Method for making surveillance devices with multiple capacitors

US8296943B2 · kind B2 · utility

Assignee

• Kovio, Inc. · US

Inventors

• Patrick Smith · San Ramon, US
• Criswell Choi · Sunnyvale, US
• James M. Cleeves · Redwood City, US
• Vivek Subramanian · Redwood City, US
• Arvind Kamath · Los Altos, US
• Steven Molesa · San Jose, US

Key dates

• Filing date: May 15, 2009
• Grant date: Oct 30, 2012
• Expiry date: Nov 30, 2030

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T29/49155
• WIPO field: Control
• WIPO sector: Instruments

Abstract

The present invention relates to surveillance and/or identification devices having capacitors connected in parallel or in series, and methods of making and using such devices. Devices with capacitors connected in parallel, where one capacitor is fabricated with a relatively thick capacitor dielectric and another is fabricated with a relatively thin capacitor dielectric achieve both a high-precision capacitance and a low breakdown voltage for relatively easy surveillance tag deactivation. Devices with capacitors connected in series result in increased lateral dimensions of a small capacitor. This makes the capacitor easier to fabricate using techniques that may have relatively limited resolution capabilities.