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A dual-loop antenna, each loop having a single wire, is analyzed using the method of moments. Special attention is paid to the bandwidth for a 3-dB axial-ratio criterion. A comparison between the reference and modified antennas reveals that the bandwidth can be enlarged by a factor of two.
Two composite antennas are investigated as a triple-frequency element. First, a double-loop antenna with a C-figured loop is analyzed using the moment method. Secondly, on the basis of the radiation characteristics we analyze another double-loop antenna with two L-figured wires. It is found that the antenna has almost the same triple-frequency characteristics as those of the double-loop antenna with...
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