High power broadcast transmission system with ferrite circulator

An RF broadcast signal transmission system including a broadcast antenna and antenna transmission line feeding RF broadcast signals to said antenna, comprising,

• (a) a source of said RF broadcast signals and an output transmission line for said source,
• (b) a ferrite circulator including a junction containing magnetized ferrite material, said junction having first, second and third RF signal ports of which:
• RF signal flow into said first port couples readily to said second port but not to said third port, RF signal flow into said second port couples readily to said third port but not to said first port and RF signal flow into said third port couples readily to said first port but not to said second port,
• (c) said source output transmission line is coupled to said circulator first port,
• (d) a non-reflecting RF load is coupled to said circulator third port,
• (e) an RF station load and
• (f) means coupled to said circulator second port for selectively coupling said antenna transmission line or said RF station load to said second port,
• (g) whereby said source output transmission line is isolated from said antenna transmission line and said station load.

A television broadcast transmission system including a broadcast antenna and antenna transmission line feeding television RF broadcast signals to said antenna, comprising,

• (a) a source of said television RF broadcast signals and an output transmission line for said source,
• (b) a ferrite circulator including a junction containing one or more bodies of magnetized ferrite material in the path of electromagnetic waves of said television RF broadcast signals entering said junction, said ferrite material having non-reciprocal electromagnetic wave propagating characteristics at a gyromagnetic resonance frequency thereof,
• (c) said gyromagnetic resonance frequency, the frequency of said television RF broadcast signals from said source and the orientation of said ferrite bodies being such that said television RF broadcast signals are conducted non-reciprocally through said circulator junction from said source output transmission line to said antenna transmission line,
• (d) said junction having first, second and third RF signal ports of which:
• RF signal flow into said first port couples readily to said second port but not to said third port, RF signal flow into said second port couples readily to said third port but not to said first port and RF signal flow into said third port couples readily to said first port but not to said second port,
• (e) said source output transmission line is coupled to said circulator first port,
• (f) a non-reflecting RF load is coupled to said circulator third port,
• (g) said television RF broadcast antenna transmission line is coupled to said circulator second port and
• (h) means are provided for tuning said circulator including means connected to said bodies of ferrite material for cooling and for heating said bodies to maintain said bodies within a predetermined temperature range.