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Three-Dimensional Microfabricated Broadband Patch Antenna for WiGig Applications

NCJ Number
Date Published
H. Mopidevi, H.V. Hunerli, E. Cagatay, N. Biyikli, M. Imbert, J. Romeu, L. Jofre, B.A. Cetiner
This article describes the design, microfabrication, and characterization of a broadband patch antenna capable of covering the entire IEEE 802.11ad (WiGig) frequency band (57-66 GHz).
A conductor-backed (CB) coplanar waveguide (CPW)-fed loop slot couples the energy to the patch antenna, resulting in a broad bandwidth. The feed circuitry, along with the loop, is formed on a quartz substrate (år = 3.9, tan ä = 0.0002 at 60 GHz), on top of which an SU-8-based three-dimensional (3-D) structure with air cavities is microfabricated. The patch metallization is deposited on top of this 3-D structure. While the main role of the structure made out of SU-8 material is to provide a mechanical support for the patch metallization, the antenna takes advantage of the air cavities underneath, thus resulting in an antenna substrate with a very low loss. This, in turn, improves the overall antenna performances. The simulated and measured impedance characteristics agree well, showing ~15 percent bandwidth. Also, the radiation pattern results demonstrate the integrity of radiation pattern with reasonably constant gain values (average ~6.4 dB) in the broadside direction over the entire WiGig band. (Publisher abstract modified)
Date Created: July 13, 2016