Title: Nose cone capacitively tuned wedge antenna

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Abstract: Disclosed herein is an antenna system for use with small projectile nose es (metal). The antenna comprises a wedge shaped metallized dielectric material having an electrical length equal to one-quarter wavelength as measured inside the center line of the wedge. The metallic coating covering both the top and bottom of the wedge is provided to form a parallel plate radiator. The metallic coating is also extended across the base of the wedge to define an RF short circuit at the base and an open circuit at the apex. An RF coupling probe extending into the wedge is located at a convenient impedance matching point near the base of the wedge. The operating frequency of the antenna may be capacitively tuned (either electrically or mechanically) by means of a variable capacitor connected across the open circuit end (the apex) of the antenna. Typically the dielectric comprises teflon-fiberglass or ceramic material although an air dielectric is also usable. Associated electronic circuitry is located within the nose cone adjacent the wedge antenna utilizing the available open space within the nose cone. Due to the metallic coating which comprises the parallel plate radiator, any electronic circuitry is electrically isolated from the antenna.


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