Parabolic and log periodic antennas combined for compact high-gain broadband antenna system
First Claim
1. A compact antenna system for enclosure within a radome of predetermined size comprising;
- a non-conductive parabolic dish;
first linear radiating means rigidly positioned in front of said dish for generating electric fields in a relatively high frequency band that are linearly polarized in one direction;
second linear radiating means extending through said dish and having radiating elements on either side thereof for generating electric fields in a relatively low frequency band that are linearly polarized perpendicular to said one direction; and
polarization selective means on said dish for reflecting said electric fields that are linearly polarized in said one direction, and for passing said electric fields that are linearly polarized perpendicular to said one direction with substantially no reflection.
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Abstract
The disclosed antenna system includes a non-conductive parabolic dish, a first antenna array rigidly positioned in front of the dish, and a second antenna array extending through the dish and having radiating elements on either side thereof. In one embodiment, a plurality of conductive strips are disposed on the dish in a polarization selective pattern; the first antenna array generates linearly polarized electric fields that are reflected by the strips; and the second antenna array generates linearly polarized electric fields that pass through the strips. In another embodiment of the invention a plurality of conductive areas are disposed on the dish in a checkerboard frequency selective pattern; the first antenna array generates electric fields in a frequency band that are reflected by the pattern; and the second antenna array generates electric fields in a frequency band that are passed by the pattern.
24 Citations
10 Claims
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1. A compact antenna system for enclosure within a radome of predetermined size comprising;
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a non-conductive parabolic dish; first linear radiating means rigidly positioned in front of said dish for generating electric fields in a relatively high frequency band that are linearly polarized in one direction; second linear radiating means extending through said dish and having radiating elements on either side thereof for generating electric fields in a relatively low frequency band that are linearly polarized perpendicular to said one direction; and polarization selective means on said dish for reflecting said electric fields that are linearly polarized in said one direction, and for passing said electric fields that are linearly polarized perpendicular to said one direction with substantially no reflection. - View Dependent Claims (2, 3, 4, 5)
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6. A compact antenna system for enclosure within a radome of predetermined size comprising:
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a non-conductive parabolic dish; first radiating means rigidly positioned in front of said dish for generating electric fields in one relatively high frequency band; second radiating means extending through said dish and having radiating elements on either side thereof for generating electric fields in one relatively low frequency band outside of said high frequency band; and a patterned plurality of spaced apart conductive means on said dish for reflecting said electric fields in said high frequency band and for passing said electric fields in said low frequency band with substantially no reflection. - View Dependent Claims (7, 8, 9, 10)
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Specification