Patent ID: 8086202

Claim:
A method for removing coupling and correlation of antennas for diversity reception in which a first antenna and a second antenna are placed so that a distance between one of a part or a feeding point of the first antenna and one of a part or a feeding point of the second antenna is within ½ of a wavelength of a received radio wave, the method comprising: a first placement step for placing: a first sensor in a vicinity of a ground plane of the feeding point of the second antenna; a first amplitude-phase regulator controlling an amplitude and phase of a first pickup signal outputted from the first sensor; a first adder receiving and adding an output signal of the first antenna and an output signal of the first amplitude-phase regulator, and outputting the addition result as an output signal; a first tuner receiving the output signal of the first antenna via the first adder; and a second tuner receiving an output signal of the second antenna, a second placement step for placing: a diversity receiver receiving an output signal of the first tuner and an output signal of the second tuner; and a controller receiving a reception quality signal from the diversity receiver; an amplitude-phase regulation step for allowing the first amplitude-phase regulator to control the amplitude and phase of the pickup signal outputted from the first sensor; a first input step for allowing the first adder to receive and add the output signal of the first antenna and the output signal of the first amplitude-phase regulator as the two output signals and then to output the addition result as an output signal, and for allowing the first tuner to receive the output signal of the first antenna via the first adder; a second input step for allowing the second tuner to receive the output signal of the second antenna; a third input step for allowing the diversity receiver to receive the output signal of the first tuner and the output signal of the second tuner; a combination step for allowing the diversity receiver to combine the output signal of the first tuner and the output signal of the second tuner; a demodulation step for allowing the diversity receiver to perform diversity demodulation using the output signal of the first antenna and the output signal of the second antenna; and a control step for allowing the controller to control the amplitude and phase of the first pickup signal according to the reception quality signal outputted from the diversity receiver so as to control the first amplitude-phase regulator for optimizing the reception quality signal.