Compensation circuit, anttenna unit, and mimo system

A compensation circuit configured to compensate signals in amplitude and phase, comprising:

• a phase shifting circuit comprising a plurality of phase shifters coupled in parallel;
• and an attenuation circuit coupled to the phase shifting circuit and comprising a plurality of attenuators coupled in parallel;
• wherein the phase shifting circuit comprises a first power divider, a second power divider, a third power divider, a fourth power divider, a fifth power divider, a sixth power divider, and a first electronic switch, a first power divider input terminal configured to receive signals, a first power divider first output terminal coupled to a second power divider input terminal, a first power divider second output terminal coupled to a third power divider input terminal, a second power divider first output terminal coupled to a first electronic switch first terminal, a second power divider second output terminal coupled to a first electronic switch second terminal, a third power divider first output terminal coupled to a first electronic switch third terminal, a third power divider second output terminal coupled to a first electronic switch fourth terminal, a first electronic switch control terminal coupled to a fourth power divider input terminal, a fourth power divider first output terminal coupled to a fifth power divider input terminal, a fourth power divider second output terminal coupled to a sixth power divider input terminal.

A MIMO system, comprising:

• a first antenna unit comprising a first transmitter, a first receiver, a first circulator, a first compensation circuit, a second compensation circuit, a first antenna, and a first electronic switch;
• and
• a second antenna unit comprising a second transmitter, a second receiver, a second circulator, a third compensation circuit, a fourth compensation circuit, a second antenna, and a second electronic switch;
• wherein the first compensation circuit and the second compensation circuit are configured for suspension of noise in signals received by the first transmitter, the third compensation circuit and the fourth compensation circuit are configured for suspension of noise in signals receives by the second transmitter, the first compensation circuit is configured for suspension of noise in leaked signals from the first circulator, the second compensation circuit is configured for suspension of noise in near field signals received by the first antenna unit, the third compensation circuit is configured for suspension of noise in leaked signals from the second circulator, the fourth compensation circuit is configured for suspension of noise in near field signals received by the second antenna unit;
• and wherein the first antenna unit comprises a first coupler, a second coupler, and a third coupler, a first coupler first terminal coupled to the first transmitter through a first amplifier, a first coupler second terminal coupled to a first circulator first terminal, a first circulator second terminal coupled to the first antenna, a second coupler first terminal coupled to a first circulator third terminal, a second coupler second terminal coupled to the first receiver, a first compensation circuit input terminal coupled to a third coupler second terminal, a first compensation circuit output terminal coupled to a second coupler fourth terminal, a third coupler third terminal coupled to a fourth compensation circuit input terminal, a first electronic switch first terminal coupled to the first transmitter, a first electronic switch second terminal coupled to a first coupler third terminal, a first electronic switch third terminal coupled to the first compensation circuit input terminal.