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We have proposed and discussed a dual-spiral slot as a circularly polarized radiation element with a simple feeding system [1]. The dual-spiral slot located in the x-y plane, as shown in Fig. 1(a), has different radiation patterns in the x-z and y-z planes, due to its dual-element configuration. When the same radiation pattern is required in the x-z and y-z planes, the dual configuration is changed...
Using the method of moments, we analyze two types of microstrip-line antennas. They are connected and penetrated loop-line antennas, each consisting of loops and straight lines. It is found that circularly polarized radiation is obtained when the straight lines are appropriately shifted with respect to the loop centers.
A loop antenna having a gap has been investigated in the presence of a ground plane. The antenna configuration is optimized for the CP radiation, using the method of moments. It is found that, as the loop height above the ground plane is reduced, the optimized gap width approaches zero. Further antenna height reduction is found to be possible for an antenna whose wire radius is increased. On the basis...
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