Surveillance devices with multiple capacitors

A surveillance and/or identification device, comprising:

• a) an antenna and/or an inductor on a substrate;
• b) a lower capacitor electrode, on or over the substrate and in electrical contact with the antenna and/or inductor;
• c) a first dielectric film on or over the antenna and/or inductor and the lower capacitor electrode, the first dielectric film having a hole therein exposing a portion of the antenna and/or inductor and an opening therein over the lower capacitor electrode;
• d) a second capacitor dielectric film on the lower capacitor electrode, in the opening in the first dielectric film and having a thickness significantly less than that of the first dielectric film;
• e) an upper capacitor electrode, capacitively coupled to the lower capacitor electrode;
• and
• f) an electrically conducting strap configured to provide electrical communication between the upper capacitor electrode and the antenna and/or inductor.

A method for making a surveillance and/or identification device, comprising:

• a) forming an antenna and/or inductor on a substrate and a lower capacitor electrode in electrical communication with a first end of the antenna/inductor;
• b) forming a thin capacitor dielectric film on at least a first part of the lower capacitor electrode;
• c) forming a thick capacitor dielectric on or over a second part of the lower capacitor electrode, the second part of the lower capacitor electrode not overlapping with the first part thereof, and the thick capacitor dielectric having a thickness significantly greater than that of the thin dielectric film;
• d) forming an upper capacitor electrode on the thin and thick capacitor dielectric films, capacitively coupled to the lower capacitor electrode;
• and
• e) forming an electrically conducting strap configured to provide electrical communication between the upper capacitor electrode and a second end of the antenna/inductor.

A method for making a surveillance and/or identification device, comprising:

• a) forming a first dielectric film on an electrically functional substrate;
• b) forming a plurality of capacitor electrodes on the first dielectric film, the capacitor electrodes being capacitively coupled to the substrate and physically isolated from each other;
• c) forming a second dielectric film on or over the capacitor electrodes, the second dielectric film having holes therein to facilitate electrical connection to the capacitor electrodes;
• and
• d) forming an inductor electrically connected to each of the capacitor electrodes.

A surveillance and/or identification device, comprising:

• a) an electrically conductive substrate;
• b) a first dielectric film on the electrically conductive substrate;
• c) a plurality of capacitor electrodes on the first dielectric film, capacitively coupled to the substrate and physically isolated from each other;
• d) a second dielectric film on or over the capacitor electrodes, the second dielectric film having holes therein;
• and
• e) an inductor electrically connected to the plurality of capacitor electrodes through the holes.