• Shrestha, Sujan
• Asadnia, Mohsen

Abstract

The three dimensional printing method is currently on stage of rapiddevelopment to realize complex nature of structure in simpler andfeasible ways. In this paper, we proposed a 3D printed wideband antennastructure with high performance to improve the characteristicsproperties of feed source by eliminating the use of expensivesuperstates. A 60 mm×60mm×22.5mm wideband structure was first fabricated from VERO CMYK materialthrough Multijet 3D printing method where the bottom layer are copperpainted so as to realize the higher permittivity layer. The proposedstructure is maintained at 16 mm (0.64λ) above the ground plate of 60 mm×60mm×1 mm, which is feed by WR-75 waveguide. The proposed antenna isdesigned to have a wide operating bandwidth from 10 to 15 GHz, whichcover Ku-band frequency range. Directivity enhancement is obtained over alarge bandwidth by using high permittivity material for Layer 1 andlower permittivity material for Layer 2 and Layer 3. The resultingantenna prototype demonstrates a directivity bandwidth product (DBP) of3012.79 and DBP per unit area (DBP/A) of 523.06, where directivity andgain are found to be higher than 15 dBi over the entire operatingfrequency band. The total area of the new antenna prototype is2.4λ×2.4λ×0.9λ(4.16λg×4.16λg×1.56λg), and overall electrical height is1.54λat the design frequency of 12 GHz. The proposed prototype weight 36 gand overall system have weight of 118 g, which is light in weight. Themeasured VSWR is less than 2, which signifies wideband characteristicsof overall system.

Topics

• impedance spectroscopy
• laser emission spectroscopy