Buried Antenna Performance: Development of Small Resonant Buried Antennas
Final rept. May 1972-Aug 1973
NATIONAL BUREAU OF STANDARDS BOULDER CO ELECTROMAGNETIC TECHNOLOGY DIV
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Small resonant dipole antennas at 145 MHz were developed suitable to be buried for concealment. Theory of the pattern and the loss of buried dipoles is summarized. Experiments are described that confirm the theory. The circuit representation of a resonator is used in measuring and analyzing the Q, bandwidth, and impedance of the antennas. The field strength performance of buried candidate antennas was measured and agreed with expected losses due to burial and inefficiency. Theoretically a resonant horizontal magnetic dipole has the lowest burial loss for the fully buried condition. A resonant horizontal electric dipole may have equally low loss in practice because its efficiency is better for the size allowed. Low ten centimeter profile vertical electric dipoles, not fully buried, exhibit even smaller losses and would be useful. The performance of these buried antennas could be improved by allowing a larger encapsulation.
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