We report the design, fabrication, and measurements of a circularly polarized 3D‐printed helical antenna operating at 5 GHz. Several commercially‐available dielectric printers and materials (eg, PLA, ABS, PC) were evaluated for the fabrication process. Metallization was performed with nickel electroless plating followed by copper electroplating. Fabrication and metallization process completed within 24 hours. Maximum gain of the antenna is measured as 13.9 dBic at broadside (RHCP). Measured efficiency of the antenna is 89.1% which shows the effectiveness of our metallization process. The results demonstrate the feasibility of rapid fabrication of lightweight and high efficient antennas using 3D printer technology.
Abstract-In this study, scattering from impedance bodies positioned at the edge of a perfectly electrically conducting wedge is investigated. In the treatment of the problem, eigenfunction expansion in terms of spherical vector wave functions is employed. A complete dyadic Green's function for the spherical impedance boss at the edge is developed. It is observed that the scattering is highly enhanced by the edge guided waves. Additionally, using T-matrix method, the solution is extended to the general case of irregularly shaped scatterers. The T-matrix solution is verified by applying it to the case of a spherical scatterer and results are compared with the dyadic Green's function solution.Index Terms-Dyadic Green's function, electromagnetic scattering, spherical vector wave functions, T-matrix, wedge scattering.
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