RF transponder system with parallel resonant interrogation serie

Details RF transponder system with parallel resonant interrogation serie RF transponder system with parallel resonant interrogation serie

1996-05-16

1997-03-04

Le, Hoanganh T.

Communications: radio wave antennas

Antennas

Spiral or helical type

343867, 340572, H01Q 136

Patent

active

056084170

ABSTRACT:
A transponder system employs a transponder antenna with a distributed inductance and capacitance that exhibit parallel and series resonant frequencies. Transmissions to the transponder circuit are made at one or more parallel resonant frequencies to maximize the excitation of the transponder circuit, while return signals transmitted back from the transponder are modulated at one or more series resonant frequencies to maximize the signal current. The transponder antenna is implemented as a pair of aligned coils on opposite sides of a thin dielectric substrate, with the coils connected together through the substrate at one point and the substrate thickness not more than about 25 microns to obtain a significant mutual inductance between the coils.

REFERENCES:
patent: 4583099 (1986-04-01), Reilly et al.
patent: 4598276 (1986-07-01), Tait
patent: 4730188 (1988-03-01), Milheiser
patent: 4876555 (1989-10-01), Jorgensen
patent: 5317330 (1994-05-01), Everett et al.
Terman, Radio Enginner's Handbook, McGraw-Hill, 1943, pp. 59-60. no month.

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