Multimode radiotelephone

Details Multimode radiotelephone Multimode radiotelephone

1997-02-19

1999-06-22

Vo, Nguyen

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

4551801, 4551901, 4551931, 455323, H04B 138, H04B 126, H04M 100

Patent

active

059152230

ABSTRACT:
A wireless telephone is disclosed having two antennas and associated filters tuned to first and second frequency bands, respectively. A selection device selects one of the antennas under the control of a frequency management device for connection to a transforming circuit. The transforming circuit includes a symmetrizing circuit which receives an asymmetric signal from one of the two antenna. The symmetrizing circuit is tuneable in response to a tuning voltage from a frequency management device. The symmetrizing circuit provides a symmetric output to an amplifier for amplification and subsequent conversion to an intermediate frequency using a mixer and a local oscillator.

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