Rfid devices and methods of making the same

A tunable antenna for an RFID device, comprising:

• a first antenna plate on a first side of a substrate, the first antenna plate including a first plurality of vias that extend through the substrate from the first side of the substrate to a second side of the substrate and are electrically connected to the first antenna plate;
• a second antenna plate on the first side of the substrate and separated from the first antenna plate by a portion of the substrate;
• and
• a third antenna plate on at least the second side of the substrate, the third antenna plate configured to electrically connect the first plurality of vias to the second antenna plate.

A method of manufacturing an RFID device, comprising:

• forming a first antenna plate on a first surface of a substrate;
• forming a second antenna plate on the first surface of the substrate such that the second antenna plate and the first antenna plate are electrically isolated from one another on the first surface;
• forming a first plurality of vias through the substrate at locations on the substrate associated with different operating frequencies of the antenna, the first plurality of vias being electrically connected to the first antenna plate;
• and
• forming a third antenna plate on a second surface of the substrate that is opposite to the first surface such that the third antenna plate electrically connects the first plurality of vias to the second antenna plate.