Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1976-01-12
1977-06-28
Griffin, Robert L.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
325449, 333 26, H04B 126, H03D 714, H02M 520
Patent
active
040328503
ABSTRACT:
A coaxial line has a conductive surrounding shield connected from a first to a second point thereon. The outer conductor of the coaxial line shield is discontinuous at an intermediate point inside the shield so that it has two intermediate ends or terminals therein. A radio frequency signal applied to one end of the electrically unbalanced coaxial line will be supplied on the balanced intermediate terminals through a broadband transformation by the coaxial line with its shield, which constitutes a balun (balancing transformer). The length of each part of the coaxial line, from each intermediate terminal to the first and second points, is preferably one-quarter wavelength at the center frequency of an applied frequency band.
The coaxial line may be used with another coaxial line mounted orthogonally to the first line, with both lines mounted within a common enclosure or shield, thereby to provide a dual balun. The intermediate terminals of the dual balun can be connected to opposite terminals of a four-diode bridge mounted between the baluns, thereby to form a doubly balanced heterodyne converter. A heterodyne output signal is derived at the intermediate terminals of one of the coaxial baluns by means of two quarter wave lines which are connected at their ends remote from the balun to form a heterodyne output terminal. The coaxial balun is capacitively coupled to the joint shield at its first and second points to avoid shorting the heterodyne output circuit.
REFERENCES:
patent: 2606964 (1952-08-01), Gluyas, Jr.
patent: 3656071 (1972-04-01), Woodward
patent: 3818385 (1974-06-01), Mouw
Bookbinder Marc E.
Cole Stanley Z.
Griffin Robert L.
Nelson Richard B.
Stoddard Robert K.
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