WR-3 Waveguide Bandpass Filters Fabricated Using High Precision CNC Machining and SU-8 Photoresist Technology

Liu, Bo, Yang, Hao, Dhayalan, Yuvaraj, Shang, M, Lancaster, Michael, Wang, H and Huggard, P.G (2017) WR-3 Waveguide Bandpass Filters Fabricated Using High Precision CNC Machining and SU-8 Photoresist Technology. IEEE Transactions on Terahertz Science and Technology, 8 (1). pp. 100-107. ISSN 2156-3446

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Abstract

This paper presents two WR-3 band (220-325 GHz) filters, one fabricated in metal using high precision computer numerically controlled milling and the other made with metallized SU-8 photoresist technology. Both are based on three coupled resonators, and are designed for a 287.3-295.9-GHz passband, and a 30-dB rejection between 317.7 and 325.9 GHz. The first filter is an extracted pole filter coupled by irises, and is precision milled using the split-block approach. The second filter is composed of three silver-coated SU-8 layers, each 432 μm thick. The filter structures are specially chosen to take advantage of the fabrication processes. When fabrication tolerances are accounted for, very good agreement between measurements and simulations are obtained, with median passband insertion losses of 0.41 and 0.45 dB for the metal and SU-8 devices, respectively. These two filters are potential replacements of frequency selective surface filters used in heterodyne radiometers for unwanted sideband rejection.

Item Type: Article
Divisions: Applied Science, Computing and Engineering
Depositing User: Hayley Dennis
Date Deposited: 11 Jun 2018 13:24
Last Modified: 11 Jun 2018 13:24
URI: http://glyndwr.repository.guildhe.ac.uk/id/eprint/17309

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