Antennas
First Claim
1. A Cassegrain antenna system comprising a primary reflector and a secondary reflector, the secondary reflector comprising:
- a mirrored surface;
a frequency selective surface associated with the mirrored surface;
wherein the frequency selective surface is configured to reflect received radiation of a first radio frequency band and allow received radiation of a second frequency band to pass, the second frequency band including the electro-optic range of frequencies;
and wherein the mirrored surface is configured to reflect the received radiation of the second frequency band;
thereby the focal power for received radiation of the first radio frequency band is independent of the focal power for received radiation of the second frequency band.
1 Assignment
0 Petitions
Accused Products
Abstract
A reflector 38 includes a mirrored surface 48 and a frequency selective surface 46. The frequency selective surface 46 is arranged to reflect radiation of a first frequency band 52 and allow radiation of a second frequency band 50 to pass. The mirrored surface 48 is arranged to reflect radiation of the second frequency band 50. In this manner, the focal power for radiation of the first frequency band 52 is independent to the focal power for radiation of the second frequency band 50. Accordingly, the design of optical components associated with the second frequency band 50 can be undertaken independently of those associated with the first frequency band 52 so as to achieve the optimised focusing for each frequency band.
-
Citations
9 Claims
-
1. A Cassegrain antenna system comprising a primary reflector and a secondary reflector, the secondary reflector comprising:
-
a mirrored surface; a frequency selective surface associated with the mirrored surface; wherein the frequency selective surface is configured to reflect received radiation of a first radio frequency band and allow received radiation of a second frequency band to pass, the second frequency band including the electro-optic range of frequencies; and wherein the mirrored surface is configured to reflect the received radiation of the second frequency band; thereby the focal power for received radiation of the first radio frequency band is independent of the focal power for received radiation of the second frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A missile seeker comprising a Cassegrain antenna system comprising a primary reflector and a secondary reflector, the secondary reflector comprising:
-
a mirrored surface; a frequency selective surface associated with the mirrored surface; wherein the frequency selective surface is configured to reflect received radiation of a first radio frequency band and allow received radiation of a second frequency band to pass, the second frequency band including the electro-optic range of frequencies; and wherein the mirrored surface is configured to reflect the received radiation of the second frequency band; thereby the focal power for received radiation of the first radio frequency band is independent of the focal power for received radiation of the second frequency band.
-
Specification