Upconverter

Details Upconverter Upconverter

2008-03-25

2008-03-25

Nguyen, Lee (Department: 2618)

Telecommunications

Transmitter

Frequency conversion

C455S313000

Reexamination Certificate

active

07349676

ABSTRACT:
An upconverter receives an intermediate frequency (IF) modulated signal on a port (5) and a local oscillator carrier signal at a port (6). A comb generator (13-15) generates a comb-like waveform from the carrier signal, the waveform having a peak for each of a number of multiples of the carrier fundamental. A bandpass filter (16) selects one of the comb peaks and there is further multiplication at a quadrupler (20). The modulated signal (IF) and the multiplied carrier are mixed in a mixer (23) to provide a high frequency upper sideband (LO+IF) output. The output is transmitted in a waveguide (7) which is integral with the casing (2, 3) and which performs high frequency filtering by virtue of its shape.

REFERENCES:
patent: 3777271 (1973-12-01), Telewski
patent: 4245355 (1981-01-01), Pascoe et al.
patent: 4412354 (1983-10-01), Hu
patent: 5508661 (1996-04-01), Keane et al.
patent: 6353490 (2002-03-01), Singer et al.
patent: 2002/0118520 (2002-08-01), Baker
patent: WO00/55965 (2000-09-01), None
patent: WO02/07304 (2002-01-01), None

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