Method of trimming film type antennas

Details Method of trimming film type antennas Method of trimming film type antennas

1998-03-07

2000-10-17

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

29593, 3405727, G08B 1314

Patent

active

061338346

ABSTRACT:
A method of tuning the resonance frequency of a transponder to a target frequency is described, wherein a transponder comprises a film antenna with an IC (IC) mounted to the film antenna (L) and an integrated resonance capacitor (C) is part of a IC. During testing of IC at chip probe to determine the pass/fail of the IC, the integrated resonance capacitor (C) is measured and the value is stored with the pass/fail data of the wafer map. Then after mounting a passed IC (IC) to a film antenna (L) with variable inductance, retrieve the integrated resonance capacitance value from the wafer map and calculate the amount of inductance necessary to achieve the target frequency. Tune the film antenna (L) to achieve the necessary inductance, measure the transponder resonance frequency, and compare the transponder resonance frequency to the target frequency.

REFERENCES:
patent: 5444223 (1995-08-01), Blama
patent: 5461393 (1995-10-01), Gordon
patent: 5463404 (1995-10-01), Wall
patent: 5495230 (1996-02-01), Lian
patent: 5754110 (1998-05-01), Appalucci et al.

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