Structure for preventing intermodulation interference in...

Telecommunications – Wireless distribution system – Receiver for satellite broadcast

Reexamination Certificate

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C455S295000, C455S296000, C455S303000, C375S348000

Reexamination Certificate

active

06944423

ABSTRACT:
A structure for preventing intermodulation interference in satellite transmission is characterized in that a frequency subtraction is executed at a first mixer and a local oscillator on one of the received satellite vertical and horizontal polarized signals to obtain a first mid-band, while a frequency subtraction is executed at a second mixer and a first-stage local oscillator on the other received signal to obtain a reverse-phase signal thereof, and a frequency addition is executed at a third mixer and a second-stage local oscillator on the reverse-phase signal to obtain a second mid-band, and that second and third harmonic differences between a frequency obtained by subtracting the oscillating frequency of the second-stage local oscillator from the oscillating frequency of the first-stage local oscillator and the oscillating frequency of the local oscillators do not fall in the first and the second mid-bands, respectively, and an intermodulation interference is prevented.

REFERENCES:
patent: 6424817 (2002-07-01), Hadden et al.
patent: 2003/0021367 (2003-01-01), Smith
patent: 2003/0083034 (2003-05-01), Motoyama
patent: 2003/0181180 (2003-09-01), Darabi et al.

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