Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1995-10-11
1996-11-12
Le, Hoanganh
Communications: radio wave antennas
Antennas
Spiral or helical type
343872, 340572, H01Q 136
Patent
active
055744702
ABSTRACT:
A transponder is formed of a very thin flexible substrate (10) on opposite sides of which are formed first (26) and second (31) series connected halves of a single antenna coil having ends connected to an integrated circuit die (50) mounted to a corner of the substrate. A plurality of bond pads (12a-12e) and programming pads (14a-14e) are also formed on the substrate and operatively connected to couple the antenna coils and the programming pads through the bond pads to the integrated circuit die. Unique configurations and arrangements of a die mounting site (46), bond pads (12a-12e), program pads (14a-14e), and vias (22,24) through the substrate enable an inexpensive simple construction. Protective laminates (58,60) on either side of the substrate are bonded to one another around the edges that circumscribe the substrate and also are bonded to one another at interior portions through a slot (20) formed in the substrate. In one embodiment narrow closely spaced coil turns are grouped in a perimetrical area of the substrate, leaving a large area in the center of the substrate free of antenna coil turns. The thin flexible substrate is stiffened in the area of the die and bond site by thin copper stiffener sheets (46,202,234) that are laid down as part of the antenna coil forming process.
REFERENCES:
patent: 4598276 (1986-07-01), Tait
patent: 4835524 (1989-05-01), Lamond et al.
patent: 4843404 (1989-06-01), Benge et al.
patent: 5059950 (1991-10-01), Perchak
Brown Rodney F.
Le Hoang-anh
Palomar Technologies Corporation
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