ISSTT Proceedings

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Characterization of an integrated lens antenna at terahertz frequencies

Authors:
P. Yagoubov, W.-J. Vreeling, P. de Korte
Abstract:
Results of beam pattern and polarization measurements on quasioptical integrated lens antennae at terahertz frequencies are presented. The integrated antenna consists of a planar spiral antenna mounted on the flat surface of an extended hemispherical lens. The planar antenna used is an equiangular logarithmic spiral, which comprises 1.5 turns with a spiral expansion rate of 3.2 per turn. The RF bandwidth of the antenna is designed to 0.3-2.5 THz. We have investigated the optical performance of such an integrated antenna and observed that the polarization is changing from almost circular at frequencies below 1.4 THz to elliptical with an axial ratio equal to 3 at 2.5 THz. The beam patterns have been measured up to 2.5 THz for two orthogonal polarization directions aligned with the elliptical polarization axes. The main lobes are primarily diffraction limited by the aperture of the lens. The first order sidelobe level equals -16 dB at 0.6 THz and increases to –8-12 dB at 1.4 THz and -7-10 dB at 2.5 THz.
Categories:
Poster Session
Year:
2001
Session:
5
Full-text:
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Page Number(s):
193-204