Broadband antennas and electromagnetic field simulators
First Claim
1. An antenna comprising:
- an open horn waveguide with an upper and a lower surface, a mouth and a ground plane conductor forming a forward extension of the lower surface;
a thin conducting plate positioned to form a septum between the upper and lower surfaces of the horn waveguide, said conducting plate being insulated from said horn waveguide; and
a conducting section of approximately the same width as the septum, coupled thereto and protecting from and beyond the mouth of the horn waveguide, said conducting section extending initially substantially parallel to the ground plane conductor and then curving downwardly to terminate adjacent to it;
whereby the protecting conducting section functions as a radiating element.
1 Assignment
0 Petitions
Accused Products
Abstract
A structure for use in an antenna or as a broadband electromagnetic field simulator, having an open horn TEM waveguide coupled to launch energy in a strip line formed between a forwardly extending plate section and a ground plane. When used as a simulator the test volume is located outside the horn between the forwardly extending plate section and the ground plane. The plate section which functions as a radiating element initially extends parallel to the ground plane and then curves downwardly to terminate adjacent it. In alternative embodiments the plate section extends upwardly, initially with an exponential configuration. In a simulator embodiment it may then terminate at a vertical, grounded wall faced with anechoic material. The horn contains a flat conductor plate positioned parallel to and spaced from the top edge defining an asymmetrical transmission line within the horn. This plate conductor can be coupled to the forwardly extending plate section directly, by means of an RLC coupling network or by means of an array of laterally spaced conductors.
28 Citations
20 Claims
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1. An antenna comprising:
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an open horn waveguide with an upper and a lower surface, a mouth and a ground plane conductor forming a forward extension of the lower surface; a thin conducting plate positioned to form a septum between the upper and lower surfaces of the horn waveguide, said conducting plate being insulated from said horn waveguide; and a conducting section of approximately the same width as the septum, coupled thereto and protecting from and beyond the mouth of the horn waveguide, said conducting section extending initially substantially parallel to the ground plane conductor and then curving downwardly to terminate adjacent to it; whereby the protecting conducting section functions as a radiating element. - View Dependent Claims (2, 3, 4, 5)
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6. An antenna comprising:
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an open horn waveguide with an upper and a lower surface, a mouth and a ground plane conductor forming a forward extension of the lower surface; a thin conducting plate positioned to form a septum between the upper and lower surfaces of the horn waveguide; a conducting section of approximately the same width as the septum, coupled thereto and projecting from and beyond the mouth of the horn waveguide, said conducting section extending upwardly away from the ground plane conductor; and resistive means connected between a mid-point of the conducting section and the horn waveguide; whereby the projecting conducting section functions as a radiating element.
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7. An antenna comprising:
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an open horn waveguide with an upper and a lower surface, and a ground plane conductor forming a forward extension of the lower surface; a pair of conducting plates positioned to form an upper and lower septum, respectively, between the upper and lower surfaces of the horn waveguide; a conducting section spaced forwardly of the horn waveguide; and a plurality of laterally spaced conductors connecting a front edge of each septum to a rear edge of the conducting section; whereby the conducting section functions as a radiating element. - View Dependent Claims (8)
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9. A broadband electromagnetic field simulator comprising:
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an open horn waveguide with an upper and a lower surface, a mouth and a ground plane conductor forming a forward extension of the lower surface; a source of r.f. energy coupled to an apex of the horn waveguide; a thin conducting plate positioned to form a septum between the upper and lower surfaces of the horn waveguide, said conducting plate being insulated from said horn waveguide; and a conducting section of approximately the same width as the septum, coupled thereto and protecting from and beyond the mouth of the horn waveguide, said conducting section extending initially substantially parallel to the ground plane conductor and then curving downwardly to terminate adjacent to it; whereby the projecting conducting section functions as a radiating element and a space between it and the ground plane conductor defines a test volume. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A broadband electromagnetic field simulator comprising:
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an open horn waveguide with an upper and a lower surface, a mouth and a ground plane conductor forming a forward extension of the lower surface; a source of r.f. energy coupled to an apex of the horn waveguide; a thin conducting plate positioned to form a septum between the upper and lower surfaces of the horn waveguide; a vertical grounded wall spaced from and facing the mouth of the horn waveguide; and a conducting section of approximately the same width as the septum, coupled thereto and projecting from and beyond the mouth of the horn waveguide, said conducting section extending initially upwardly away from the ground plane conductor and then extending substantially horizontally to terminate at the vertical grounded wall; whereby the projecting conducting section functions as a radiating element and a space between it and the ground plane conductor defines a test volume. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification