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It is known that a loop antenna of one wavelength circumference radiates a linearly polarized wave in the direction normal to the antenna plane. It is also known that, when perturbation elements are added to the loop, the linearly polarized wave can be changed to a circularly polarized wave [1]. For mobile communications, the circularly polarized wave at low elevation angles is often required to have...
The antenna characteristics of helices for the normal and axial modes [1] have been theoretically revealed using numerical techniques. However, little theoretical analysis has been performed for revealing the antenna characteristics of the conical mode [2][3]. With this background, this paper presents the antenna characteristics of the conical mode helix. The antenna characteristics presented here...
A metaloop antenna that has a negative propagation phase constant for the current on its closed arm is proposed and investigated. A linearly polarized (LP) broadside radiation pattern is obtained at different frequencies below and above frequency fT, where the propagation phase constant is zero. In addition, it is revealed that the metaloop forms an LP dual-peak radiation pattern at different frequencies...
Recently, we have analyzed a spirally-wound antenna [1][2] proposed by Fenwick using the method of moments. The analysis shows that the. input impedance is very low (less than 4 ohms). It is also shown that the frequency bandwidth is very narrow (less than 0.2% for a criterion of VSWR = 2 to an input resistance at resonance). In this paper, we realize higher input resistance over a wider frequency...
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