THO THI NGUYEN
Cosmetology in Fairfax, VA
License number
Virginia 1201082483
Issued Date
Apr 11, 1997
Expiration Date
Apr 30, 2017
Category
Cosmetologist License
Type
Cosmetologist
Address
Address
Fairfax, VA
Professional information
Complete Outdoor Radio Unit For Lmds
US Patent:
6640084, Oct 28, 2003
Filed:
Nov 29, 2000
Appl. No.:
09/725240
Inventors:
Krishna Pande - Gaithersburg MD 20878
Guobao Zheng - Oakhill VA 20171
Tho Nguyen - Chantilly VA 20151
Lee Phelps - Frederick MD 21702
Ali I. Bawangaonwala - Germantown MD 20874
Sunil M. Nagabhushana - Centreville VA 20121
Eric Funk - Annapolis MD 21401
Guobao Zheng - Oakhill VA 20171
Tho Nguyen - Chantilly VA 20151
Lee Phelps - Frederick MD 21702
Ali I. Bawangaonwala - Germantown MD 20874
Sunil M. Nagabhushana - Centreville VA 20121
Eric Funk - Annapolis MD 21401
International Classification:
H04H 100
US Classification:
455 301, 455 76, 455 81, 361688, 361704
Abstract:
The complete outdoor radio unit for LMDS is a light weight, compact transceiver featuring planar circuitry. The transceiver uses cross polarization through an orthomodal transducer and frequency offset between transmit and receive to provide isolation between the transmitter and receiver. The transceiver includes three printed circuit boards directly attached by thermally conductive epoxy to a heat sink which forms part of the antenna dish/transceiver housing for effective heat transfer. Two of the waveguides are used as receiver and transmitter transmission lines into the orthomodal transducer, and two of the waveguides are used as bandpass filters. The transceiver also includes a DCâDC converter in the power supply which is modified to connect the base plate to the heat sink for compactness and improved heat transfer, and a frequency synthesizer with a phase locked loop hardwired to a single reference frequency for compact size.