Patent ID: 7102523

Claim:
A radio frequency identification (RFID) tag device, comprising: a substrate; an integrated circuit (IC) die mounted to, said substrate, said IC die having first and second radio frequency (RF) input pads; a first antenna formed on said substrate, and coupled to said first RF input pad; and a second antenna formed on said substrate, and coupled to said second RF input pad; wherein said IC die comprises a first modulator, a second modulator, a first charge pump, and a second charge pump; wherein said first modulator is coupled to said first RF input pad, wherein said first modulator is configured to backscatter modulate a first symbol received from said first RF input pad with a response symbol, wherein said first modulator is configured to output said backscatter modulated first symbol to said first RF input pad; wherein said second modulator is coupled to said second RF input pad, wherein said second modulator is configured to backscatter modulate a second symbol received from said second RF input pad with the response symbol, wherein said second modulator is configured to output said backscatter modulated second symbol to said second RF input pad; wherein said first charge pump is coupled to said first RF input pad, said first charge pump configured to convert a first high frequency signal from said first RF input pad to a first substantially direct current (DC) voltage; wherein said second charge pump is coupled to said second RF input pad, said second charge pump configured to convert a second high frequency signal from said second RF input pad to a second substantially direct current (DC) voltage; and wherein said first antenna is configured to operate in a first frequency band and said second antenna is configured to operate in a second frequency band, wherein said first frequency band is different from said second frequency band.