Patent ID: 8094061

Claim:
A multiband transceiver including means of concurrently performing transmission and reception using two or more different frequencies, the multiband transceiver characterized by comprising: a first local oscillator for generating a first signal having a first frequency; a second local oscillator for generating a second signal having a second frequency; phase-difference setting means for setting a first phase difference between a transmission signal and said first signal; phase-difference detection means for detecting a second phase difference which is the phase difference between a reception signal and said second signal; and calculation means for calculating a distance to a communication counterpart from a third phase difference and a fourth phase difference which are notified by the communication counterpart, and from said first phase difference and said second phase difference, wherein said third phase difference is set to a third signal also having the second frequency by the communication counterpart, and said fourth phase difference is detected between a fourth signal also having the first frequency and said first signal by the communication counterpart.