Antenna and Sensor System for Sharply Defined Active Sensing Zones
First Claim
1. A compound antenna system having a sharply defined coverage zone, comprising:
- an antenna structure having a feed point for coupling signals to and from said compound antenna system; and
a shield structure;
said shield structure disposed or extending forward from said antenna structure toward said coverage zone;
said shield structure having an open aperture between said antenna structure and said coverage zone;
said open aperture configured for allowing direct line of sight radio frequency communication between said antenna structure and objects within said coverage zone;
said shield structure configured for providing radio frequency attenuation and/or blocking for signals from or to objects outside of said coverage zone;
wherein an edge of said shield structure is aligned between said antenna structure and an edge of said coverage zone.
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0 Petitions
Accused Products
Abstract
A sensor system having a sharply defined zone of active sensing comprising a compound antenna system comprising an antenna structure disposed in relation to a shield structure and spaced from the shield structure, the shield structure having an open aperture in front of the antenna structure in the direction of a lobe of sensitivity of the antenna structure. In various embodiments, the shield structure may be layered on the inside between the antenna and the shield structure with an RF absorbing material. The aperture may be formed in part by adjustable panels and the antenna spacing from the aperture may be adjustable by adjusting an antenna mounting position within the shield. The compound antenna system may be coupled to a receiver having a threshold response based on the compound antenna system response characteristic.
265 Citations
30 Claims
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1. A compound antenna system having a sharply defined coverage zone, comprising:
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an antenna structure having a feed point for coupling signals to and from said compound antenna system; and a shield structure; said shield structure disposed or extending forward from said antenna structure toward said coverage zone;
said shield structure having an open aperture between said antenna structure and said coverage zone;
said open aperture configured for allowing direct line of sight radio frequency communication between said antenna structure and objects within said coverage zone;said shield structure configured for providing radio frequency attenuation and/or blocking for signals from or to objects outside of said coverage zone; wherein an edge of said shield structure is aligned between said antenna structure and an edge of said coverage zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of producing a sharply defined coverage zone for an antenna structure, comprising:
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directing said antenna structure toward said coverage zone; producing a compound antenna system by; positioning a shield structure, at least in part, forward from said antenna structure toward said coverage zone; providing an open aperture through said shield structure, said open aperture allowing direct line of sight radio frequency communication between said antenna structure and objects within said coverage zone; configuring said shield structure to provide radio frequency attenuation and/or blocking for signals form or to objects outside of said coverage zone; and aligning an edge of said shield structure between said antenna structure and an edge of said coverage zone for enhancing a response slope of said compound antenna structure. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification