310/366000

Abstract:

A novel programmable SAW filter with switchable multi-element interdigital transducers (IDTs) controlled by a microprocessor or a computer is provided that realizes the tunability of both center frequency and bandwidth of the SAW filter. The filter possesses the feature of the programmability of both center frequency and 3 dB bandwidth. As an example design, the center frequency of the SAW filter ranges from 126.8 MHz to 199.1 MHz while the 3 dB bandwidth ranges from 18.8 MHz to 58.9 MHz. The multi-input configuration increases the programmability of the device and improves insertion loss. A matching network for the programmable SAW filter further improves insertion loss level and stopband attenuation. A resistance weighting method has been applied to improve in band ripple with the passband ripple being reduced from 6.44 dB to 1.37 dB after resistance weighting. The prototype of programmable SAW filter simplifies the device structure and fabrication process by eliminating the tap weighting and summing circuits, resulting in a smaller device and lower costs. Moreover, frequency response shaping is realized without apodization.

US Patent:

52788547, Jan 11, 1994

Filed:

Sep 18, 1992

Appl. No.:

7/946720

Inventors:

Anderson H. Kim - Toms River NJ
Maurice Weiner - Ocean NJ
Robert J. Youmans - Brick NJ
Robert A. Pastore - Laurence Harbor NJ

Assignee:

The United States of America as represented by the Secretary of the Army - Washington DC

International Classification:

H01S 300

US Classification:

372 38

Abstract:

Bulk gallium arsenide having a high hold-off voltage is optically activated by a laser resulting in high power output. A high voltage input is applied to a semi-insulating gallium arsenide material. The gallium arsenide material is activated by laser light, thereby resulting in large current conduction. An external oscillating signal is superimposed on the high current resulting in a high power output.