Image rejection sub-harmonic frequency converter realized in microstrip, particularly adapted to be use in mobile communication equipments

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United States of America Patent

PATENT NO 6738611
SERIAL NO

09508200

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Abstract

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It is described an image rejection, sub-harmonic frequency converter, realized in microstrip, particularly adapted to be used in mobile communication equipment, The converter avails of two identical sub-harmonic mixers employing each one or two pairs of diodes in antiparallel, obtained on a same silica substrate, and of a structure of hybrids performing appropriate phase combination adapted to suppress the image band in the converted signal. The mixers include filtering structures preferably consisting, but no limited to the same, of stubs .lambda./4 long, at the local oscillator frequency, having a free end, in short or open circuit, respectively. According to an alternative embodiment, said stubs are replaced by appropriate filters implemented with concentrated structures (L and C) performing the same transfer function of the stubs in microstrip. The sub-harmonic converter and a traditional converter can be jointly employed in a terminal mobile equipment operating in 'Dual Mode service hand-held' (GSM 900 and DCS 1800) sharing a unique 900 MHz local oscillator.

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Patent Owner(s)

Patent OwnerAddress
NOKIA SIEMENS NETWORKS ITALIA S P AVIA ROMA 108 CAP CASSINA DE PECCHI MI-20060

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Politi, Marco Milan, IT 5 71

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