Compact omnidirectional antennas having stacked reflector structures

A base station antenna, comprising:

• a first reflector structure having first and second generally opposed sides;
• a first array of radiating elements that are mounted to extend outwardly from the first side of the first reflector structure and a second array of radiating elements that are mounted to extend outwardly from the second side of the first reflector structure;
• a second reflector structure having third and fourth generally opposed sides;
• and
• a third array of radiating elements that are mounted to extend outwardly from the third side of the second reflector structure and a fourth array of radiating elements that are mounted to extend outwardly from the fourth side of the second reflector structure,
• wherein the first side is a first distance from the second side and the third side is a second distance from the fourth side, and
• wherein the second distance is different from the first distance.

A base station antenna, comprising:

• a first reflector structure having first and second generally opposed sides;
• a first array of radiating elements that are mounted to extend outwardly from the first side of the first reflector structure and a second array of radiating elements that are mounted to extend outwardly from the second side of the first reflector structure;
• a second reflector structure having third and fourth generally opposed sides;
• a third array of radiating elements that are mounted to extend outwardly from the third side of the second reflector structure and a fourth array of radiating elements that are mounted to extend outwardly from the fourth side of the second reflector structure;
• and
• a fifth array of radiating elements mounted to extend outwardly from the first reflector structure,
• wherein the first side is a first distance from the second side and the third side is a second distance from the fourth side, and
• wherein the second distance is different from the first distance,
• wherein the first reflector structure has a first transverse cross-section and the second reflector structure has a second transverse cross-section that is different from the first transverse cross-section,
• wherein a first perimeter of the first transverse cross-section is different than a second perimeter of the second transverse cross-section,
• wherein the first array of radiating elements are configured to operate in a first frequency band and the second array of radiating elements are configured to operate in a second frequency band that is at higher frequencies than the first frequency band, wherein the fifth array of radiating elements are configured to operate in a third frequency band that is at higher frequencies than the second frequency band, and wherein the second perimeter is greater than the first perimeter.

A base station antenna, comprising:

• a first reflector structure that extends along a first longitudinal axis and that has a transverse cross-section having a first perimeter;
• a plurality of arrays of first frequency band radiating elements that are mounted to extend outwardly from respective sides of the first reflector structure;
• a second reflector structure that extends along a second longitudinal axis and that has a transverse cross-section having a second perimeter that is different from the first perimeter;
• and
• a plurality of arrays of second frequency band radiating elements that are mounted to extend outwardly from respective sides of the second reflector structure, the first and second frequency band radiating elements having different configurations.

A base station antenna, comprising:

• a first reflector structure that extends along a first longitudinal axis and that has a transverse cross-section having a first perimeter;
• a plurality of arrays of first frequency band radiating elements that are mounted to extend outwardly from respective sides of the first reflector structure;
• a second reflector structure that extends along a second longitudinal axis and that has a transverse cross-section having a second perimeter that is different from the first perimeter;
• and
• a plurality of arrays of second frequency band radiating elements that are mounted to extend outwardly from respective sides of the second reflector structure, the first and second frequency band radiating elements having different configurations;
• and
• a third array of radiating elements that are configured to operate in a third frequency band, wherein the third array is mounted to extend outwardly from the first reflector structure,
• wherein the first array of radiating elements are configured to operate in a first frequency band and the second array of radiating elements are configured to operate in a second frequency band that is at higher frequencies than the first frequency band, wherein the third frequency band is at higher frequencies than the second frequency band, and wherein the second perimeter is greater than the first perimeter.