Patent ID: 8731464

Claim:
An antenna device for preventing oscillation of an amplifier, wherein the amplifier is electrically connected to a first antenna and a second antenna, the antenna device comprising: the amplifier, the amplifier being configured to generate a first amplifier output directed to the second antenna and a second amplifier output directed to the first antenna; a coupling simulator configured to generate: a first coupling simulator output that varies from the first amplifier output based on a pre-determined phase effect value and a pre-determined attenuation effect value, wherein the first coupling simulator output is received by the first antenna; and a second coupling simulator output that varies from the second amplifier output based on the pre-determined phase effect value and the pre-determined attenuation effect value, wherein the second coupling simulator output is received by the second antenna; and a first combining device configured to generate a first amplifier input based on the first coupling simulator output; wherein the pre-determined phase effect value and the pre-determined attenuation effect value are assigned based on system parameters between the first antenna and the second antenna so as to prevent oscillation of the amplifier.