Antenna for combined surveillance and foliage penetration radar
First Claim
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1. An aperture sharing radar antenna for first and second radar apparatus operative in different frequency bands comprising in combination:
- a first radar antenna array including a plurality of waveguides having front and side walls coupled to and operable with said first radar apparatus in one frequency band, the front walls of said waveguides having a plurality of substantially parallel rows of multiple slots arranged along said front walls in a common plane; and
a second radar antenna array coupled to and operable with said second radar apparatus in another frequency band, said second array including a planar dielectric sheet and a stripline dipole element on said sheet operatively mounted transversely to said common plane along the front of said first radar antenna array extending parallel to and spaced from said multiple slots to avoid obstruction thereof and cause negligible interference to the effective operation of said first radar apparatus, said first antenna array acting as a reflector for said second antenna apparatus during operation of said second radar apparatus.
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Abstract
An L-band radar and antenna array operating with an existing X-band surveance radar to provide a foliage penetration capability. The foliage penetration antenna consists of an array of L-band, stripline dipole/director elements placed in front of an array of broadwall waveguide slots which define an X-band aperture. The X-band aperture in addition to its own function, serves as a reflector for the dipole/director elements. Aperture sharing is thus provided for a dual frequency antenna without increasing the size of the existing X-band aperture.
52 Citations
12 Claims
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1. An aperture sharing radar antenna for first and second radar apparatus operative in different frequency bands comprising in combination:
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a first radar antenna array including a plurality of waveguides having front and side walls coupled to and operable with said first radar apparatus in one frequency band, the front walls of said waveguides having a plurality of substantially parallel rows of multiple slots arranged along said front walls in a common plane; and a second radar antenna array coupled to and operable with said second radar apparatus in another frequency band, said second array including a planar dielectric sheet and a stripline dipole element on said sheet operatively mounted transversely to said common plane along the front of said first radar antenna array extending parallel to and spaced from said multiple slots to avoid obstruction thereof and cause negligible interference to the effective operation of said first radar apparatus, said first antenna array acting as a reflector for said second antenna apparatus during operation of said second radar apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification