Hoyoung C Choe

US Patent:

20030142015, Jul 31, 2003

Filed:

Jan 30, 2002

Appl. No.:

10/060781

Inventors:

Eric Boe - Long Beach CA, US
Robert Shuman - Torrance CA, US
Richard Young - Lawndale CA, US
Hoyoung Choe - Torrance CA, US
Adam Von - Monterey Park CA, US

International Classification:

H01Q003/22

US Classification:

342/372000

Abstract:

Techniques for maintaining beam pointing for an Electronically Scanned Antenna (ESA) as its frequency is varied over a wide frequency bandwidth. A technique uses discrete phase shifters, a number of stored states, and a control methodology for rapidly switching among the states.

US Patent:

20170150596, May 25, 2017

Filed:

Nov 20, 2015

Appl. No.:

14/947574

Inventors:

- Waltham MA, US
Shea Chen - Plano TX, US
Hoyoung C. Choe - Torrance CA, US

International Classification:

H05K 1/02
H05K 1/11
H01L 25/065
H01L 23/492
H01L 23/498

Abstract:

A stress reduction interposer is provided for disposition between first and second solder materials of first and second electronic devices, respectively. The stress reduction interposer includes a plate element having a central portion and a periphery surrounding the central portion and being formed to define first cavities having an upper area limit at the periphery and a second cavity having a lower area limit, which is higher than the upper area limit, at the central portion and third and fourth solder materials being disposable in the second cavity and in the first cavities, respectively, to be electrically communicative with the first and second solder materials. The third solder material is more compliant and has a higher melting temperature than at least the second and fourth solder materials.