Ultra wide band radiators and related antennas arrays
A multi-band radiating array includes a reflector, a plurality of first radiating elements defining a first column on the reflector, a plurality of second radiating elements defining a second column on the reflector alongside the first column, and a plurality of third radiating elements defining a third column on the reflector between the first and second columns. The first radiating elements have a first operating frequency range, the second radiating elements have a second operating frequency range that is wider than the first operating frequency range, and the third radiating elements have a third operating frequency range that is lower than the second operating frequency range. Related radiating elements are also discussed.
1. A radiating element, comprising:
a plurality of arm segments defining at least one dipole antenna having a desired operating frequency range, wherein opposing ones of the arm segments define respective arm lengths that are about one-half wavelength or more with respect to a lower bound of the desired operating frequency range, and are about one full wavelength or less with respect to an upper bound of the desired operating frequency range; and
a stalk configured to suspend the arm segments above a planar reflector such that respective surfaces of the arm segments radially extend from an end of the stalk and parallel to the planar reflector, wherein corners of the respective surfaces of the arm segments are beveled.
2. The radiating element of claim 1 , wherein the at least one dipole antenna comprises first and second dipole antennas defined by opposing ones of the arm segments in a cross dipole arrangement.
3. The radiating element of claim 1 , wherein the respective arm lengths are about 0.8 of the full wavelength with respect to the upper bound of the desired operating frequency range.
4. The radiating element of claim 1 , wherein the corners of the respective surfaces of the arm segments are beveled at an angle of less than about 70 degrees but greater than about 20 degrees relative to the respective arm lengths.
5. The radiating element of claim 2 , wherein the first and second dipole antennas have respective arm widths that are perpendicular to the respective arm lengths thereof, wherein the respective arm widths are greater than about one-half of the respective arm lengths.
6. The radiating element of claim 1 , further comprising:
a director element protruding from an intersection between the arm segments at the end of the stalk, the director element comprising a surface extending parallel to the respective surfaces of the arm segments and suspended thereabove.
7. The radiating element of claim 2 , wherein the radiating element comprises a plurality of radiating elements respectively comprising the first and second dipole antennas in the cross dipole arrangement, wherein the radiating elements are aligned in a column to define an array.
8. The radiating element of claim 7 , wherein an inter-element spacing between adjacent ones of the radiating elements in the column is about 115 millimeters (mm).
9. The radiating element of claim 7 , wherein the plurality of radiating elements are first radiating elements, and wherein respective stalks of the first radiating elements are laterally aligned with respective stalks of second radiating elements of a second column to define respective rows of the array.
10. The radiating element of claim 9 , wherein the first radiating elements have respective shapes that differ from those of the second radiating elements.
11. The radiating element of claim 9 , wherein a second operating frequency range of the second radiating elements is narrower than the desired operating frequency range of the first radiating elements.
12. The radiating element of claim 11 , wherein the second operating frequency range overlaps with the desired operating frequency range.
13. The radiating element of claim 11 , wherein the desired operating frequency range is about 1.4 GHz to about 2.7 GHz, and wherein the second operating frequency range is about 1.7 GHz to about 2.7 GHz.
14. The radiating element of claim 1 , wherein the stalk comprises a feed board including feed lines that are configured to couple the arm segments to an antenna feed, and further comprising a serially connected inductor and capacitor coupling respective ones of the arm segments to the stalk.
15. The radiating element of claim 1 , wherein the desired operating frequency range is about 1.4 GHz to about 2.7 GHz.
16. A radiating element, comprising:
a plurality of arm segments defining at least one dipole antenna having a desired operating frequency range, wherein opposing ones of the arm segments define respective arm lengths that are about one-half wavelength or more with respect to a lower bound of the desired operating frequency range, and are about one full wavelength or less with respect to an upper bound of the desired operating frequency range; and
a stalk configured to suspend the arm segments above a planar reflector such that respective surfaces of the arm segments radially extend from an end of the stalk and parallel to the planar reflector, wherein corners of the respective surfaces of the arm segments are beveled at an angle of less than about 70 degrees but greater than about 20 degrees relative to the respective arm lengths.
17. The radiating element of claim 16 , wherein the at least one dipole antenna comprises first and second dipole antennas defined by opposing ones of the arm segments in a cross dipole arrangement.
18. The radiating element of claim 17 , wherein the respective arm lengths are about 0.8 of the full wavelength with respect to the upper bound of the desired operating frequency range.
19. The radiating element of claim 17 , wherein the first and second dipole antennas have respective arm widths that are perpendicular to the respective arm lengths thereof, wherein the respective arm widths are greater than about one-half of the respective arm lengths.
20. The radiating element of claim 16 , wherein the desired operating frequency range is about 1.4 GHz to about 2.7 GHz.