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Effect of internal reflections on the radiation properties and input admittance of integrated lens antennas

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3 Author(s)
van der Vorst, M.J.M. ; Fac. of Electr. Eng., Eindhoven Univ. of Technol., Netherlands ; de Maagt, P.J.L. ; Herben, M.H.A.J.

This paper begins with the modeling of the reflected waves within integrated lens antennas, which consist of a dielectric lens on which a planar antenna is mounted. It is demonstrated that if the relative dielectric constant of the lens is small (εr⩽4), the single- and double-reflected waves are sufficient to analyze the effect of the internal reflections. For small angles around boresight, these unwanted reflected fields mainly affect the cross-polar far-field pattern, while for large observation angles, both the co-polar and cross-polar patterns are significantly disturbed. It appears that by neglecting the internally reflected field contributions, the beam efficiency may be overestimated more than 10%. In this paper, two types of matching layers are analyzed in order to reduce these unwanted reflections. It is demonstrated that the radiation performances of the integrated lens antennas with optimum-thickness and quarter-wavelength matching layer are almost equal. Even for low dielectric-constant lenses, the beam efficiency can be increased by over 10%. Finally, it is demonstrated that the internal reflections may also have a strong effect on the antenna admittance, which can only be reduced partly by the use of a matching layer

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:47 ,  Issue: 9 )

Date of Publication:

Sep 1999

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