Telecommunications – Transmitter – Having harmonic radiation suppression
Reexamination Certificate
2005-06-08
2008-03-11
Urban, Edward F. (Department: 2618)
Telecommunications
Transmitter
Having harmonic radiation suppression
C455S114200, C455S114300, C455S296000, C332S123000, C332S124000
Reexamination Certificate
active
07343139
ABSTRACT:
The invention relates to a device for converting frequencies comprising a local oscillator of fixed frequency and a first mixer with two inputs and an output, a first input receiving the signal to be converted and a second input receiving the signal arising from the local oscillator. It further comprises a second mixer with two inputs and an output, a first input receiving the signal arising from the phase-shifted local oscillator and the second input receiving a dc signal whose value is dependent on the power of the residual spectral component at the output of an adder receiving as input the signals arising from the first and from the second mixer(s) and giving as output a transposed signal. The invention applies in particular in terminals operating in the Ka band.
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Itoh K., et al.: “Fundamental limitations on output power and conversion loss of an even harmonic mixer in an up-conversion operation” Microwave Sysmposium Digest, 1997, IEE MTT-S International Denver, CO, USA Jun. 8-13, 1997, New York, NY, USA, IEEE, US Jun. 8, 1997, pp. 849-852.
Le Naour Jean-Yves
Lo Hine Tong Dominique
Robert Jean-Luc
Chow Charles
Duffy Vincent E.
Laks Joseph J.
Pugel Michael A.
Thomson Licensing
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