Methods of identifying electrical connections between a radio frequency circuit and a radio, and related radio frequency circuits
Methods of identifying electrical connections between primary ports of a radio frequency circuit and primary ports of a radio are provided. A method of identifying the electrical connections includes receiving a radio frequency signal via each of the primary ports of the radio frequency circuit. Moreover, the method includes providing, by the radio frequency circuit, different responses to the radio frequency signal that is received via the primary ports, respectively, of the radio frequency circuit. In some embodiments, the different responses are different frequency responses or different delay responses. Related radio frequency circuits are also provided.
1. A radio frequency (RF) circuit comprising:
a plurality of arrays of radiating elements;
a plurality of primary ports that are coupled to the arrays, respectively; and
a secondary port that is coupled to the primary ports via a plurality of different-length RF transmission paths, respectively,
wherein, to identify electrical connections between the primary ports and a radio, the different-length RF transmission paths are configured to provide different responses, respectively, to an RF signal that is received via each of the primary ports.
2. The RF circuit of claim 1 , wherein the RF circuit is a base station antenna and further comprises:
a plurality of phase shifters that are coupled between the arrays, respectively, and the primary ports, respectively.
3. The RF circuit of claim 2 , further comprising a plurality of RF couplers that are coupled between the phase shifters, respectively, and the primary ports, respectively.
4. The RF circuit of claim 3 , further comprising a plurality of power dividers, wherein the RF couplers are further coupled to the power dividers.
5. The RF circuit of claim 4 , wherein two of the different-length RF transmission paths are coupled to two inputs, respectively, of a first of the power dividers.
6. The RF circuit of claim 5 , further comprising a calibration printed circuit board (PCB) that comprises the power dividers and the different-length RF transmission paths, wherein the secondary port comprises a calibration port of the RF circuit.
7. The RF circuit of claim 6 ,
wherein the primary ports are further coupled to a plurality of primary ports, respectively, of the radio, and
wherein the calibration port is coupled to a secondary port of the radio.
8. The RF circuit of claim 1 , wherein a plurality of equal-length RF transmission paths further couple the primary ports, respectively, to the secondary port.
9. The RF circuit of claim 8 , further comprising a plurality of RF switches that are coupled between the primary ports, respectively, and the secondary port.
10. The RF circuit of claim 9 , wherein a first of the different-length RF transmission paths and a first of the equal-length RF transmission paths are coupled to a first of the RF switches.
11. The RF circuit of claim 10 , wherein the first of the different-length RF transmission paths and the first of the equal-length RF transmission paths are coupled between the first of the RF switches and a first of another plurality of RF switches.
12. The RF circuit of claim 10 , further comprising a plurality of power dividers, wherein the first of the RF switches and a second of the RF switches are coupled to two inputs, respectively, of a first of the power dividers.
13. A radio frequency (RF) circuit comprising:
first and second primary ports;
a secondary port that is coupled to the first and second primary ports via first and second variable-frequency-response circuitry, respectively; and
wherein the first and second variable-frequency-response circuitry comprise first and second RF switches, respectively, and wherein the first and second RF switches are coupled to first and second different-length RF transmission paths, respectively,
wherein each of the first and second variable-frequency-response circuitry provides a frequency-selective RF transmission path that generates a unique response to an RF signal at the first and second primary ports, respectively.
14. The RF circuit of claim 13 , wherein the first and second different-length RF transmission paths are terminated by open circuit or by short circuit.
15. The RF circuit of claim 13 , further comprising a power divider, wherein the first and second variable-frequency-response circuitry are coupled to two inputs, respectively, of the power divider.
16. A method of identifying electrical connections between primary ports of a radio frequency (RF) circuit and primary ports of a radio, the method comprising:
receiving an RF signal via each of the primary ports of the RF circuit; and
providing, by the RF circuit, different frequency response characteristics to the RF signal that is received via the primary ports, respectively, of the RF circuit,
wherein the different frequency response characteristics are provided by frequency-selective RF transmission paths of the RF circuit that are coupled to the primary ports, respectively, of the RF circuit,
wherein the different frequency response characteristics are provided by:
selecting between a first different-length RF transmission path of the RF circuit and a first equal-length RF transmission path of the RF circuit that are both coupled between a secondary port of the RF circuit and a first of the primary ports of the RF circuit; and
selecting between a second different-length RF transmission path of the RF circuit and a second equal-length RF transmission path of the RF circuit that are both coupled between the secondary port and a second of the primary ports of the RF circuit.
17. The method of claim 16 ,
wherein the RF circuit comprises first and second power dividers that are coupled to two inputs, respectively, of a third power divider of the RF circuit, and
wherein a first RF transmission path that is coupled between the first power divider and the third power divider has a different length from a second RF transmission path that is coupled between the second power divider and the third power divider.