Multi-band base station antennas having crossed-dipole radiating elements with generally oval or rectangularly shaped dipole arms and/or common mode resonance reduction filters

A dual-polarized radiating element, comprising:

• a first dipole that extends along a first axis, the first dipole including a first dipole arm and a second dipole arm;
• a second dipole that extends along a second axis, the second dipole including a third dipole arm and a fourth dipole arm and the second axis being generally perpendicular to the first axis,
• wherein each of the first through fourth dipole arms has first and second spaced apart-current paths, and
• wherein central portions of each of the first and second spaced apart-current paths of the first and second dipole arms extend in parallel to the first axis, and central portions of each of the first and second spaced apart-current paths of the third and fourth dipole arms extend in parallel to the second axis,
• wherein each of the first through fourth dipole arms has first and second spaced-apart conductive segments, and wherein the first current path is along the first conductive segment and the second current path is along the second conductive segment.

A dual-polarized radiating element for a base station antenna, comprising:

• a first dipole that extends along a first axis, the first dipole including a first dipole arm and a second dipole arm;
• a second dipole that extends along a second axis, the second dipole including a third dipole arm and a fourth dipole arm and the second axis being generally perpendicular to the first axis;
• wherein each of the first through fourth dipole arms has first and second spaced-apart conductive segments that define respective first and second current paths, and
• wherein each of the first and second conductive segments of the first through fourth dipole arms includes a plurality of widened sections and a plurality of narrowed meandered trace sections that are between adjacent ones of the widened sections, and
• wherein a first of the widened sections of the first dipole arm is wider than a first of the widened sections of the second dipole arm that is at the same distance from a point where the first and second axes cross as is the first of the widened sections of the first dipole arm.