Wave transmission lines and networks – Coupling networks – With impedance matching
Patent
1979-06-11
1980-12-30
Gensler, Paul L.
Wave transmission lines and networks
Coupling networks
With impedance matching
333 33, H03H 738, H01P 508
Patent
active
042426510
ABSTRACT:
A first circuit having resistive impedance R.sub.2 is to be electrically matched to a second circuit having resistive impedance R.sub.1 being at least twice as great as R.sub.2. To match them a transmission line transformer is provided with at least one partially reflecting characteristic impedance discontinuity. For instance, two cascaded sections of equal propagation delay length with characteristic impedances Z.sub.1 and Z.sub.2 are able to be employed. Then the input end of the Z.sub.1 transmission line is connected across the first circuit. The Z.sub.2 line has output conductors connected in series with the second circuit across the first circuit. Each line is advantageously wound in the form of a coil around its respective toroidal core. Energy from one of the two circuits acting as a generator passes into each end of the line and is reflected and transmitted at the discontinuity with the remarkable result that for properly selected Z.sub.1 and Z.sub.2, the energy is substantially completely transferred into the other circuit. In other words, the matching is substantially perfect, over orders of magnitude in frequency. The mathematical analysis of the matched conditions shows that a limitation on the high-frequency performance in prior art broadband transformers has been removed in the present apparatus.
REFERENCES:
patent: 3037173 (1962-05-01), Ruthroff
patent: 3037175 (1962-05-01), Ruthroff
patent: 3244998 (1966-04-01), Broadhead, Jr.
patent: 3882432 (1975-05-01), Bowman et al.
Krauss et al., Designing Toroidal Transformers, etc., Electronics, Aug. 16, 1973, pp 113-116.
Ruthroff, Some Broad-Band Transformers, Proc. of IRE, Aug. 1959, pp. 1337-1342.
Collin, Foundations for Microwave Engineering, McGraw-Hill, N.Y., 1966, pp. 221-237.
Tanaka, Improving the Transmission Characteristics of Coaxial 1:-1 Transformers, Electronics & Communications in Japan, vol. 58-c, Nov. 1, 1975, pp. 106-114.
Gensler Paul L.
Hollander James F.
Iowa State University & Research Foundation, Inc.
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