Base station antennas having multi-band radiating units that include integrated first and second frequency band radiating elements
Base station antennas include a first array having a plurality of first frequency band radiating elements and a second array having a plurality of second frequency band radiating elements, where the second frequency band being different than the first frequency band. A first of the first frequency band radiating elements includes a first feed stalk and a first of the second frequency band radiating elements includes a second feed stalk that extends through an aperture in the first feed stalk.
1 . A base station antenna comprising:
a first array having a plurality of first frequency band radiating elements; and
a second array having a plurality of second frequency band radiating elements, the second frequency band being different than the first frequency band,
wherein a first of the first frequency band radiating elements includes a first feed stalk and a first of the second frequency band radiating elements includes a second feed stalk that extends through an aperture in the first feed stalk,
wherein the first of the first frequency band radiating elements comprises a cross-dipole radiating elements that includes a first dipole arm and a second dipole arm that each extend along a first axis to form a first dipole radiator and a third dipole arm and a fourth dipole arm that each extend along a second axis to form a second dipole radiator, the second axis extending perpendicular to the first axis,
wherein the first of the second frequency band radiating elements includes a dipole radiator printed circuit board, and the first feed stalk extends through an opening in the dipole radiator printed circuit board.
2 . The base station antenna of claim 1 , further comprising a frequency selective surface mounted rearward of the first of the first frequency band radiating elements and rearward of the first of the second frequency band radiating elements, and a third antenna array having a plurality of third frequency band radiating elements that are mounted rearward of the frequency selective surface, where the third frequency band radiating elements are configured to operate in at least a portion of the 3.1-5.8 GHz frequency band.
3 . The base station antenna of claim 2 , wherein the frequency selective surface is configured to be substantially transparent to RF energy in the third frequency band and to substantially reflect RF energy in at least one of the first and second frequency bands.
4 . A base station antenna comprising:
a first array having a plurality of first frequency band radiating elements; and
a second array having a plurality of second frequency band radiating elements, the second frequency band being different than the first frequency band,
wherein a first of the first frequency band radiating elements includes a first feed stalk and a first of the second frequency band radiating elements includes a second feed stalk that extends through an aperture in the first feed stalk,
wherein the first feed stalk comprises a first feed stalk printed circuit board and the second feed stalk comprises a second feed stalk printed circuit board.
5 . The base station antenna of claim 4 , wherein the first of the second frequency band radiating elements includes a dipole radiator printed circuit board, and the first feed stalk printed circuit board extends through an opening in the dipole radiator printed circuit board.
6 . The base station antenna of claim 4 , wherein the first of the second frequency band radiating elements further includes a third feed stalk printed circuit board that extends through the aperture in the first feed stalk.
7 . The base station antenna of claim 4 , wherein the first feed stalk printed circuit board is the only feed stalk printed circuit board included in the first of the first frequency band radiating elements.
8 . A base station antenna comprising:
a first array having a plurality of first frequency band radiating elements; and
a second array having a plurality of second frequency band radiating elements, the second frequency band being different than the first frequency band,
wherein a first of the first frequency band radiating elements includes a first feed stalk and a first of the second frequency band radiating elements includes a second feed stalk that extends through an aperture in the first feed stalk,
wherein the first of the first frequency band radiating elements comprises a first crossed-dipole radiating element, the first of the second frequency band radiating elements comprises a second crossed-dipole radiating element, a first dipole radiator of the second crossed-dipole radiating element overlaps, in a forward direction, a first dipole radiator of the first crossed-dipole radiating element, and a second dipole radiator of the second crossed-dipole radiating element overlaps, in the forward direction, a second dipole radiator of the first crossed-dipole radiating element.
9 . A base station antenna comprising:
a reflector;
a first cross-dipole radiating element that is configured to operate in a first frequency band, the first cross-dipole radiating element including a first feed stalk that extends in a forward direction and a first dipole arm and a second dipole arm that each extend along a first axis to form a first dipole radiator and a third dipole arm and a fourth dipole arm that each extend along a second axis to form a second dipole radiator, the second axis extending perpendicular to the first axis; and
a second radiating element that is configured to operate in a second frequency band, the second radiating element including a second feed stalk that extends in the forward direction and fifth through eighth dipole arms, the second frequency band being different than the first frequency band,
wherein the first feed stalk extends in between the fifth dipole arm and the seventh dipole arm.
10 . The base station antenna of claim 9 , wherein the first feed stalk also extends in between the sixth dipole arm and the eighth dipole arm.
11 . The base station antenna of claim 9 , wherein the first feed stalk comprises a first feed stalk printed circuit board and the second feed stalk comprises a second feed stalk printed circuit board.
12 . The base station antenna of claim 11 , wherein the first cross-dipole radiating element includes a dipole radiator printed circuit board, and the first feed stalk printed circuit board extends through an opening in the dipole radiator printed circuit board.
13 . The base station antenna of claim 9 , wherein the first feed stalk intersects the second feed stalk at an angle of about 90°.
14 . The base station antenna of claim 9 , wherein the second radiating element further includes a third feed stalk printed that extends through the aperture in the first feed stalk.
15 . The base station antenna of claim 14 , wherein the first feed stalk intersects the second feed stalk at an angle of about 45° and intersects the third feed stalk at an angle of about −45°.
16 . The base station antenna of claim 9 , wherein the first cross-dipole radiating element and the second radiating element are mounted on a feedboard printed circuit board, and an axis that is perpendicular to a major surface of the feedboard printed circuit board extends through a center of the first of the first cross-dipole radiating element and through a center of the second radiating element.
17 . A multi-band radiating unit, comprising:
a first cross-dipole radiating element that includes a first dipole radiator, a second dipole radiator and a first feed stalk printed circuit board that has feed lines for both the first dipole radiator and the second dipole radiator; and
a second cross-dipole radiating element that third dipole radiator and a fourth dipole radiator, a second feed stalk printed circuit board and a third feed stalk printed circuit board,
wherein the first feed stalk printed circuit board intersects the second feed stalk printed circuit board and the third feed stalk printed circuit board, and
wherein the first and second dipole radiators are configured to operate in a different frequency band than are the third and fourth dipole radiators.
18 . The multi-band radiating unit of claim 17 , wherein the third and fourth dipole radiators are implemented on a dipole radiator printed circuit board, and the first feed stalk printed circuit board extends through an opening in the dipole radiator printed circuit board.
19 . The multi-band radiating unit of claim 17 , wherein the first feed stalk printed circuit board is the only feed stalk printed circuit board included in the first radiating element.
20 . The multi-band radiating unit of claim 17 , wherein the first feed stalk printed circuit board is mounted to extend forwardly from a major surface of a feedboard printed circuit board, the major surface extending in a horizontal direction and a vertical direction, and a distal end of the first feed stalk printed circuit board is offset from a base of the first feed stalk printed circuit board in the forward direction and in at least one of the horizontal and vertical directions.