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Reflections inside an elliptical dielectric lens antenna

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3 Author(s)
Neto, A. ; Coll. of Eng., Siena Univ., Italy ; Maci, S. ; de Maagt, P.J.I.

The reflections inside the elliptical lens of a typical millimetre wave antenna are investigated. In particular, it is seen that these reflections may significantly affect the input impedance of a radiating element which is located at the lens focus, owing to the presence there of a point caustic of doubly reflected rays. The presence of a caustic prevents the field prediction inside the lens by a direct application of geometrical optics. Consequently, the field inside the lens is calculated by means of the physical optics currents associated with singly and doubly reflected rays

Published in:

Microwaves, Antennas and Propagation, IEE Proceedings  (Volume:145 ,  Issue: 3 )

Date of Publication:

Jun 1998

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