CASSEGRANINIAN ANTENNA HAVING LIMITED SPILLOVER ENERGY
First Claim
1. In a Cassegrainian antenna for microwave electromagnetic radiation, including, in this order, a main reflector, a source of excitation which transmits or receives a radiation lobe, a secondary reflector coaxial with the said main reflector and receiving on its reflecting face a part of the said radiation lobe, a spillover portion of the lobe being directed, in certain low positions, from the axis of the antenna in the direction of the ground, thus producing the parasitic spillover coupling through the ground, the improvement wherein the antenna comprises in addition an electrically conductive deflector fixed relative to said secondary reflector, said deflector being disposed after the said secondary reflector, on the side remote from the reflecting face of the said secondary reflector in the space situated between the ground and the said axis of the antenna, in such manner as to intercept the said spillover portion.
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Abstract
A deflector is fixed relative to coaxial main and secondary antenna reflectors, after said secondary reflector and between the ground and the axis of the antenna to intercept parasitic radiation spillover.
9 Citations
4 Claims
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1. In a Cassegrainian antenna for microwave electromagnetic radiation, including, in this order, a main reflector, a source of excitation which transmits or receives a radiation lobe, a secondary reflector coaxial with the said main reflector and receiving on its reflecting face a part of the said radiation lobe, a spillover portion of the lobe being directed, in certain low positions, from the axis of the antenna in the direction of the ground, thus producing the parasitic spillover coupling through the ground, the improvement wherein the antenna comprises in addition an electrically conductive deflector fixed relative to said secondary reflector, said deflector being disposed after the said secondary reflector, on the side remote from the reflecting face of the said secondary reflector in the space situated between the ground and the said axis of the antenna, in such manner as to intercept the said spillover portion.
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2. The antenna according to claim 1, wherein said deflector comprises a plane surface which forms an angle of about 45* with said axis of the antenna.
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3. The antenna according to claim 2, wherein the plane surface of the deflector has an approximately square form within which lies a trapezoidal recess.
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4. The antenna according to claim 2, wherein the overall dimensions of said plane surface are substantially equal to the diameter of said secondary reflector.
Specification
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- Resources
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Current AssigneeAndre Rabadeux, Yves Tocquec
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Original AssigneeAndre Rabadeux, Yves Tocquec
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InventorsTocquec, Yves, Rabadeux, Andre
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Primary Examiner(s)Miller, Jr., Stanley D.
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Application NumberUS05/174,600Time in Patent Office482 DaysField of Search343/781,782,833,837US Class Current343/782CPC Class CodesH01Q 19/026 for reducing the primary fe...
