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 multi-band radiating array, comprising:
a planar reflector;
a plurality of first radiating elements defining a first column on the planar reflector, the first radiating elements having a first operating frequency range;
a plurality of second radiating elements defining a second column on the planar reflector alongside the first column, the second radiating elements having respective shapes that differ from those of the first radiating elements and provide a second operating frequency range that is wider than the first operating frequency range;
a plurality of third radiating elements defining a third column on the planar reflector between the first and second columns, the third radiating elements having a third operating frequency range that is lower than the second operating frequency range.
2. The array of claim 1 , wherein the first and second radiating elements respectively comprise:
a plurality of arm segments defining first and second dipole antennas in a cross dipole arrangement; and
a stalk that suspends the arm segments above the 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 of the second radiating elements are beveled.
3. The array of claim 2 , wherein:
the first and second dipole antennas have respective arm lengths defined between opposing ends thereof; and
the respective arm lengths of the first and second dipole antennas of the second radiating elements are about one-half wavelength or more with respect to a lower bound of the second operating frequency range, and are about one full wavelength or less with respect to an upper bound of the second operating frequency range.
4. The array of claim 2 , wherein the corners of the respective surfaces of the arm segments of the second radiating elements are beveled at an angle of less than about 70 degrees but greater than about 20 degrees relative to the respective arm lengths thereof.
5. The array of claim 2 , wherein the first and second dipole antennas of the second radiating elements have respective arm widths in directions perpendicular to the respective arm lengths thereof, wherein the respective arm widths are greater than about one-half of the respective arm lengths thereof.
6. The array of claim 2 , wherein the first and second radiating elements respectively comprise:
a director element protruding from an intersection between the arm segments at the end of the stalk thereof, the director element comprising a surface extending parallel to the planar reflector and suspended above the arm segments thereof.
7. The array of claim 2 , wherein the stalk comprises a feed board including feed lines that are configured to couple the arm segments to an antenna feed, wherein the first and second radiating elements further respectively comprise a serially connected inductor and capacitor coupling respective ones of the arm segments thereof to the stalk thereof,
wherein respective combinations of the feed board and the arm segments of the respective first and second radiating elements do not resonate in the third operating frequency range.
8. The array of claim 1 , wherein the first and second radiating elements comprise a same inter-element spacing between adjacent ones thereof in the first and second columns, respectively.
9. The array of claim 8 , wherein the inter-element spacing is about 115 millimeters (mm).
10. The array of claim 1 , wherein respective stalks of the first radiating elements of the first column are laterally aligned with respective stalks of the second radiating elements of the second column to define respective rows.
11. The array of claim 1 , wherein the first operating frequency range is about 1.7 GHz to about 2,7 GHz, wherein the second operating frequency range is about 1.4 GHz to about 2.7 GHz, and wherein the third operating frequency range is about 694 MHz-960 MHz.
12. The array of claim 3 , wherein the respective arm lengths are about 0.8 of the full wavelength with respect to the upper bound, of the second operating frequency.
13. The array of claim 5 , wherein an upper bound of the second operating frequency range is about twice a lower bound thereof.
14. The array of claim 1 , wherein the second operating frequency range overlaps with the first operating frequency range and/or with the third operating frequency range.