Abstract
In this paper, a slots-coupled omnidirectional circularly polarized (CP) cylindrical dielectric resonator antenna (DRA) is proposed. The TM01 <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">δ</sub> and TE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">011+δ</sub> modes of the cylindrical DRA are simultaneously excited by four printed slots placed at 45 degrees to the radial direction. Omnidirectional CP fields are obtained when the fields of the two modes have the same amplitude and 90 degrees phase difference. Compared with the traditional probe-fed method, the structure of the proposed slots-coupled DRA is very simple, without introducing any groove, patch, choke or shorting pins. For the demonstration, a slots-coupled omnidirectional CP cylindrical glass DRA is designed for 5.8-GHz WLAN application. It is found that the proposed DRA can provide an AR bandwidth of 8 % (5.62-6.09 GHz) and a gain of 5.6 dBic, with a height of 0.127λ0. This performance is competitive with other reported omnidirectional CP DRAs.
Highlights
In the last three decades, dielectric resonator antenna (DRA) [1]–[4] has been widely investigated owning to its small volume, easy excitation and controllable bandwidth
It can be seen from the figure that the design only consists of a solid glass cylindrical DRA and a substrate, which is very simple
This paper has investigated a slots-coupled omnidirectional circularly polarized (CP) cylindrical glass DRA
Summary
In the last three decades, dielectric resonator antenna (DRA) [1]–[4] has been widely investigated owning to its small volume, easy excitation and controllable bandwidth.
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