Telecommunications – Transmitter – With feedback of modulated output signal
Patent
1988-11-23
1989-09-19
Tarcza, Thomas H.
Telecommunications
Transmitter
With feedback of modulated output signal
455 67, 455115, 330284, 330286, 330 56, 333 81B, H04B 1700, H01P 122, H01P 312, H03F 360
Patent
active
048688894
ABSTRACT:
The nonlinearity of the frequency response of a solid state power amplifier (SSPA) is obviated by effectively operating the SSPA at the 1 dB compression point, where the nonlinearity does not exist, and controllably reducing, downstream of the SSPA, the power output produced by the SSPA to the level required by the link. In particular, the output is reduced by controllably inserting a relatively thin tapered blade of ferrite material into a waveguide coupling section downstream of the SSPA. Preferably the ferrite material is comprised of a robust carbonyl steel of sufficient thickness to withstand the heat induced in the course of its absorbing microwave energy at the SSPA output, while being of a narrow or thin configuration and oriented for insertion into the absorbing section of waveguide so as to not effectively alter the characteristics of the signal profile of the electromagnetic wave.
REFERENCES:
patent: 2898561 (1959-08-01), Hayes
patent: 2981907 (1961-04-01), Bundy
patent: 3624534 (1971-11-01), Clayworth
patent: 3842292 (1974-10-01), Kuno
patent: 4485349 (1984-11-01), Siegel et al.
McGann William E.
Todd John R.
American Telephone and Telegraph Company
AT&T Bell Laboratories
Barron Jr. Gilberto
Pfeifle Erwin W.
Tarcza Thomas H.
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