Transmitter of wireless system and high frequency power amplifie

Details Transmitter of wireless system and high frequency power amplifie Transmitter of wireless system and high frequency power amplifie

1998-04-06

1999-05-04

Vo, Nguyen

Telecommunications

Transmitter

Having harmonic radiation suppression

455107, 455127, 455129, 330295, H04B 104, H03F 360, H03F 368

Patent

active

059013451

ABSTRACT:
The output of a digital modulator is put into a power amplifying device, is distributed into n pieces in an n-power divider in the power amplifier, passes through n input phase shifters differing individually in the phase change amount, is amplified by n power amplifiers, passes through n output phase shifters to match the phase of n signals, is combined in an n-power combiner, and is issued from an output terminal to a phase shifter, and the output of the phase shifter is issued to a transmission antenna. Herein, the phase value of the phase shifter is determined so as to extend the region of the output load impedance for satisfying the specific value of unwanted radiation, and so that the output load impedance range of the load impedance of the power amplifier may be optimize to the impedance change range of the trans missionantenna, thereby eliminating the isolator and presenting a transmitting device of a portable wireless system realizing smaller size, higher performance, and lower cost of portable wireless system.

REFERENCES:
patent: 4477781 (1984-10-01), Reuss, Jr.
patent: 4803443 (1989-02-01), Takagi et al.
patent: 4930035 (1990-05-01), Viana et al.
patent: 5055798 (1991-10-01), Heinzelmann
patent: 5335368 (1994-08-01), Tamura
patent: 5423074 (1995-06-01), Dent
patent: 5661434 (1997-08-01), Brozovich et al.
patent: 5770970 (1998-06-01), Ikeda et al.
patent: 5778308 (1998-07-01), Sroka et al.

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