Quadrifilar Helical Antennas with Parasitic Loops

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概要

• 論文の詳細を見る

• Backfire quadrifilar helical antennas combined with parasitic loops are investigated in detail, focusing on clarifying the function of parasitic loops. First, the basic property is examined for the case of one parasitic loop, and it is found that the loop behaves as a director when the circumferential length of the loop is nearly 0.9λ, and a reflector when the circumferential length of the loop is nearly 1.2λ provided the distance between the parasitic loop and the top plane of helical antennas is approximately 0.1λ, where λ is the wavelength. Next, the function of the parasitic loop is investigated by comparing the current distributions on the helices and the loop with those on a monofilar helix with a ground plane. It is found that the function of the parastic loop is quite different from that of the ground plane. Then, the case of two parasitic loops is examined, and it is shown that the use of two parasitic loops is very effective and simple measures to control the radiation pattern and gain of the backfire quadrifilar helical antennas. Finally, for this type of antennas with two parasitic loops, an example of structural parameters suited to the use in satellite communications is presented.

• 社団法人電子情報通信学会の論文
• 1998-11-25

著者

• Tokumaru Shinobu

  The Faculty Of Science And Technology Keio University

• KAZAMA Yasuhiro

  the Laboratory, Japan Radio Co., Ltd.

• Kazama Yasuhiro

  The Laboratory Japan Radio Co. Ltd.

関連論文

• Source and Radiation Field Solution for Dielectric Scatterers : E Wave (Special Issue on Electromagnetic Theory : Foundations and Applications)
• Presumption of Permittivity for Dielectric Inverse Scattering Problem : Source and Radiation Field Solution(Special Issue on Computational Electromagnetics)
• Application of a Parasitic Loop on Loosely Wound Short-Arm Spiral Antennas
• Quadrifilar Helical Antennas with Parasitic Loops

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