Compact Low-Profife Electrically Small VHF Antenna.
DEPARTMENT OF THE ARMY WASHINGTON D C
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This report describes an electrically small antenna designed for operation in the 25 to 50 megahertz frequency range which may be constructed in two basic forms. The first embodiment comprises a conductive coil in the form of a copper ribbon that is electroless-plated on a thin cylindrical silicone fiberglass substrate which is loaded with a ferrite core. The loaded coil assembly comprises a radiating element that operates over a metal ground plane. The second embodiment comprises a coiled ribbon conductor which is electroless copper plated directly on a cylindrical ferrite rod surface. The latter embodiment provides closer coupling of the magnetic field into the ferrite. Each embodiment preferably utilizes variable input and output capacitors which are respectively coupled to a source of RF power and to the ground plane. Author
- Electrical and Electronic Equipment