Base station antennas having an active antenna module and related devices and methods
Base station antennas include an externally accessible active antenna module releasably coupled to a recessed segment that is over a chamber in the base station antenna and that is longitudinally and laterally extending along and across a rear of a base station antenna housing. The base station antenna housing has a passive antenna assembly that cooperates with the active antenna module.
1. A base station antenna comprising:
a base station housing;
a passive antenna assembly in the base station antenna housing;
a primary reflector in the base station antenna housing; and
a frequency selective surface and/or substrate in the base station antenna housing and coupled to the primary reflector or provided as an extension of the primary reflector at an upper portion of the base station antenna housing with the primary reflector positioned below the frequency selective surface and/or substrate, wherein the frequency selective surface and/or substrate has a pattern configured to reflect radio frequency energy in some frequencies and to propagate radio frequency energy in other frequencies, and wherein the pattern changes in different areas of a monolithic portion of the frequency selective surface and/or substrate.
2. The base station antenna of claim 1 , wherein the frequency selective surface and/or substrate comprises different size and/or shape metal patches in the different areas.
3. The base station antenna of claim 1 , wherein the base station antenna further comprises:
a mounting structure bracket coupled to the base station antenna housing and to a pole; and
an active antenna module coupled to the base station antenna housing and positioned between the pole and the base station antenna housing.
4. A base station antenna comprising:
a base station housing;
a passive antenna assembly in the base station antenna housing;
a primary reflector in the base station antenna housing; and
a frequency selective surface and/or substrate in the base station antenna housing and coupled to the primary reflector or provided as an extension of the primary reflector at an upper portion of the base station antenna housing, wherein the frequency selective surface and/or substrate has a pattern configured to reflect radio frequency energy in some frequencies and to propagate radio frequency energy in other frequencies, and wherein the pattern changes in different areas of the frequency selective surface and/or substrate,
wherein an active antenna module comprising multiple columns of radiating elements resides behind and aligned with the frequency selective surface and/or substrate and behind a rear of the base station antenna housing.
5. A base station antenna comprising:
a base station housing;
a passive antenna assembly in the base station antenna housing;
a primary reflector in the base station antenna housing;
a frequency selective surface and/or substrate in the base station antenna housing and coupled to the primary reflector or provided as an extension of the primary reflector at an upper portion of the base station antenna housing, wherein the frequency selective surface and/or substrate has a pattern configured to reflect radio frequency energy in some frequencies and to propagate radio frequency energy in other frequencies, and wherein the pattern changes in different areas of the frequency selective surface and/or substrate;
a first array comprising a first column of radiating elements in the base station antenna housing and mounted to extend along a right side portion of the base station antenna housing;
a second array comprising a second column of radiating elements in the base station antenna housing and mounted to extend along a left side portion of the base station antenna housing; and
a multiple column array of radiating elements that is at least partly positioned laterally between the first column and the second column of radiating elements.
6. The base station antenna of claim 1 , wherein the frequency selective surface and/or substrate comprises one or more respective cutouts aligned with a corresponding feed stalk behind a corresponding radiating element of the first and second arrays.
7. The base station antenna of claim 5 , wherein the multiple column array is provided in an active antenna module.
8. The base station antenna of claim 7 , wherein the base station antenna housing has a longitudinal extent and a lateral extent, and wherein the active antenna module is positioned at a top portion of the base station antenna housing and extends across at least a major portion of the lateral extent.
9. A base station antenna comprising:
a base station antenna housing;
a first reflector held in the base station antenna housing with first and second linear arrays of radiating elements residing in front of the first reflector, wherein the first and second linear arrays are laterally spaced apart; and
an active antenna module comprising a second reflector and a multiple column array of radiating elements projecting forward of the second reflector that are configured to reside behind the first reflector,
wherein a subset of the first reflector comprises a frequency selective surface and/or substrate aligned with the second reflector, wherein the frequency selective surface and/or substrate has a pattern configured to propagate radio frequency energy from the multiple column array of radiating elements through the frequency selective surface and/or substrate and reflect and/or block radio frequency energy from the first and second linear arrays operating in other frequencies, and wherein the pattern changes in different areas of the frequency selective surface and/or substrate.
10. The base station antenna of claim 9 , further comprising a mounting bracket coupled to an upper portion of the base station antenna housing and configured to attach to the active antenna module.
11. The base station antenna of claim 9 , wherein the base station antenna housing has a rear wall with a recess that extends laterally across at least 30% of a width of the rear wall, and wherein the active antenna module is aligned with the recess.
12. The base station antenna of claim 9 , wherein the frequency selective surface and/or substrate comprises one or more respective cutouts aligned with a corresponding feed stalk behind a corresponding radiating element of the first and second linear arrays.
13. The base station antenna of claim 5 , wherein one or more feed stalk coupled to one or more radiating elements of the first column of radiating elements projects laterally inward from the right side portion of the base station antenna housing in front of the frequency selective surface and/or substrate, and wherein one or more feed stalk coupled to one or more radiating elements of second column of radiating elements projects laterally inward from the left side portion of the base station antenna housing in front of the frequency selective surface and/or substrate.
14. The base station antenna of claim 5 , wherein some of the radiating elements in the first column and some of the radiating elements in the second column extend forward of the frequency selective surface and/or substrate and some others of the radiating elements in the first column and some others of the radiating elements in the second column extend forward of the primary reflector.
15. The base station antenna of claim 1 , further comprising one or more feed boards coupled to one or more feed stalks, both oriented perpendicular to the frequency selective surface and/or substrate.
16. The base station antenna of claim 15 , wherein the primary reflector or the frequency selective surface and/or substrate has at least one side wall that extends in a front to back direction of the base station antenna housing or the primary reflector and the frequency selective surface and/or substrate has at least one side wall that extends in a front to back direction of the base station antenna housing.