DIRECTIONAL PLANAR LOG-SPIRAL SLOT ANTENNA
First Claim
1. A directional planar log-spiral slot antenna comprising:
- a log-spiral slot antenna comprisinga feed-point configured to transfer energy to and from said log-spiral slot antenna,log-spiral shaped slots that begin at said feed-point and spiral outward and away from said feed-point toward an outer portion of said log-spiral slot antenna,an antenna impedance;
an energy absorbent backing;
an energy absorbent siding coupled with said energy absorbent backing and further coupled with said log-spiral slot antenna;
a cavity behind said log-spiral slot antenna and in front of a portion of said energy absorbent backing;
a cable connector having an input impedance wherein said cable connector is coupled to the feed-point; and
,a container configured to hold said log-spiral slot antenna, said energy absorbent backing, said energy absorbent siding, said cavity, said cable connector.
1 Assignment
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Accused Products
Abstract
Directional wide band antenna that may be utilized to enhance cell phone coverage within a building, or for signals intelligence collection (SIGINT). Includes a log-spiral slot antenna with feed-point configured to transfer energy to/from the antenna. Includes an energy absorbent backing and an energy absorbent siding coupled with the log-spiral slot antenna. Includes a cavity behind the log-spiral slot antenna and in front of the energy absorbent backing. Includes a cable connector coupled to a tapered microstrip line coupled to the feed-point wherein the tapered microstrip line is configured to transform the input impedance to the antenna impedance. Housed in a container configured to hold the above listed components. Energy absorbent siding, cavity and energy absorbent backing greatly reduces back lobes. Another embodiment has log-spiral shaped slots at an outer portion of the log-spiral slot antenna overlap with the energy absorbent siding and wherein the feed-point overlaps the cavity.
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Citations
20 Claims
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1. A directional planar log-spiral slot antenna comprising:
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a log-spiral slot antenna comprising a feed-point configured to transfer energy to and from said log-spiral slot antenna, log-spiral shaped slots that begin at said feed-point and spiral outward and away from said feed-point toward an outer portion of said log-spiral slot antenna, an antenna impedance; an energy absorbent backing; an energy absorbent siding coupled with said energy absorbent backing and further coupled with said log-spiral slot antenna; a cavity behind said log-spiral slot antenna and in front of a portion of said energy absorbent backing; a cable connector having an input impedance wherein said cable connector is coupled to the feed-point; and
,a container configured to hold said log-spiral slot antenna, said energy absorbent backing, said energy absorbent siding, said cavity, said cable connector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for constructing a directional planar log-spiral slot antenna comprising:
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coupling a log-spiral slot antenna to a container wherein said log-spiral antenna comprises a feed-point configured to transfer energy to and from said log-spiral slot antenna, log-spiral shaped slots that begin at said feed-point and spiral outward and away from said feed-point toward an outer portion of said log-spiral slot antenna, an antenna impedance; coupling an energy absorbent backing to said container; coupling an energy absorbent siding with said energy absorbent backing and with said log-spiral slot antenna; configuring a cavity behind said log-spiral slot antenna and in front of said energy absorbent backing; coupling a cable connector having an input impedance to said container; and
,coupling the cable connector and the feed-point. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification