Gleeson, E. and Murphy, J.Anthony and Maffei, B. and Lanigan, W. and Brossard, J. and Cahill, G. and Cartwright, E. and Church, S.E. and Hinderks, J. and Kirby, E. and O'Sullivan, Créidhe
(2005)
Corrugated waveguide band edge filters for CMB
experiments in the far infrared.
Infrared Physics & Technology, 46.
pp. 493-505.
ISSN 1350-4495
Abstract
Millimetre wave corrugated waveguide-horn structures are used as both single-moded and multi-moded bolometer
feeds in a number of cosmic microwave background (CMB) experiments (e.g. PLANCK, Archeops, QUaD). Such
horns tend to be employed over a relatively wide bandwidth and for single-moded horns the waveguide acts as the high
pass filter. In this paper we report on our investigation on how the waveguide details determine the exact location of the
low frequencyband edge of such corrugated horns. A sharp step-like band edge, below which there is negligible propagation,
is ideallyrequired. Furthermore anyleakage below the expected cut-off, possible in corrugated guides, could
lead to non-idealised cross-polar effects. Typically deeper corrugations are required in the waveguide filter than at the
horn aperture for wide bandwidth operation, thus necessitating a transition section over which the corrugation depth
smoothlyvaries. An electromagnetic mode matching technique and a surface impedance hybrid mode model are used to
compute the horn transmission characteristics. We have also undertaken laboratorymeasurements of the band edge of
prototype corrugated horns in order to test the models.
Item Type: |
Article
|
Additional Information: |
The definitive version of this article is available at DOI: 10.1016/j.infrared.2004.10.001 . The authors wish to acknowledge the financial assistance of Enterprise Ireland, the Irish Research Council for Science and Technology: IRCSET (Embark award) and the National University of Ireland Maynooth (Daniel O’Connell Fellowship). |
Keywords: |
Band edge; Filters; CMB; Corrugated horns; |
Academic Unit: |
Faculty of Science and Engineering > Experimental Physics |
Item ID: |
5935 |
Identification Number: |
https://doi.org/10.1016/j.infrared.2004.10.001 |
Depositing User: |
Dr. Créidhe O'Sullivan
|
Date Deposited: |
04 Mar 2015 17:02 |
Journal or Publication Title: |
Infrared Physics & Technology |
Publisher: |
Elsevier |
Refereed: |
Yes |
Funders: |
Irish Research Council for Science Engineering and Technology (IRCSET) |
URI: |
|
Use Licence: |
This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available
here |
Repository Staff Only(login required)
|
Item control page |
Downloads per month over past year
Origin of downloads