Abstract
A novel circularly polarized knot antenna with the conical beam radiation pattern is presented. It consists of a (3, 8) torus knot as a radiator which is excited by a monopole probe. Measured results show that the antenna has an impedance bandwidth of 39.6% covering the frequency range 3.54 GHz to 5.29 GHz and usable axial ratio bandwidth of 26.8%. (3, 8) torus knot antenna is mechanically simple to fabricate using 3D printing technology. The proposed prototype is suitable for mounting on vehicles to facilitate communication with geostationary satellites.
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