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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 dual-band metahelical antenna that has a negative phase constant for the current on the helical arm is realized. A left-handed circularly polarized (CP) wave is obtained within a specific frequency band and a right-handed CP wave is obtained within a different frequency band. The antenna characteristics, including the radiation pattern, gain, and input performance (VSWR) are presented and discussed.
A novel helical antenna, designated as the metahelical antenna, is proposed, where the helical arm has electromagnetic right-handed (RH) and left-handed (LH) properties. The antenna design process is described. It is found that the metahelical antenna radiates a circularly polarized (CP) wave within two frequency bands. The rotational sense of the CP wave within one of the frequency bands is opposite...
A wire composite helical-spiral (CHES) antenna fed from the central point of its bottom is investigated, where the number of helical turns is selected to be extremely small (one turn). The CHES is designed such that it radiates a circularly-polarized tilted beam under the condition that the diameter of the CHES is smaller than that of a corresponding tilted-beam spiral antenna. It is found that the...
This paper presents a spiral antenna backed by a mushroom-shaped EBG reflector. The antenna characteristics are investigated on the basis of the electric and magnetic fields obtained by using the finite-difference time-domain method. The investigation reveals that removing some patches from the EBG reflector improves the axial ratio.
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