Whip antenna of reduced length for VHF radio communication

摘要

A VHF whip antenna of reduced physical length comprising a whiplike electrical conductor mounted atop a hollow, plastic, sealed cylindrical housing having a coaxially mounted circuit support tube mounted therein, with a highly resonant circuit attached thereto. Resonance is achieved in the circuit from a U-shaped inductance of a predetermined length mounted on the inside support tube, the inductance being coupled in series electrically with a variable capacitor. The whip conductor is designed to be three half-wave lengths long and when in combination with the resonant circuit, radiates power in perfect phase relationship that accounts for a power gain in the order of ten DB.