Base station antenna
The present invention provides a base station antenna, which includes a plurality of radiating unit arrays, a plurality of feeding modules, and a calibrating module. Each radiating unit array includes a plurality of radiating units. Each feeding module includes a power division network and a radio frequency inlet, the power division network is configured for allocating an input power from the radio frequency inlet to each radiating unit of the radiating unit array. The calibrating module includes a plurality of directional couplers and combiners, a coupling end of each directional coupler connected with the radio frequency inlet is defined as a coupler input terminal, a coupling end of each directional coupler connected with the combiner is defined as a coupling terminal, and the calibrating module is configured for monitoring and comparing signal amplitudes and phases of each of the radio frequency inlets.
1. A base station antenna, comprising: a plurality of radiating unit arrays, a plurality of feeding modules arranged at front ends of the radiating unit arrays, and a calibrating module; wherein,
each radiating unit array comprises a plurality of radiating units;
each feeding module comprises a power division network and a radio frequency inlet which are arranged at the front end of one of the radiating unit arrays in sequence, the power division network being configured for allocating an input power from the radio frequency inlet to each radiating unit of the radiating unit array;
the calibrating module comprises a plurality of directional couplers and combiners arranged at front ends of the directional couplers, a coupling end of each directional coupler connected with the radio frequency inlet being defined as a coupler input terminal, a coupling end of each directional coupler connected with the combiner being defined as a coupling terminal, and the calibrating module being configured for monitoring and comparing signal amplitudes and phases of each of the radio frequency inlets.
2. The base station antenna of claim 1 , wherein a through terminal of each directional coupler communicates with an input terminal of the corresponding power division network.
3. The base station antenna of claim 1 , wherein an isolating terminal of each directional coupler is matched with one resistor of 50 ohms.
4. The base station antenna of claim 1 , wherein the combiner comprises a combined output port, a plurality of combined input ports connected with the coupling terminals of the directional couplers, and a multistage combiner for connecting the combined output port with the corresponding combined input port.
5. The base station antenna of claim 1 , wherein the feeding module and the calibrating module are integrally arranged on a circuit board, the circuit board comprising a power division network signal line layer, a first substrate, a first ground layer, a second substrate, a calibrating module signal line layer, a third substrate, and a second ground layer, which are sequentially stacked.
6. The base station antenna of claim 5 , wherein the power division network signal line layer, the first substrate, and the first ground layer are formed on a double-sided PCB board, the calibrating module signal line layer, the third substrate, and the second ground layer are formed on another double-sided PCB board, and the second substrate is an adhesive board.
7. The base station antenna of claim 1 , comprising 64 radio frequency inlets and six stages of combiners.
8. The base station antenna of claim 6 , wherein the first substrate defines a first metal via hole, and the power division network signal line layer is electrically connected with the calibrating module signal line layer through the first metal via hole.