Jian Qiu Xu

US Patent:

6683513, Jan 27, 2004

Filed:

Oct 24, 2001

Appl. No.:

10/000471

Inventors:

Khosro Shamsaifar - Ellicott City MD
Jian Xu - Clarksville MD

Assignee:

Paratek Microwave, Inc. - Columbia MD

International Classification:

H01P 1213

US Classification:

333135, 333209

Abstract:

A diplexer includes a first tunable bandpass filter connected to a first port, a second tunable bandpass filter connected to a second port, and a coupling element for coupling the first bandpass filter and the second bandpass filter to a third port. Each of the tunable bandpass filters includes a tunable capacitor, wherein a control signal applied to the tunable capacitor controls the transmission characteristic of the filter. The tunable capacitor can be a tunable dielectric varactor or a microelectromechanical variable capacitor. The coupling element can include one of: a circulator, a T-junction, and an orthomode transducer. Each of the first and second filters can comprise a fin line filter including a plurality of tunable dielectric capacitors mounted within a waveguide for controlling the filter transmission characteristics. Fixed bandpass filters can be inserted between each of the tunable bandpass filters and the coupling element.

US Patent:

7437464, Oct 14, 2008

Filed:

Jan 31, 2003

Appl. No.:

10/355264

Inventors:

Jian Xu - Herndon VA, US
Chung-Wen Yuan - North Potomac MD, US

Assignee:

Federal Home Loan Mortgage Corporation - McLean VA

International Classification:

G06F 15/16

US Classification:

709227, 709228, 709229

Abstract:

Systems and methods are provided for providing asynchronous communication between a source processor and a destination processor. In one embodiment, a method includes receiving an information request; making a first call to the destination processor, such that the first call includes the information request; and ending the first call while the destination processor determines an information response, such that said ending terminates a synchronous communication between the source processor and the destination processor. Furthermore, the method includes making a second call to the source processor, such that the second call includes the information response; ending the second call, such that said ending terminates a synchronous communication between the destination processor and the source processor; and providing asynchronously the information response.

Address:

6096 Rock Gln Dr, Elkridge, MD 21075

VIN:

2HNYD28267H525735

Make:

ACURA

Model:

MDX

Year:

2007