Patent ID: 7046960
Filing Date: 2006-05-16
Classification: H04B,H04H

Abstract:
1. A relay apparatus equipped with a function capable of canceling loop operation of a signal between a reception antenna and a transmission antenna, comprising: a subtracting unit for subtracting a duplicated loop signal from a received input signal which is produced by containing loop waves in a desirable wave received via said reception antenna; a relay broadcasting unit for inputting the output signal of said subtracting unit and for outputting a broadcasting signal; a signal processing unit for producing said duplicated loop signal based upon any one of the input signal of said relay broadcasting unit and the broadcasting signal outputted from said relay broadcasting unit; a variable phase shifting unit for varying a phase of said duplicated loop signal which is produced by said signal processing unit; a local oscillation unit for producing a local oscillation frequency signal; a dividing unit for dividing said local oscillation frequency signal; a first frequency converting unit for frequency-converting any one of the wireless frequency signals corresponding to the input signal and the output signal of said relay broadcasting unit into an intermediate frequency signal by using one of said local oscillation frequency signals divided by said dividing unit; and a second frequency converting unit for frequency-converting said duplicated loop signal which is produced by said signal processing unit into a wireless frequency signal by using the other local oscillation frequency signal divided by said dividing unit, wherein a said variable phase shifting unit adjusts the phase of said duplicated loop signal so that a phase error of said duplicated loop signal is corrected, and wherein said variable phase unit is connected to any one output side, or both output sides of said dividing unit.