Antenna devices to suppress ground plane interference
Antenna devices that include a frequency selective surface (FSS) resistive card (R-card) to suppress ground plane interference are provided. The antenna device can include a tightly coupled dipole array (TCDA), and the FSS R-card can be a saw-tooth ring that only attenuates the intended frequencies. The antenna device can be an extremely wideband phased array with integrated feeding network and spatial scanning down to 60°.
1. An antenna device, comprising:
a ground plane;
a substrate disposed on the ground plane;
a plurality of antenna elements disposed on the substrate; and
a frequency selective surface (FSS) resistive card (R-card) disposed between the ground plane and the plurality of antenna elements,
the FSS R-card being a ring FSS R-card comprising a grid of square rings with a plurality of teeth and a plurality of air gaps within the grid, the plurality of teeth and the plurality of air gaps being configured such that the FSS R-card attenuates periodic frequencies that correspond to cyclical ground plane short circuits.
2. The antenna device according to claim 1 , the FSS R-card being disposed in the substrate.
3. The antenna device according to claim 1 , further comprising a balun electrically connected to the plurality of antenna elements.
4. The antenna device according to claim 3 , the balun being a tapered stripline balun comprising an exponentially tapered stripline feed.
5. The antenna device according to claim 1 , the plurality of antenna elements being a tightly coupled dipole array (TCDA).
6. The antenna device according to claim 1 , each element of the TCDA having a width equal to λ high /2, where λ high is a wavelength at a highest frequency of operation of the antenna device.
7. The antenna device according to claim 1 , a diagonal length of each square ring being equal to λ high /2, where λ high is a wavelength at a highest frequency of operation of the antenna device.
8. The antenna device according to claim 1 , the FSS R-card being disposed horizontally such that the FSS R-card comprises an upper surface and a lower surface that are both parallel to an upper surface of the ground plane.
9. The antenna device according to claim 1 , a distance between the ground plane and a top portion of the plurality of antenna elements being equal to λ low /13.5, where λ low is a wavelength at a lowest frequency of operation of the antenna device.
10. The antenna device according to claim 1 , the plurality of antenna elements comprising capacitive overlaps between adjacent antenna elements.
11. The antenna device according to claim 1 , comprising exactly one FSS R-card.
12. An antenna device, comprising:
a ground plane;
a substrate disposed on the ground plane;
a tightly coupled dipole array (TCDA) comprising a plurality of antenna elements disposed on the substrate;
a frequency selective surface (FSS) resistive card (R-card) disposed between the ground plane and the plurality of antenna elements; and
a balun electrically connected to the plurality of antenna elements,
the balun being a tapered stripline balun comprising an exponentially tapered stripline feed, and
the FSS R-card being a ring FSS R-card comprising a grid of square rings with a plurality of teeth and a plurality of air gaps within the grid, the plurality of teeth and the plurality of air gaps being configured such that the FSS R-card attenuates periodic frequencies that correspond to cyclical ground plane short circuits.
13. The antenna device according to claim 12 , the FSS R-card being disposed in the substrate.
14. The antenna device according to claim 12 , each element of the TCDA having a width equal to λ high /2, where λ high is a wavelength at a highest frequency of operation of the antenna device.
15. The antenna device according to claim 12 , the FSS R-card being disposed horizontally such that the FSS R-card comprises an upper surface and a lower surface that are both parallel to an upper surface of the ground plane.
16. The antenna device according to claim 12 , a distance between the ground plane and a top portion of the plurality of antenna elements being equal to λ low /13.5, where λ low is a wavelength at a lowest frequency of operation of the antenna device.
17. The antenna device according to claim 12 , the plurality of antenna elements comprising capacitive overlaps between adjacent antenna elements.
18. The antenna device according to claim 12 , comprising exactly one FSS R-card.
19. An antenna device, comprising:
a ground plane;
a substrate disposed on the ground plane;
a plurality of antenna elements disposed on the substrate;
a frequency selective surface (FSS) resistive card (R-card) disposed between the ground plane and the plurality of antenna elements; and
a balun electrically connected to the plurality of antenna elements,
the FSS R-card being a ring FSS R-card comprising a grid of square rings with a plurality of teeth and a plurality of air gaps within the grid, the plurality of teeth and the plurality of air gaps being configured such that the FSS R-card attenuates periodic frequencies that correspond to cyclical ground plane short circuits,
the FSS R-card being disposed in the substrate,
the balun being a tapered stripline balun comprising an exponentially tapered stripline feed,
the plurality of antenna elements being a tightly coupled dipole array (TCDA),
each element of the TCDA having a width equal to λ high /2, where λ high is a wavelength at a highest frequency of operation of the antenna device,
a diagonal length of each square ring being equal to λ high /2,
the FSS R-card being disposed horizontally such that the FSS R-card comprises an upper surface and a lower surface that are both parallel to an upper surface of the ground plane,
a distance between the ground plane and a top portion of the plurality of antenna elements being equal to λ low /13.5, where λ low is a wavelength at a lowest frequency of operation of the antenna device,
the plurality of antenna elements comprising capacitive overlaps between adjacent antenna elements, and
the antenna device comprising exactly one FSS R-card.