Telecommunications – Wireless distribution system – Receiver for satellite broadcast
Reexamination Certificate
2005-09-06
2005-09-06
Nguyen, Simon (Department: 2685)
Telecommunications
Wireless distribution system
Receiver for satellite broadcast
C455S295000, C455S296000, C455S303000, C375S348000
Reexamination Certificate
active
06941106
ABSTRACT:
A structure for reducing intermodulation interference in satellite signal transmission includes receiving antennas for receiving satellite polarized signals, an RF amplifying system for amplifying and down-converting the received signals, first and second mixers and a first-stage common local oscillator for executing a frequency subtraction, mid-frequency amplifiers and low-pass filters for amplifying and filtering signals output from the first and second mixers to generate a mid-band, a third mixer and a second-stage local oscillator for executing a frequency addition, a band-pass filter for filtering and isolating the resultant signal, and a fourth mixer and a third-stage local oscillator for executing another frequency subtraction, a high-pass filter for filtering the resultant signal to generate another non-repeated optimal mid-band, and a multiplex adder for combining the two mid-bands. Second and third harmonic differences between the second-stage and third-stage local oscillators do not fall in the two mid-bands to avoid intermodulation interference.
REFERENCES:
patent: 5959592 (1999-09-01), Petruzzelli
patent: 6424817 (2002-07-01), Hadden et al.
patent: 6526278 (2003-02-01), Hanson et al.
patent: 2003/0083034 (2003-05-01), Motoyama
Nguyen Simon
Prime Electronics & Statellitcs Inc.
Troxell Law Office PLLC
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