Abstract
A new dielectric rod antenna (DRA) is introduced to produce circular polarization (CP) over a wide frequency band without a complex feed network. Along with the simulated results, measured results of the antenna prototype are presented, showing a 3 dB axial ratio (AR) CP bandwidth of 17.7%. The radiation characteristics of the fabricated antenna are also demonstrated showing the measured gain of better than 6.2 dBi. Moreover, the measured impedance bandwidth (VSWR≤2) reaches 20.1%, from 8.75 GHz to 10.7 GHz, while the CP beamwidth (AR≤3 dB) at the central frequency is measured over 120°.
Highlights
Polarized waves are often used to offer better propagation characteristics through the atmosphere and reduced multipath effect as well as the flexibility of orientation between the transmitting and receiving antennas
In this paper a single-fed circular polarization (CP) dielectric rod antenna (DRA) is presented, where the phase transformer is made by introducing a dielectric sheet in the circular feed waveguide
The proposed antenna prototype has been fabricated and measured to verify its CP operation, whose parameters are optimized by using the simulation software HFSS 11
Summary
Polarized waves are often used to offer better propagation characteristics through the atmosphere and reduced multipath effect as well as the flexibility of orientation between the transmitting and receiving antennas. The single feed is of simplicity advantage of not requiring an external polarizer such as 90◦ hybrid coupler, but it usually leads to a limited AR bandwidth in the range of a few percentage. A single-fed elliptical dielectric resonator antenna is proposed with a circular polarization bandwidth of 3.5% [1]. The multipoint feed is of a wider CP bandwidth, but an external feeding circuit is required. In this paper a single-fed CP DRA is presented, where the phase transformer is made by introducing a dielectric sheet in the circular feed waveguide. This CP design does not require a complex feed network or special configuration of the radiating element. Details of the proposed antenna design are described and experimental results of its CP performance are presented and discussed
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