Low profile telecommunications antenna

Patent metadata

Field	Value
Publication number	US-10680347-B2
Application number	US-201715663266-A
Country	US
Kind code	B2
Filing date	Jul 28, 2017
Priority date	Jul 29, 2016
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

A telecommunications antenna comprising a plurality of unit cells each including at least one radiator which transmits RF energy within a bandwidth range which is a multiple of another radiator. The radiators are proximal to each other such that a resonant condition may be induced into the at least one radiator upon activation of the other radiator. At least one of the radiators is segmented into capacitively-connected radiator elements to suppress a resonance response therein upon activation of the other of the radiator.

First claim

The following is claimed:

1. An antenna, comprising:
a plurality of first unit cells, wherein each first unit cell includes a first pair of low-band radiators and a first pair of high-band radiators, each low-band radiator having an L-shape defined by at least one arm projecting from a stem, wherein the first pair of low-band radiators and the first pair of high-band radiators are configured such that the at least one arm projects inwardly toward an elongate axis of the first unit cells and between the pair of high band radiators; and,
a plurality of second unit cells, wherein each of the second unit cells includes a second plurality of low-band radiators, each low-band radiator having an L-shape defined by at least one arm projecting from a stem, and a second pair of high-band radiators, wherein the second plurality of low-band radiators and the second pair of high-band radiators are configured such that the at least one arm projects outward away from an elongate axis of the unit cells and between the pair of high band radiators;
and wherein the low-band radiators have a relative azimuth spacing corresponding to an array factor in an azimuth direction producing a fast roll-off radiation pattern.

2. The antenna of claim 1 , wherein the azimuth spacing is configured to cause a fast roll off in the azimuth direction with a 3 dB beam width of substantially 60 degrees.

3. The antenna of claim 2 , wherein the azimuth spacing is between about 6.2 inches to about and 6.8 inches.

4. The antenna of claim 2 , wherein the azimuth spacing is 6.50 inches.

5. The antenna of claim 2 , wherein the azimuth spacing is between about 0.40λ to about 0.48λ at a low-band frequency of about 797 MHz.

6. The antenna of claim 2 wherein the azimuth spacing is 0.44λ at a low-band frequency of about 797 MHz.

7. The antenna of claim 1 wherein each of the first and second pairs of low-band radiators comprises a first low-band radiator corresponding to a first polarization orientation and a second low-band radiator corresponding to a second polarization orientation, wherein the first low-hand radiator of the first pair of low-band radiators has a position along the azimuth axis that is opposite to a position along the azimuth axis of the first low-band radiator of the second pair of low-band radiators.

8. The antenna of claim 1 , wherein each of the low-band radiators comprises a substantially L-shape.

9. The antenna of claim 8 , wherein each of the low-band radiators comprises a plurality of radiator elements that are separated by a dielectric gap, wherein each of the plurality of radiator elements has a length that is less than one half a wavelength corresponding to a high band frequency, and wherein each of the low-band radiators includes a plurality of first coupling elements, each coupling element disposed at a corresponding dielectric gap.

10. The antenna of claim 1 , further comprising a directional reflector disposed along at least one edge of the antenna along the pitch axis of the antenna.

11. The antenna of claim 1 , wherein each low-band radiator is spaced relative to the high-band radiators to mitigate shadowing.

12. An antenna, comprising:
a plurality of alternating first and second unit cells each comprising a pair of low-band radiators, the first unit cell having a pair of back-to-back, L-shaped radiators and the second unit cell having a pair of face-to-face L-shaped radiators, the L-shaped radiators of the first and second unit cells defining an azimuth spacing;
each of the first and second unit cells having at least one pair of high-band radiators, the high-band radiators of the first unit cell disposed outboard of each of the back-to-back L-shaped radiators, and the high-band radiators of the second unit cell disposed inboard of each of the face-to-face L-shaped radiators;
each low band radiator having the at least one aria of each low-band radiator projecting outwardly away front a central elongate axis and between the pair of high band radiators with respect to the first unit cells,
with respect to each of the first unit cells, each low band radiator having at least one arm projecting outwardly toward a central elongate axis and between the pair of high band radiators;
with respect to each of the second unit cells, each low band radiator having, at least one arm projecting inwardly toward a central elongate axis and between the pair of high band radiators;
wherein the azimuth spacing of the low-band radiators of the first and second unit cells corresponds to an array factor yielding a fast-roll off radiation pattern.

13. The antenna of claim 12 , wherein the azimuth spacing is configured to cause a fast roll off in an azimuth direction with a 3 dB beam width of substantially 60 degrees.

14. The antenna of claim 12 wherein each of the first and second pairs of low-band radiators comprises a first low-band radiator corresponding to a first polarization orientation and a second low-band radiator corresponding to a second polarization orientation, wherein the first low-band radiator of the first pair of low-band radiators has a position along an azimuth axis that is opposite to a position along the azimuth axis of the first low-band radiator of the second pair of law-band radiators.

15. The antenna of claim 12 , wherein the azimuth spacing is between about 6.2 inches to 6.8 inches.

16. The antenna of claim 15 , wherein the azimuth spacing is 6.50 inches.

17. The antenna of claim 12 , wherein the azimuth spacing is between about 0.40λ to about 0.48λ—at a low-band frequency of about 797 MHz.

18. The antenna of claim 17 wherein the azimuth spacing is 0.44λ at a low-band frequency of about 797 MHz.

19. The antenna of claim 12 , wherein each of the low-hand radiators comprises a plurality of radiator elements that are separated by dielectric gap, wherein each of the plurality of radiator elements has a length that is less than one half a wavelength corresponding to a high hand frequency, and wherein each of the low-hand radiators includes a plurality of first coupling elements, each coupling element disposed at a corresponding dielectric gap.

20. The antenna of claim 19 , wherein each of the plurality of radiator elements has a length that is less than one seventh of a wavelength corresponding to the high band frequency.

21. The antenna of claim 12 , further comprising a directional reflector disposed along at least one edge of antenna along a pitch axis of the antenna.

22. The antenna of claim 12 , wherein the low-band radiators are spaced relative to the high-band radiators to mitigate shadowing.

23. The antenna of claim 12 , wherein the high-band radiators comprise a pair of aligned cruciform radiators, wherein low-band radiators comprise an L-shaped radiator having at least one arm projecting from a base of the L-Shaped radiator, wherein each cruciform shaped radiator defines a substantially polygonal-shaped region corresponding to the planform area of each cruciform and wherein the arm of an L-shaped radiator bifurcates the pair of cruciform-shaped radiators without encroaching on the planform area of the cruciform-shaped radiator plates.

24. The antenna of claim 23 , wherein each cruciform radiator comprises a plurality of high band radiator elements separated by a dielectric gap and at least one coupling element disposed across the dielectric gap to capacitively couple the plurality of high band radiator elements.

25. The antenna o

Assignees

• John Mezzalingua Ass Llc

Inventors

• Jang Taehee
• Bamford Lance D
• Le Kevin T
• Wayton Evan C
• Anderson Cody J
• Ragos Jordan
• Sundararajan Niranjan

Classifications

• H01Q21/26

  Turnstile or like antennas comprising arrangements of three or more elongated elements disposed radially and symmetrically in a horizontal plane about a common centre · CPC title

• H01Q21/30

  Combinations of separate antenna units operating in different wavebands and connected to a common feeder system · CPC title

• H01Q9/30

  with feed to end of elongated active element, e.g. unipole (H01Q9/44 takes precedence) · CPC title

• H01Q15/246

  rotating the plane of polarisation of a linear polarised wave (guided wave H01P1/165) · CPC title

• H01Q21/10 Primary

  Collinear arrangements of substantially straight elongated conductive units · CPC title