Patent ID: 9621132
Date: 2017-04-11
CPC Classifications: H01Q,H03H,H03J,H04B

Claim:
1. An apparatus for tuning a plurality of antennas, the plurality of antennas operating in a given frequency band, the apparatus comprising: n antenna ports electrically connected to the plurality of antennas, n being an integer greater than or equal to three; m user ports, m being an integer greater than or equal to three; first adjustable impedance elements, each being electrically connected to one of the antenna ports and ground; second adjustable impedance elements, each being electrically connected to one of the user ports and another one of the user ports; and windings, each being electrically connected to one of the antenna ports and one of the user ports, wherein the first and second adjustable impedance elements are configured to be electronically adjustable based on variation of impedance matrix presented by the user ports, and wherein the plurality of antennas are configured to be simultaneously tuned.