Base station signal matching device and relay device including the same

1. A base station signal matching device included in a distributed antenna system, the base station signal matching device comprising at least one processor to implement:

a signal attenuation unit configured to receive a base station signal from a base transceiver system (BTS) and attenuate a power level of the base station signal; and

a signal matching unit configured to receive the attenuated base station signal output from the signal attenuation unit and process the attenuated base station signal to be suitable for signal processing of the distributed antenna system by variably attenuating a power level of the attenuated base station signal,

wherein the signal attenuation unit includes:

a first attenuator configured to attenuate the power level of the base station signal according to a first fixed attenuation ratio; and

a second attenuator disposed after the first attenuator in a signal transmission path and configured to attenuate the power level of the base station signal output from the first attenuator according to a second fixed attenuation ratio.

2. The base station signal matching device of claim 1 , wherein the first-attenuator is manufactured in a coil form using a signal attenuation medium with which an attenuation of a radio frequency (RF) signal is possible.

3. The base station signal matching device of claim 1 , wherein the signal matching unit includes:

a first filter configured to receive the attenuated base station signal output from the signal attenuation unit and pass a first frequency band of the attenuated base station signal; and

a second filter configured to pass a second frequency band of a terminal signal that is sent from a terminal to the BTS via the distributed antenna system.

4. The base station signal matching device of claim 3 , wherein the signal matching unit further includes:

a first variable attenuator configured to attenuate a signal output from the first filter to have a power level suitable for signal processing of the distributed antenna system; and

a second variable attenuator configured to attenuate the terminal signal so that the second frequency band of the terminal signal has a power level suitable for transmission to the BTS.

5. The base station signal matching device of claim 4 , wherein the signal matching unit further includes:

a first power detector configured to monitor a power level of the first frequency band of the base station signal output from the first variable attenuator; and

a second power detector configured to monitor a power level of the second frequency band of the terminal signal output from the second variable attenuator.

6. The base station signal matching device of claim 1 , wherein the distributed antenna system is connected to a plurality of BTSs and a combination of the signal attenuation unit and the signal matching unit is provided for each of a plurality of ports, the plurality of ports respectively corresponding to the plurality of BTSs.

7. The base station signal matching device of claim 6 , further comprising:

a signal coupling unit configured to couple base station signals respectively received from the plurality of BTSs to be output via the signal matching units provided for the ports; and

a signal division unit configured to receive a terminal signal received to the distributed antenna system, the signal division unit inputting the terminal signal to any one of the signal matching units respectively provided for the ports, so that the terminal signal is transmitted to a BTS corresponding to a transmission destination of the terminal signal.