Abstract
A 3D printed, low-profile, electrically small antenna with a quasi-isotropic radiation pattern is presented herein. It is composed of an electric meandered dipole antenna, and the extended arcs from the meander line mimicking the current flow of the loop antenna. A quasi-isotropic radiation pattern is achieved from the total current flow over the proposed structure. Modern stereolithographic 3D printing and nano-polycrystalline copper coating technologies are used to build a prototype. The measured antenna exhibits a good uniformity in terms of the radiation pattern with a maximum gain deviation of 4.5 dB at 959 MHz and a radiation efficiency of 81 %, close to the computed expectations. The electrical size of the antenna ka is 0.48, and its height is $\lambda _{0}$ /82.32.
Highlights
Research on the realization of an isotropic antenna is demanding due to its characteristic of uniform wireless signal reception
A common strategy to achieve a quasi-isotropic radiation pattern is to bring electric and magnetic dipoles together perpendicularly, such that the null-field direction of one dipole is along the maximum-field direction
A monopole antenna was properly wrapped on a 3D-printed package in [3], showing the quasi-isotropic radiation pattern at dual frequency bands, and inductively coupled meander line structures were folded around the sides of a cube in [4]
Summary
Research on the realization of an isotropic antenna is demanding due to its characteristic of uniform wireless signal reception. A common strategy to achieve a quasi-isotropic radiation pattern is to bring electric and magnetic dipoles together perpendicularly, such that the null-field direction of one dipole is along the maximum-field direction. A planar type quasi-isotropic antenna is feasible using the same technique of radiation pattern synthesis of electric and magnetic dipoles [5]–[7] or two crossed electric dipoles [8]. We propose a novel low-profile design of a self-resonant ESA with a high radiation efficiency and a good quasi-isotropic radiation pattern. It is designed and tested at the 900 MHz ISM frequency band. We use HFSS from Ansys for the full-wave electromagnetic simulations in this work
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