High performance multi-band frequency selective reflector with equal beam coverage

Claim 2

A high performance multi-band antenna reflector for use with first and second different frequency bands to produce a comparable beam cell size for each frequency band, comprising: a concave reflector having central and outer concentric zones, the central concentric zone reflecting signals in the first and second frequency bands and the outer concentric zone configured as a frequency selective surface that reflects signals in the first frequency band and passes signals in the second frequency band; the central concentric zone having a reflective layer on an inner surface; and at least one resistance card overlaying a junction between the reflective layer of the central concentric zone and the frequency selective surface of the outer concentric zone on at least a first side of the junction.

Claim 3

The multi-band antenna reflector of claim 1 , and further including at least a second resistance card overlaying the junction between the reflective layer of the central concentric zone and the frequency selective surface of the outer concentric zone on a side opposite the first side of the junction.

Claim 4

The multi-band antenna reflector of claim 2 , wherein the outer concentric zone comprises a finite conducting pattern on top and bottom sides of a dielectric core, the dielectric core with the pattern on its top and bottom sides comprising the frequency selective surface, one of the resistance cards overlaying a portion of the pattern on the top side of the dielectric core and a portion of a top side of the reflective layer of the central concentric zone, the other one of the resistance cards overlaying a portion of the pattern on the bottom side of the dielectric core and a portion of a bottom side of the reflective layer of the central concentric zone, the reflector having low sidelobe and cross polarization levels and a carrier-to-interference ratio of better than seventeen decibels.

Claim 5

The multi-band antenna reflector of claim 3 , wherein the reflective layer of the central concentric zone comprises a metallized surface and the pattern comprises a metallic pattern.

Claim 6

The multi-band antenna reflector of claim 3 , wherein the pattern comprises a pattern of resonant lossy square loops.

Claim 7

The multi-band antenna reflector of claim 3 , wherein the pattern comprises one of a pattern of resonant lossy square loops, a pattern of dipoles, a pattern of tripoles, and a pattern of crosses.

Claim 8

The multi-band antenna reflector of claim 3 , wherein the concave reflector is a parabolic reflector, the first frequency band is the Ku frequency band and the second frequency band is the Ka frequency band.

Claim 9

The multi-band antenna reflector of claim 7 , wherein the concave reflector has a diameter of approximately 67 inches and the central concentric zone has a diameter of approximately 38.3 inches.

Claim 10

The multi-band antenna reflector of claim 1 , and further including dual frequency feeds for transmitting the first and second frequencies toward the concentric zones of the concave reflector.

Claim 11

A high performance multi-band antenna reflector for use with first and second different frequency bands to produce a comparable beam cell size for each frequency band, comprising: a concave reflector having central and outer concentric zones; the central concentric zone having a metallized surface that reflects signals in the first and second frequency bands; the outer concentric zone including a frequency selective surface formed of a dielectric core having a metallic pattern on top and bottom sides, the metallic pattern dimensioned to reflect signals in the first frequency band and pass signals in the second frequency band; at least a first resistance card overlaying a top side of a junction between the metallized surface of the central concentric zone and the frequency selective surface of the outer concentric zone and at least a second resistance card overlaying a bottom side of the junction between the metallized surface of the central concentric zone and the frequency selective surface of the outer concentric zone; the reflector having low sidelobe and cross polarization levels and a carrier-to-interference ratio of better than seventeen decibels.

Claim 12

A high performance multi-band antenna reflector for use with first and second different frequency bands to produce a comparable beam cell size for each frequency band, comprising: a concave reflector having central and outer concentric zones; the central concentric zone having a metallized surface that reflects signals in the first and second frequency bands; the outer concentric zone including a frequency selective surface formed of a dielectric core having a metallic pattern on top and bottom sides, the metallic pattern dimensioned to reflect signals in the first frequency band and pass signals in the second frequency band; at least a first resistance card overlaying a top side of a junction between the metallized surface of the central concentric zone and the frequency selective surface of the outer concentric zone and at least a second resistance card overlaying a bottom side of the junction between the metallized surface of the central concentric zone and the frequency selective surface of the outer concentric zone; the reflector having low sidelobe and cross polarization levels and a carrier-to-interference ratio of better than seventeen decibels.

Claim 13

The multi-band antenna reflector of claim 10 , wherein the metallic pattern comprises a pattern of resonant lossy square loops.

Claim 14

The multi-band antenna reflector of claim 10 , wherein the metallic pattern comprises one of a pattern of resonant lossy square loops, a pattern of dipoles, a pattern of tri-poles, and a pattern of crosses.

Claim 15

The multi-band antenna reflector of claim 10 , wherein the concave reflector is a parabolic reflector, the first frequency band is the Ku frequency band and the second frequency band is the Ka frequency band.

Claim 16

The multi-band antenna reflector of claim 13 , wherein the concave reflector has a diameter of approximately 67 inches and the central concentric zone has a diameter of approximately 38.3 inches.

Claim 17

The multi-band antenna reflector of claim 10 , and further including dual frequency feeds that transmit signals in the first and second frequency bands toward the concentric zones of the concave reflector.