Abstract
This paper postulates a novel omnidirectional low-profile ultra-wideband (UWB) antenna, which is structured by discrete embedded dielectric resonator antenna with features of both low-profile dielectric resonator (DR) and thin planar monopole antenna, where the laminated equilateral triangular DR and the rectangular metal patch monopole are stacked up. This new design can lower the profile of the antenna. Furthermore, the symmetric DR and the monopole structure are able to make the surface currents in some operating modes opposite in phase, together with the characteristics of the coplanar waveguide (CPW) feed structure and the DR, the cross-polarization is reduced effectively. The mode analysis has been done to show how the antenna achieves the UWB. The CPW which can integrate with integrated circuits easily is used to provide the excitation source. The antenna provides consistent omnidirectivity, consistent gain, low cross-polarization, and high-radiation efficiency within the entire operation band. A prototype (dimensions are 17.6 mm $\times33.6$ mm and 1.524 mm thickness) is fabricated and measured. The measurements are well correlated with the simulations.
Highlights
It is well-known that the ultra-wide-band (UWB) system has many attractive advantages and antenna plays a very important role in the system
There are some major challenges for the design of UWB antennas including: achieve sufficient impedance matching bandwidth, the interference problem is caused by the nearby wireless communication band, compact antenna size, high radiation efficiency, and how to get a consistent uniform radiation pattern to avoid undesirable distortions of the radiated and received pulse [6]
The measurement results show that the proposed antenna has low cross-polarization in E-fields and constant omnidirectivity in H-fields in the entire working frequency band
Summary
It is well-known that the ultra-wide-band (UWB) system has many attractive advantages and antenna plays a very important role in the system. The UWB antenna has an extremely wide operation bandwidth within the microwave range, and a very low emission limit. There are some major challenges for the design of UWB antennas including: achieve sufficient impedance matching bandwidth, the interference problem is caused by the nearby wireless communication band, compact antenna size, high radiation efficiency, and how to get a consistent uniform radiation pattern to avoid undesirable distortions of the radiated and received pulse [6]. Most of the recent works aim at improving the performance of the UWB antenna, especially to avoid the interference problem [7]–[11].
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