High power broadcast transmission system with ferrite circulator
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United States of America Patent
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-
Mar 1, 1994
Grant Date -
N/A
app pub date -
May 8, 1989
filing date -
May 8, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
According to an embodiment of the present invention, a high power RF electric signal transmission system such as a TV broadcast system operating in the range of 100 kW at a UHF band includes one or more high power klystrons whose outputs are combined and fed to the first port of a high power Y-junction three port ferrite circulator, the second port of the circulator feeds the broadcast system radiating antenna system, the third port of the circulator feeds a non-reflecting RF load and means are provided for tuning the circulator to compensate for changes in the temperature of the circulator ferrite material, so that the klystron(s) are isolated from reflections from the antenna system. According to another embodiment, means are provided for selectively coupling the second port of the circulator to the radiating antenna system or to a station load whereby the RF power from the klystrons may be switched from the antenna system to the station load without reflected RF from such switching action flowing to the klystron(s). The invention has particular application to a high power HDTV broadcast system due to the particular requirements of HDTV broadcasting, as more fully described herein.
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