Patent ID: 6573864
Filing Date: 2003-06-03
Classification: H01Q,H04B

Abstract:
A receiver comprising:a phased array antenna section including a plurality of antenna elements each receiving a radio signal, a plurality of phase varying circuits for controlling phases of the respective signals received by said antenna elements to desired different phases, and a signal combiner for combining output signals of said plurality of phase varying circuits; a direct conversion demodulating section including a local signal generating circuit for generating a local signal of predetermined frequency, generating means for receiving a combined received signal, which is supplied from said signal combiner of said phased array antenna section, or a calibration signal and the local signal from said local signal generating circuit, for generating two signals having a phase difference therebetween based on at least one of the signals received by said generating means, and for outputting at least one signal, at least one power detecting circuit for receiving the signal outputted from said generating means and detecting a level of the signal received from the same, and a conversion circuit for, in a reception mode, converting the output signal of said power detecting circuit to a plurality of signal components, which are contained in the received signal or the local signal, based on set values of circuit parameters, and for, in a non-reception mode in which signals are not received, determining the values of said circuit parameters based on the output signal of said power detecting circuit and then correcting said circuit parameters to the determined values; and a switch circuit for, in the reception mode, applying the combined received signal outputted from said signal combiner of said phased array antenna section to said direct conversion demodulating section, and for, in the non-reception mode, applying the calibration signal to said direct conversion demodulating section instead of the combined received signal outputted from said signal combiner of said phased array antenna section.