Focalization of new 40 m radiotelescope of Centro Astronomico de Yebes

The paper presents the solution for the focalization of the new 40 m radiotelescope of the Centro Astronomico de Yebes (CAY) in Guadalajara, Spain. Quasi-optics theory is used for the propagation analysis of the beams through the different optical elements. The goal of the paper is to design the optical system that can focalize several bands reducing to the minimum number of possible optical elements, and sharing the maximum number of them. Hyperbolic lens and ellipsoidal mirror parameters, focal distances, and the feeder dimensions necessary for the focalization in each band are calculated.