This paper theoretically verified the efficiency improvement of the MF transmitting antennas attained changing the conventional monopole antenna to a folded type of antenna.
Numerical improvement in the input impedance and radiation efficiency charactiristics are obtained ; by about 15% in radiation efficiency.
The applicable frequency band of this new antenna is also shown in a graph, and its merits are as follows :
(1) Improvement in radiation efficiency without increase of the antenna-height.
(2) Radial earth system conventional required can be economized to some extent.
(3) Lower antenna height attained reduces the danger of lighting.
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