Parasitically coupled, complementary slot-dipole antenna element
First Claim
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1. A parasitically coupled, complementary slot-dipole antenna element adapted to be coupled to a source of excitation signals having a center frequency, said antenna element comprising:
- a driven, cavity-backed slot antenna element adapted to be coupled to said source of excitation signals, said cavity-based slot antenna element having a first axis and a slot with a longitudinal axis transverse to said first axis of said cavity-backed antenna element; and
a parasitic dipole element displaced a selected distance from said cavity-backed slot antenna element and having a longitudinal axis which is parallel with said first axis of said cavity-backed slot antenna element for producing a relatively symmetrical electromagnetic signature of increased bandwidth, said parasitic dipole element and said cavity-backed slot antenna element resonating approximately at said center frequency.
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Abstract
A parasitically coupled, complementary slot dipole antenna element includes a driven, cavity-backed slot antenna element and a parasitic dipole element transverse to the slot of the cavity-backed slot antenna element. The cavity-backed slot and parasitic dipole antenna elements resonate at about the center frequency of the excitation signals supplied to the cavity-backed slot antenna element in order to generate a relatively symmetrical electromagnetic signature and an increased bandwidth.
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Citations
34 Claims
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1. A parasitically coupled, complementary slot-dipole antenna element adapted to be coupled to a source of excitation signals having a center frequency, said antenna element comprising:
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a driven, cavity-backed slot antenna element adapted to be coupled to said source of excitation signals, said cavity-based slot antenna element having a first axis and a slot with a longitudinal axis transverse to said first axis of said cavity-backed antenna element; and a parasitic dipole element displaced a selected distance from said cavity-backed slot antenna element and having a longitudinal axis which is parallel with said first axis of said cavity-backed slot antenna element for producing a relatively symmetrical electromagnetic signature of increased bandwidth, said parasitic dipole element and said cavity-backed slot antenna element resonating approximately at said center frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A parasitically coupled, complementary slot-dipole antenna element coupled to a source of first and second excitation signals having first and second center frequencies, said antenna comprising:
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a driven, cavity-backed slot antenna element including a slot having two major magnetic field axes, said antenna element being coupled to said source of first and second excitation signals, said cavity and said slot antenna element being excited along said two axes by said first and second excitation signals, respectively; and a dual polarized, parasitic dipole antenna displaced a predetermined distance from said cavity-backed slot antenna element, said parasitic dipole having two major electric field axes aligned with said two magnetic axes of said slot and, together with said slot, resonating at approximately said first and second center frequency along said first and second major axes of said antenna elements. - View Dependent Claims (21, 22, 23, 24)
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25. An array of parasitically coupled, complementary slot dipole antenna elements adapted to be coupled to a feed distribution network generating excitation signals, each said complementary slot dipole antenna elements comprising:
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a driven, cavity-backed slot antenna element adapted to be coupled to said excitation signals from said feed distribution network, said cavity-backed slot antenna element having a first axis and a slot with a longitudinal axis transverse to said first axis of said cavity-backed antenna element; and a parasitic dipole element displaced a selected distance from said cavity-backed slot antenna element and having a longitudinal axis which is parallel with said first axis of said cavity-backed slot antenna element, - View Dependent Claims (27, 29, 32, 33, 34)
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26. said array of parasitically coupled complementary slot dipole antenna elements producing a relatively symmetrical electromagnetic signature and having an increased bandwidth.
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28. An array of parsitically coupled, complementary slot dipole antenna elements adapted to be coupled to a feed distribution network generating excitation signals, each said complementary slot-dipole antenna elements comprising:
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a driven, cavity-backed slot antenna element having a slot with two major magnetic field axes, said antenna element adapted to being coupled to said source of first and second excitation signals, said cavity-backed slot antenna element being excited along said two axes of said slot by said first and second excitation signals, respectively; and a parasitic dipole antenna displaced a selected distance from said cavity-backed slot antenna element, said parasitic dipole element having two major electric field axes aligned with said two axes of said slot and, together with slot, resontating at approximately said first and second center frequencies along with said first and second major axes of said antenna elements.
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30. A parasitically coupled, complementary slot-dipole antenna element adapted to be coupled to a source of excitation signals having a center frequency, said antenna element comprising:
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31. a driven, cavity-backed slot antenna element adapted to be coupled to said source of excitation signals, said cavity-based slot antenna element having a first axis and a slot with a longitudinal axis transverse to said first axis of said cavity-backed antenna element;
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a parasitic dipole element displaced a selected distance from said cavity-backed slot antenna element and having a longitudinal axis which is parallel with said first axis of said cavity-backed slot antenna element for producing a relatively symmetrical electromagnetic signature of increased bandwidth, said parasitic dipole element and said cavity-backed slot antenna element resonating approximately at said center frequency, said cavity-backed slot antenna element comprising a first printed circuit layer aligned on top of a second printed circuit layer, and a stripline between said first and second layers, said first printed circuit layer having a first conducting sheet as a top surface, said second layer having a second conducting sheet as a bottom surface, and said slot including an etched portion of said first conducting sheet, and said parasitic dipole element being disposed in a third layer on top of said first layer, and including a conducting strip on a top surface of said third layer.
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Specification