Wave transmission lines and networks – Plural channel systems – Having branched circuits
Patent
1984-07-30
1986-07-22
Gensler, Paul
Wave transmission lines and networks
Plural channel systems
Having branched circuits
333101, 333160, 333263, H01P 516, H03H 748
Patent
active
046022279
ABSTRACT:
A television broadcast transmitter includes two power amplifiers or transmitters, a dummy load and an antenna. A noncontacting switching arrangement includes directional couplers or hybrids operated as controllable phase-shifters under the control of pairs of variable reactive terminations. Signals arriving at the antenna or load port by two paths combine in-phase to couple signal to that port, or combine out-of-phase to cancel signal. If the out-of-phase condition is inaccurate, cancellation may be incomplete, resulting in crosstalk. To avoid the need for accurate positioners to position the variable reactive termination at the position providing the desired phase-shift, a particular structure of the reactive termination is used. The reactive termination is a short-circuited coaxial line with an axial gap in the center conductor at a position less than one quarter operating frequency wavelength from the short circuit. The center conductor is hollow around the gap and lined with insulating material, and an elongated conductive slug is actuated to selectively occupy one or two positions within the center conductor, one position remote from the gap whereby a minimum series capacitance results, and the second position straddling the gap, whereby the series capacitance increases. The slug is actuated by a rod passing through the short circuit. The rate of change of phase-shift as a function of actuator position is small near the extremes of actuation positions, whereby errors in actuator position do not affect the phase-shift.
REFERENCES:
patent: 2437067 (1948-03-01), Bingley
patent: 2440269 (1948-04-01), Hargrove
patent: 2774044 (1956-12-01), Silvey et al.
Microwave Engineering by A. F. Harvey, pp. 107-115, published 1963 by Academic Press.
"Principles of Radar" by Reintjes & Coate, published 1952 by McGraw-Hill at pp. 635-636.
NHK Technical Report NHK 8-2-82, entitled "A Crossover-Type System for Switching 10-kW VHF Television Broadcasting Transmitters"--English Language Translation.
Report ITEJ 10-4-82 entitled "A 10-kW VHF Transmitter Using a Continuous Change-Over Switch".
Clark Raymond N.
Schmitz Anthony N.
Gensler Paul
Meise William H.
RCA Corporation
Tripoli Joseph S.
Troike Robert L.
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