COMMON ANTENNA FOR MULTIFREQUENCY BAND

摘要

PURPOSE:To radiate a plurality of beams in different frequency band, by using a reflecting mirror synthesized with a plurality of rotating parabola planes having different focal lengths. CONSTITUTION:Electromagnetic waves radiated from a primary radiator 5 is radiated as plane waves from a reflecting mirror 3. When a distance (l) between the center 6 of the mirror 3 and the center 6' of the mirror 3' is <=1/8 than the feeding wavelength, the deterioration by the mirror 3' is less. A part of the electromagnetic waves from a primary radiator 5' is radiated by the reflecting mirror 3 and gives effect to the beam from the mirror 3', but the reflecting mirror 3 can be neglected by regulating the strength of electromagnetic waves at the outside of the mirror 3' to <=1/10 than that toward the center. Thus, a plurality of beams in different frequency bands can be radiated efficiently.