WIDE RANGE TUNABLE TRANSMITTING LOOP ANTENNA
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Abstract
THIS SPECIFICATION DISCLOSED A LOOP ANTENNA WHICH EMPLOYS A NVEL AND UNIQUE FEED SCHEME PERMITTING A TUNING RANGE OF UP TO 10:1 WITH A NEARLY CONSTANT INPUT IMPEDANCE AND HIGH EFFICIENBY. THE ANTENNA IS USEFUL FOR BOTH RECEIVING AND HIGH POWER TRANSMITTING APPLICATIONS AND SHOULD FIND PARTICULAR USEFULNESS IN THE HIGH FREQUENCY RANGE OF 2-30 MHZ. THE ANTENNA CONSISTS OF A SINGLE TURN TNED PRIMARY FED BY A SMALL, SINGLE TURN UNTUNED SECONDARY. BY PROPER ADJUSTMENT OF THE RATIO BETWEEN THE DIAMETERS OF THE PRIMARY AND SECONDARY LOOPS, AN ACCURATE MATCH TO A LOW IMPEDANCE CABLE (50
OHMS) MAY BE ACHIEVED OVER THE ENTIRE TUNING RANGE. MINIMUM EFFICIENCIES OF 30 PERCENT ARE ATTAINABLE WITH PRACTICAL DESIGNS HAVING A DIAMETER OF ONLY 5 FEET FOR 3-15 MEGAHERTZ COVERAGE.
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