Monostatic Reflectivity and Transmittance of Radar Absorbing Materials at 650 GHz

Author

Tamminen, Aleksi ; Lönnqvist, Anne ; Mallat, Juha ; Räisänen, Antti V.

Author_Institution

Helsinki Univ. of Technol., Espoo

Volume

56

Issue

3

fYear

2008

fDate

3/1/2008 12:00:00 AM

Firstpage

632

Lastpage

637

Abstract

Transmittance and monostatic reflectivity of different radar absorbing materials at 650 GHz are presented. The reflectivity was measured in plane-wave conditions in a radar cross-section (RCS) range with vertical polarization. The lowest reflectivity level (-70 dB) was achieved with commercial absorbers TK THz RAM and Firam-500 with oblique incidence angles. Floor carpets were also studied, and the reflectivity level of those was found to be sufficiently low (from -50 to -60 dB) for use in antenna test ranges. Results agree with earlier studies and indicate the applicability of the RCS method in reflectivity measurements also at 650 GHz.

Keywords

antenna testing; electromagnetic wave polarisation; electromagnetic wave reflection; radar cross-sections; reflectivity; RCS range; antenna test ranges; floor carpets; frequency 650 GHz; monostatic reflectivity; oblique incidence angles; plane-wave conditions; radar absorbing materials; radar cross-section range; reflectivity measurements; transmittance; vertical polarization; Antenna test range; monostatic reflectivity; radar absorbing materials (RAMs); radar cross section (RCS);

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2008.916881

Filename

4449068