Radio transmitter with active band-pass filtering

Details Radio transmitter with active band-pass filtering Radio transmitter with active band-pass filtering

1994-06-30

1996-08-20

Eisenzopf, Reinhard J.

Telecommunications

Transmitter

Measuring, testing, or monitoring of transmitter

455 76, 455113, 455116, 455125, H03C 162

Patent

active

055488250

ABSTRACT:
A transmitter of a radio communication apparatus includes a voltage controlled oscillator for converting a voltage signal input to the transmitter into a signal having a frequency according to the voltage of the voltage signal, a mixer for mixing a signal having a fixed frequency with the converted input signal and generating a signal for transmission having a frequency at which communication is substantially carried out, a frequency detector for detecting the frequency at which communication is substantially carried out, and a filter for eliminating useless signals that are included in the signal for transmission and have frequencies different from the frequency at which communication is substantially carried out. Signals having frequencies different from the frequency at which communication is substantially carried out are not radiated into space. As a result, this radio communication apparatus does not cause noise in other communication apparatus of the same kind using communication frequencies different from that of this apparatus.

REFERENCES:
patent: 3355667 (1967-11-01), Bruene
patent: 3649909 (1972-03-01), Ort et al.
patent: 4025855 (1977-05-01), Atkinson
patent: 4521913 (1985-06-01), Huber et al.
patent: 4723306 (1986-05-01), Fuenfgelder et al.
patent: 5270669 (1993-12-01), Jokura
patent: 5361403 (1994-11-01), Dent
patent: 5376895 (1994-12-01), Aihara

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