| 摘要 |
The present invention relates to a calibration circuit comprising
- at least a first (11) and a second (12) input/output port, each arranged for being connected to a different transmitter/receiver pair of a MIMO system,
- at least a third (13) and a fourth (14) input/output port, each arranged for being connected to a different antenna,
characterised in that it further comprises
- an attenuator having a first attenuator port (21) and a second attenuator port (22), and
- a first (S3) and a second (S4) non-reciprocal switch, whereby the first switch (S3) is arranged for establishing a connection between the first (11) input/output port and either the third (13) input/output port or the first attenuator port (21), and the second switch (S4) is arranged for establishing a connection between the second (12) input/output port and either the fourth (14) input/output port or the second attenuator port (22). |
