Chio Tan-Huat

3-D metal-direct-printed wideband and high-efficiency waveguide-fed antenna array

The Direct Metal Laser Sintering (DMLS) 3-D printing technique is used to fabricate a relatively large 8×8 wideband waveguide array with an integrated corporate-fed network. This DMLS rapid prototyping technique offers the flexibility to fabricate complicated waveguide-based structures with good reliability and high-precision. Experimental results show antenna efficiency is higher than 80% over a wide operation bandwidth and even exceeding 90% at most frequencies. This work demonstrates the 3-D DMLS technique is a promising manufacturing method for the fabrication of complex waveguide antenna arrays.

Dual-wideband, dual-polarized shared aperture antenna with high isolation and low cross-polarization

This paper describes the design of a dual-wideband dual linear polarization shared aperture patch antenna. The antenna consists of one antenna element for L-band and an 8×8 planar array for X-band, sharing the same radiation aperture. The array, together with the feeding network is analyzed with HFSS software. The Return Loss, Isolation, and Radiation Patterns of the array are presented. The impedance bandwidth of this antenna array, corresponding to 10dB Return Loss is 13.0% and 14.7% in L- and X-band respectively. The isolation between the orthogonal polarization ports is better than 25 dB and 35 dB in L- and X-band respectively. The cross-polarization is below -22 dB and -25 dB in L- and X-band respectively.

Dual circular polarized array with metal 3D-printing

A low profile wideband 16×16 waveguide array with dual circular polarizations is proposed. A 90 degrees hybrid is integrated with the array to obtain the dual circular polarizations. The whole metal structure is adopted to achieve high radiation efficiency. This antenna will be fabricated with Metal 3D Printing.