RF structure of user terminal for supporting multi-carrier aggregation and various communication radio access technologies

A terminal, comprising:

• a band-adjustable tunable antenna;
• a diplexer which is connected to the tunable antenna and aggregate and separate subcarriers;
• a first antenna switch which is connected to the diplexer and aggregate and separate low band subcarriers and middle band and high band subcarriers;
• a second antenna switch which is connected to the diplexer and selects middle band and the high band subcarriers;
• a low band subcarrier processing unit which is connected to the first antenna switch and several aggregate and separate subcarriers of a low band;
• a middle band subcarrier processing unit which is connected to the second antenna switch and several aggregate and separate subcarriers of a middle band;
• and
• a high band subcarrier processing unit which is connected to the second antenna switch and several aggregate and separate subcarriers of a high band,
• wherein the low band subcarrier processing unit is connected to a low noise amplifier in order to prevent a loss of reception sensitivity and an increase in noise level generated on a reception path of the diplexer, the first antenna switch, and the low band subcarrier processing unit,
• wherein the low band subcarrier processing unit comprises:
• a low band duplexer which is connected to the first antenna switch and aggregates and separates a transmission and reception of a first low band subcarrier;
• and
• a low band quadplexer which is connected to the first antenna switch, aggregates and separates a second low band subcarrier and a third low band subcarrier, and aggregates and separates transmission and reception, and
• wherein the middle band subcarrier processing unit or the high band subcarrier processing unit is connected to a low noise amplifier in order to prevent a loss of reception sensitivity and an increase in noise level generated on a reception path of the diplexer, the second antenna switch, and the middle band subcarrier processing unit or the high band subcarrier processing unit.