Patent attributes
A communication apparatus is provided in which only a terminal having a specific positional relationship can perform communication through a relatively simple arrangement. When initial setting is performed or communication is started, a timing calculator calculates a time difference corresponding to the difference between a path from a first antenna to a terminal and a path from a second antenna to the terminal, based on a transmission signal from the first antenna and a reflection signal provided by having the transmission signal reflected from the second antenna or a communication partner, i.e. the terminal, and returned back to the first antenna. Based on the time difference thus calculated, the timing calculator outputs a signal for regulating the transmission timing of transmission data from the first antenna to a variable delay unit. The variable delay unit delays transmission timing of the transmission data depending on the timing regulation signal and outputs the delayed transmission data to a modulator/demodulator.
