8T8R quasi-omnidirectional antenna
Disclosed is a quasi-omnidirectional antenna having three array faces, wherein each of the three array faces has a radiator array having a plurality of radiator columns. Each of the corresponding radiator columns on the radiator arrays are coupled together to a single pair of antenna ports, one per polarization. This results in a service beam having three gain lobes that can be swept in unison in a scan. By scanning the service beam, the antenna may enable a high-gain connection to a mobile device, emulating a high gain omnidirectional antenna. Further disclosed is a variation having four array faces spaced 90 degrees apart, which offers additional performance benefits.
1. An antenna, comprising:
a plurality of array faces spaced apart by an angular spacing, each of the array faces having a radiator array disposed thereon, each of the radiator arrays having a plurality of radiator columns, each of the plurality of radiator columns having a plurality of radiators, and each of the plurality of radiators having a pair of dipoles configured to radiate respectively in a first polarization and a second polarization,
wherein each respective radiator column of the plurality of radiator arrays is coupled to two antenna ports, a first of the two antenna ports corresponding to the first polarization and a second of the two antenna ports corresponding to the second polarization, and wherein the antenna is configured to provide a radiation pattern comprising a plurality of gain lobes that move in unison in response to differential amplitude and phase weighting performed by a base station.
2. The antenna of claim 1 , further comprising a calibration board, wherein the calibration board comprises:
a plurality of inputs, wherein a number of the plurality of inputs corresponds to twice a number of the plurality of radiator columns;
a calibration port;
a power divider circuit coupled to the plurality of inputs and the calibration port; and
a plurality of signal splitters, each of the signal splitters coupled to a corresponding input within the plurality of inputs via the power divider circuit, and each of the plurality of signal splitters having a number of signal outputs corresponding to a number of the plurality of array faces.
3. The antenna of claim 1 , wherein the plurality of array faces comprises three array faces, and wherein the angular spacing is 120 degrees.
4. The antenna of claim 1 , wherein the plurality of array faces comprises four array faces, and wherein the angular spacing is 90 degrees.
5. The antenna of claim 1 , wherein the plurality of radiator columns comprises four radiator columns.