Frequency component measuring device

A frequency component measuring device, comprising:

• a local oscillator capable of performing sweep in a predetermined frequency range;
• a first frequency conversion unit for mixing a local oscillation signal outputted from the local oscillator with a measured signal so as to perform frequency conversion to the measured signal;
• a plurality of intermediate-frequency filters for extracting components of different intermediate frequencies from a signal outputted from the first frequency conversion unit and outputting it;
• an image removal processing unit for performing image removal based on a plurality of intermediate-frequency signals separately outputted from the plurality of intermediate-frequency filters corresponding to each of a plurality of frequency sweep operations performed by the local oscillator;
• and
• a second frequency conversion unit for performing frequency conversion to each of the plurality of intermediate-frequency signals to output a plurality of intermediate-frequency signals having the same frequency, wherein
• the image removal processing unit performs image removal using the intermediate-frequency signals outputted from the second frequency conversion unit,
• wherein the number of the plurality of intermediate-frequency filters is two,
• the second frequency conversion unit comprises:
• a second local oscillator;
• and
• two mixers for mixing a local oscillation signal outputted from the second local oscillator with two intermediate-frequency signals outputted from the two intermediate-frequency filters, and
• supposing that frequencies of the two intermediate-frequency signals outputted from the two intermediate-frequency filters are f1 and f2, the second local oscillator outputs the local oscillation signal having a frequency of (f1+f2)/2.