Wave transmission lines and networks – Coupling networks – Balanced to unbalanced circuits
Patent
1980-01-31
1981-10-13
Gensler, Paul L.
Wave transmission lines and networks
Coupling networks
Balanced to unbalanced circuits
333 32, 333263, H03H 738, H03H 742
Patent
active
042951070
ABSTRACT:
An impedance transformation network includes a trifilar wire configuration in which each of three conductors, each having first and second respective ends, is equally spaced with respect to one another over a predetermined length. A substantial portion of the trifilar wire is surrounded by a ferrite material. The first and second ends of a first conductor are connected to first and second connection points of a first circuit. The first end of a second conductor is connected to a first connection point of a second circuit. The second end of the second conductor is connected to a second connection point of the second circuit. The second end of the second conductor and the first end of the third conductor are connected to a third connection point of the second circuit. Where the second connection point of the first circuit and the third connection point of the second circuit are signal ground points, the network serves as a balun. Where the impedance presented by the second circuit is four times greater than the impedance presented by the first circuit, the characteristic impedance between any two conductors is desirably made equal to twice the impedance presented by the first circuit to provide a one to four impedance transformation ratio. Additional circuitry is provided for extending the impedance transformation ratio of the network and for minimizing its VSWR.
REFERENCES:
patent: 2358520 (1944-09-01), Landon
patent: 2539651 (1951-01-01), Woodward, Jr.
patent: 2709219 (1955-05-01), Schmidt, Jr.
patent: 3373373 (1968-03-01), McClure
Nagle, Use Wideband Autotransformers in RF Systems, Electronic Design 3, Feb. 2, 1976, pp. 64-70.
Emanuel P. M.
Gensler Paul L.
Rasmussen P. J.
RCA Corporation
Whitacre E. M.
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