Broadcast antenna system with high power aural/visual self-diplexing capability

Claim 1

A television broadcasting system, comprising: a source of UHF visual signal to be broadcast; a source of UHF aural signal to be broadcast, said aural signal being associated with said UHF visual signal; a slotted-circular-waveguide UHF antenna for broadcasting UHF television signals applied to a circular-waveguide input port; a tower upon which said antenna is mounted for achieving wide coverage; a turnstile junction having first and second pairs of orthogonal rectangular-waveguide input ports, said first pair of input ports comprising first and second ports, and said second pair of ports comprising third and fourth ports, and turnstile junction also comprising a circular waveguide port orthogonal to said first an second pairs of rectangular-waveguide ports; first rectangular waveguide means coupled to said source of visual signal and to said first rectangular-waveguide port of said turnstile junction for coupling said visual signal to said turnstile junction; second rectangular-waveguide means coupled to said source of aural signal and to said second rectangular-waveguide port of said turnstile junction for coupling said aural signal to said turnstile junction; reactive terminating means coupled to said second pair of rectangular-waveguide ports of said turnstile junction for causing said turnstile junction to propagate said visual signal to said circular waveguide port of said turnstile junction with a first direction of first and second directions of circular polarization and for causing said turnstile junction to propagate said aural signal to said circular-waveguide port with said second direction of circular polarization; and a circular waveguide coupled at a first end to said input port of said antenna and extending along the length of said tower, and coupled at a second end to said circular-waveguide port of said turnstile junction for coupling said visual and aural signals from said turnstile junction to said antenna with said first and second directions of circular polarization, respectively, whereby said slotted-circular-waveguide antenna broadcasts said UHF visual signal and said associated UHF aural signal.