Patent ID: 6944436

Claim:
A direct conversion receiver comprising: a first amplifier for amplifying a signal input from an antenna; a mixer for receiving a predetermined reference signal and separating a carrier signal from the signal output from the first amplifier; a local oscillator for supplying the predetermined reference signal to the mixer; a low-pass filter (LPF) for excluding a high-frequency component from the signal output from the mixer; a second amplifier for amplifying the signal output from the LPF; and a shielding ground surface of a substrate structure for preventing self-mixing of signals leaking during which the signal is received by the antenna and processed, wherein the mixer and an element constituting the local oscillator are positioned above the shielding ground surface, and an interconnection connecting the mixer and the element constituting the local oscillator are positioned on one side of the shielding ground surface opposite to the side facing the mixer and element constituting the local oscillator.