Patent ID: 7146131
Filing Date: 2006-12-05
Classification: H04B,Y02D

Abstract:
1. An antenna apparatus of a relay system, the relay system including a link antenna apparatus transmitting and receiving electric signals to and from a base station, a coverage antenna apparatus transmitting and receiving electric signals to and from subscriber terminals, and a repeater connected between the link antenna apparatus and the coverage antenna apparatus to bidirectionally amplify electric signals therebetween, the antenna apparatus being one of the link antenna apparatus and the coverage antenna apparatus, the antenna apparatus comprising: at least one radiator; and a power feeder controlling electric field intensity and phases of signals transmitted from or received by the radiator, thereby offsetting beam patterns having an influence on antenna isolation of the antenna apparatus, wherein the power feeder comprises at least one attenuator and at least one phase shifter, the radiator, the attenuator and the phase shifter being serially connected with each other, and wherein the repeater comprises a transmission repeater comprising a first duplexer, a low noise amplifier, a first attenuator, a first driving amplifier and a second duplexer which are serially connected with each other, and a reception repeater comprising a third duplexer, a second driving amplifier, a second attenuator, a high power amplifier and a fourth duplexer which are serially connected with each other.