Patent ID: 7130577

Claim:
A low noise converter receiving first and second polarization signals present in a first frequency band, converting said received first and second polarization signals into first and second intermediate frequency signals, respectively, and outputting said first and second intermediate frequency signals, comprising: first and second local oscillation circuits providing a first local oscillation signal having a first frequency and a second local oscillation signal having a second frequency, respectively; first and second mixer circuits mixing said first and second polarization signals with said first and second local oscillation signals, respectively, and outputting the mixed signals as third and fourth intermediate frequency signals, respectively; and first and second signal filters passing said third and fourth intermediate frequency signals through a second frequency band and a third frequency band, respectively, said third frequency band being higher than said second frequency band, and providing the passed signals as said first and second intermediate frequency signals, respectively, wherein said first and second local oscillation circuits determine said first and second frequencies so that a frequency of n times a first frequency difference between said first and second frequencies is not present in said first to third frequency bands, wherein n includes all natural numbers.