Method of trimming film type antennas

US6133834A · kind A · utility

Assignee

• TEXAS INSTRUMENTS DEUTSCHLAND GMBH · DE

Inventors

• Gerhard Eberth · Unterschleißheim, DE
• Heiner Brenninger · Kranzberg, DE
• Alfons Lichtenegger · Freising, DE
• Christian Ecker · Mainburg, DE
• Adolf Baumann · Ilsenburg, DE
• Wolfgang Ramin · Freising, DE
• Johann Hoffmann · Freising, DE
• Konstantin Aslanidis · Dachau, DE

Key dates

• Filing date: Mar 7, 1998
• Grant date: Oct 17, 2000
• Expiry date: Mar 7, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49004
• WIPO field: Computer technology
• WIPO sector: Electrical engineering

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.