| 摘要 |
A slotted coaxial antenna design that accomplishes simultaneous DTV and NTSC broadcast with minimal tower windloading is disclosed. In a preferred embodiment, the antenna design includes a VHF slotted coaxial antenna that acts as a framework to house multiple UHF slotted coaxial antennas, wherein the beam tilt of each UHF antenna can be independently adjusted. The one or more UHF slotted coaxial antennas, which each acts as an UHF outer conductor, and the one or more VHF couplers, which surround the VHF inner conductor, configure an arrangement such that the UHF antennas and VHF couplers share a common aperture, namely, the VHF antenna. This antenna design allows for high band VHF/UHF broadcast of DTV and NTSC signals while being easily adaptable to existing slotted coaxial antennas.
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