Abstract: A method determines the three-dimensional position of a playing card at a distance from a gaming table. The method uses modulated signals incorporating different power levels or different frequencies and can be employed as the cards are being dealt or using cards with more than one transponder. The method includes steps of providing each card with at least one transponder that transmits a card identity signal when activated; transmitting an activating signal modulated as to frequency or energy; forming detection zones up to plurality of distances above the gaming table; receiving at a system computer the unique card identity signal; determining a three-dimensional location of the card above the gaming table; recording and displaying the card activity on a computer monitor screen.

Abstract: A radio frequency card tracking system for a gaming table includes a system computer, a deck of playing cards, one or more table antennas, and a transceiver. Each playing card has an antenna, a card identity, and a transponder. Each table antenna has a detection zone at a dealer's card placement position and/or at locations at a gaming table and can transmit and receive radio-frequency signals to and from a card located within the detection zone. The transceiver is coupled with the table antenna and the system computer to provide radio-frequency-energizing signals to the table antenna for transmission to the card located within the detection zone. The transceiver receives card identifying signals from the table antenna and transfers these signals to the system computer. The system computer recognizes the signal duration, receives card identifying signals; determines the card identity associated with the signal, and determines the location of the card.