Multi-reflector antenna
First Claim
1. A multi-reflector antenna having a main reflector surface, a subreflector surface and a primary radiator are arranged for electromagnetically coupling together, characterized in that the main reflector surface is represented by a coordinate z=z(ρ
- , ψ
) in a vector system using a cylindrical coordinate system (z, ρ
, ψ
) in which a radiation direction of a main beam of the main reflector surface is in correspondence with a z-axis of the cylindrical coordinate system (z, ρ
, ψ
) and the subreflector surface is represented by a coordinate r=r(θ
, φ
) in a vector system using a spherical coordinate system (r, θ
, φ
) in which a radiation direction of a main beam of the primary radiator is in correspondence with a direction of θ
=0, the said coordinates z(ρ
, ψ
) and r(θ
, φ
) are so determined as to satisfy equations of Snell'"'"'s law of reflection for a reflection on the main reflector surface and the subreflector surface, equations of a condition of a constant path length and a following relation;
space="preserve" listing-type="equation">ψ
=-φ
+ψ
.sub.0
space="preserve" listing-type="equation">ρ
=ρ
.sub.0 tan θ
/2where ψ
0 and ρ
0 are constants.
4 Assignments
0 Petitions
Accused Products
Abstract
A multi-reflector antenna is disclosed which is arranged so that a main reflector surface, a subreflector surface and a primary radiator are electro-magnetically coupled together. When the main reflector is represented by a coordinate z=z(ρ, ψ) using cylindrical coordinate system (z, ρ, ψ) in which the direction of radiation of a main beam of the main reflector surface is in correspondence with the z-axis and the subreflector surface is represented by a coordinate r=r(θ, φ) in a vector system using a spherical coordinate system (r, θ, φ) in which the Snell'"'"'s reference direction of the primary radiator is set to θ=0, the said z(ρ, ψ) and r(θ, φ) are so determined as to satisfy the law of reflection, a condition of constant path length and the following relation:
ψ=-φ+ψ.sub.0
ρ=ρ.sub.0 tanθ/2
where ψ0 and ρ0 are constants. The primary radiator is comprised of a plurality of horns.
15 Citations
2 Claims
-
1. A multi-reflector antenna having a main reflector surface, a subreflector surface and a primary radiator are arranged for electromagnetically coupling together, characterized in that the main reflector surface is represented by a coordinate z=z(ρ
- , ψ
) in a vector system using a cylindrical coordinate system (z, ρ
, ψ
) in which a radiation direction of a main beam of the main reflector surface is in correspondence with a z-axis of the cylindrical coordinate system (z, ρ
, ψ
) and the subreflector surface is represented by a coordinate r=r(θ
, φ
) in a vector system using a spherical coordinate system (r, θ
, φ
) in which a radiation direction of a main beam of the primary radiator is in correspondence with a direction of θ
=0, the said coordinates z(ρ
, ψ
) and r(θ
, φ
) are so determined as to satisfy equations of Snell'"'"'s law of reflection for a reflection on the main reflector surface and the subreflector surface, equations of a condition of a constant path length and a following relation;
space="preserve" listing-type="equation">ψ
=-φ
+ψ
.sub.0
space="preserve" listing-type="equation">ρ
=ρ
.sub.0 tan θ
/2where ψ
0 and ρ
0 are constants. - View Dependent Claims (2)
- , ψ
Specification
-
- Resources
-
Current AssigneeKDDI Corporation
-
Original AssigneeKokusai Densin Denwa Kabushiki Kaisha
-
InventorsWatanabe, Fumio, Nomoto, Shinichi, Mizuguchi, Yoshihiko
-
Primary Examiner(s)Sikes, William L.
-
Assistant Examiner(s)Wimer, Michael C.
-
Application NumberUS06/833,338Time in Patent Office1,106 DaysField of Search343/781 P, 343/781 CA, 343/779, 343/837US Class Current343/779CPC Class CodesH01Q 19/17 the primary radiating sourc...H01Q 19/192 with dual offset reflectors
