RF power combiner using baluns

Details RF power combiner using baluns RF power combiner using baluns

1989-12-12

1991-05-21

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including field effect transistor

330 55, 330295, H03F 326, H03F 368

Patent

active

050178865

ABSTRACT:
An RF power combiner combines the power of several microwave high power FET amplifiers. A plurality of baluns which convert a balanced transmission line to an unbalanced transmission line and have outputs which are 180.degree. out of phase from each other may be connected at the inputs and the outputs of the FETs. This connection allows for very high output power while matching impedances of the input and the output of the power combiner. Additionally, loss in the output circuit can be minimized by connecting equi-phase outputs of the FETs in a parallel/push-pull manner.

REFERENCES:
patent: 4097814 (1978-06-01), Cohn
patent: 4291278 (1981-09-01), Quine
patent: 4305043 (1981-12-01), Ho et al.
patent: 4386324 (1983-05-01), Schellenberg
patent: 4466445 (1984-05-01), Apel
patent: 4549152 (1985-10-01), Kumar
patent: 4588962 (1986-05-01), Saito et al.
patent: 4619001 (1986-11-01), Kane
patent: 4647867 (1987-03-01), Butler et al.
patent: 4647868 (1987-03-01), Mueller
Ikeda, "Development of a Solid State Radio Transmitter with MOS/FET", IEEE Transactions on Broadcasting, vol. BC-26, No. 4, Dec. 1980, pp. 99-112.

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