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A new type of broadband miniature antenna consists of helical dipole folded by central conductor is presented in this paper. Besides a brief analysis, the experimental results show the good performances of wider bandwidth (25%–40%), higher input impedance(about 200 Ohms), and flexible for designing, it is suitable to be used as both mobile vertical antenna and excitor of Yagi antenna.
This paper presents a high-gain 6–40 GHz circularly polarized antenna system designed for a 6U CubeSAT mission for monitoring RF emission from earth. The antenna system consists of three quasi-tapered helical antenna elements, operating at 6–11 GHz, 11–22 GHz and 21–40 GHz, respectively. Each antenna element is designed to produce an end-fire beam with its helical diameter varying along its axis to...
Helical antennas are versatile, but they have almost purely resistive input impedance, so lumped element matching networks inevitably incur power loss. We investigate an alternative matching technique that claims up to 1∶1 VSWR with post-fabrication tuning, by using an extension above the ground plane. However, our results show that the lowest return losses may actually occur outside the desired band...
This study investigates a new design for the hemispherical heliacal antenna that provides significant improvement in bandwidth, while maintaining essentially the same directivity and half-power beamwidth of the basic hemispherical helical design. The proposed new design utilizes a wideband impedance matching technique and replaces the wire radiating element with a tapered metallic strip. This design...
A compact circularly polarized (CP) vertical patch antenna is presented that employs a microstrip to slot-line transition for a wideband operation. The antenna is composed of two vertical patches, which are shaped as helix to obtain a broadband CP performance. The loop structure and the vertical overlap configuration lead to significant size reduction as much as 48% when compared to that of the printed...
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