Device for decoupling antennas in compact antenna array and antenna array with the device

A device for decoupling a plurality of antennas in a compact antenna array, comprising:

• a plurality of resonators, each of which is coupled with a respective port connected with each of the plurality antennas,
• wherein coupling coefficients in the device are adjusted to satisfy with a constraint that isolation coefficients in a whole network composed of a first multi-port network consisting of the compact antenna array and a second multi-port network consisting of the plurality of resonators in parallel approach zero as well as reflection coefficients of each port of the whole network are minimized.

An antenna array comprising a plurality of antennas and a decoupling device comprising a plurality of resonators, wherein each of the plurality resonators is coupled with a respective port connected with each of the plurality antennas, wherein coupling coefficients in the device are adjusted to satisfy with a constraint that isolation coefficients in a whole network composed of a first multi-port network consisting of the compact antenna array and a second multi-port network consisting of the plurality of resonators in parallel approach zero as well as reflection coefficients of each port of the whole network are minimized.

A method for decoupling two antennas in a compact antenna array, comprising:

• coupling a first resonator with a source connected with a first antenna of the two antennas;
• coupling a second resonator with the first resonator and a load connected with a second antenna of the two antennas, and
• adjusting a first coupling between the source and the first resonator, a second coupling between the first and second resonators, and a third coupling between the second resonator and the load under a constraint that an isolation coefficient in a whole network composed of a first two-port network consisting of the two antennas and a second two-port network consisting of the first and second resonators in parallel approach zero as well as reflection coefficients of each port of the whole network are minimized.