Techniques for tuning an antenna to different operating...

Details Techniques for tuning an antenna to different operating... Techniques for tuning an antenna to different operating...

2007-04-10

2007-04-10

Wu, Daniel (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S572800, C343S868000, C343S748000, C343S745000

Reexamination Certificate

active

10917752

ABSTRACT:
Techniques for tuning an antenna to different operating frequencies are described. An apparatus includes a security tag with a substrate having a surface, a lead frame to mount on the surface and connect to an antenna, and an integrated circuit to connect to the lead frame. The antenna may be disposed on the surface, and may comprise a first antenna portion and a second antenna portion. The first antenna portion may connect to the first side and the second antenna portion may connect to the second side. The antenna may be tuned to an operating frequency by modifying a first length for the first antenna portion and a second length for the second antenna portion after the antenna portions are disposed on the surface. Each portion has a first antenna end and a second antenna end, the first antenna end to connect to the lead frame, and the first antenna portion may form an inwardly spiral pattern from the integrated circuit in a first direction, and the second antenna portion may form an inwardly spiral pattern from the integrated circuit in a second direction. Other embodiments are described and claimed.

REFERENCES:
patent: 4560445 (1985-12-01), Hoover et al.
patent: 5109217 (1992-04-01), Siikarla et al.
patent: 5337063 (1994-08-01), Takahira
patent: 6104311 (2000-08-01), Lastinger
patent: 6281794 (2001-08-01), Duan et al.
patent: 6480110 (2002-11-01), Lee et al.
patent: 6535175 (2003-03-01), Brady et al.
patent: 6696952 (2004-02-01), Zirbes
patent: 6806812 (2004-10-01), Cathey

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