A communication device comprising: an antenna (150, 750); a front-end switching circuit (780a, 780b, 880) electrically connected with the antenna (150, 750); a transceiver (110, 710, 810); a transmitting amplifier (120, 721a, 721b, 722a, 722b, 821, 822) configured to amplify an output signal from the transceiver (110, 710, 810); a plurality of duplexers or a quadplexer (170, 770a, 770b, 970, 975) electrically connected between the front-end switching circuit (780a, 780b, 880) and the transceiver (110, 710, 810); a plurality of back-end switching circuits including a first back-end switching circuit (791a, 791b, 891) and a second back-end switching circuit (792a, 792b, 892), wherein the first back-end switching circuit (791a, 791b, 891) and the second back-end switching circuit (792a, 792b, 892) are electrically connected between the plurality of duplexers or the quadplexer (170, 770a, 770b, 970, 975) and the transceiver (110, 710, 810); and a plurality of receiving amplifiers including a first receiving amplifier (731a, 731b, 831) and a second receiving amplifier (732a, 732b, 832), the first receiving amplifier (731a, 731b, 831) electrically connected between the first back-end switching circuit (791a, 791b, 891) and the transceiver (110, 710, 810), and the second receiving amplifier (732a, 732b, 832) electrically connected between the second back-end switching circuit (792a, 792b, 892) and the transceiver (110, 710, 810); and wherein, with respect to an input signal received via the antenna (150, 750), a first connection and a second connection between the antenna (150, 750) and the transceiver (110, 710, 810) are simultaneously provided, the first connection to be established using the front-end switching circuit (780a, 780b, 880), a first portion of the plurality of duplexers or the quadplexer (170, 770a, 770b, 970, 975), the first back-end switching circuit (791a, 791b, 891), and the first receiving amplifier (731a, 731b, 831), and the second connection to be established using the front-end switching circuit (780a, 780b, 880), a second portion of the plurality of duplexers or the quadplexer (170, 770a, 770b, 970, 975), the second back-end switching circuit (792a, 792b, 892), and the second receiving amplifier (732a, 732b, 832). an antenna (150, 750); a front-end switching circuit (780a, 780b, 880) electrically connected with the antenna (150, 750); a transceiver (110, 710, 810); a transmitting amplifier (120, 721a, 721b, 722a, 722b, 821, 822) configured to amplify an output signal from the transceiver (110, 710, 810); a plurality of duplexers or a quadplexer (170, 770a, 770b, 970, 975) electrically connected between the front-end switching circuit (780a, 780b, 880) and the transceiver (110, 710, 810); a plurality of back-end switching circuits including a first back-end switching circuit (791a, 791b, 891) and a second back-end switching circuit (792a, 792b, 892), wherein the first back-end switching circuit (791a, 791b, 891) and the second back-end switching circuit (792a, 792b, 892) are electrically connected between the plurality of duplexers or the quadplexer (170, 770a, 770b, 970, 975) and the transceiver (110, 710, 810); and a plurality of receiving amplifiers including a first receiving amplifier (731a, 731b, 831) and a second receiving amplifier (732a, 732b, 832), the first receiving amplifier (731a, 731b, 831) electrically connected between the first back-end switching circuit (791a, 791b, 891) and the transceiver (110, 710, 810), and the second receiving amplifier (732a, 732b, 832) electrically connected between the second back-end switching circuit (792a, 792b, 892) and the transceiver (110, 710, 810); and wherein, with respect to an input signal received via the antenna (150, 750), a first connection and a second connection between the antenna (150, 750) and the transceiver (110, 710, 810) are simultaneously provided, the first connection to be established using the front-end switching circuit (780a, 780b, 880), a first portion of the plurality of duplexers or the quadplexer (170, 770a, 770b, 970, 975), the first back-end switching circuit (791a, 791b, 891), and the first receiving amplifier (731a, 731b, 831), and the second connection to be established using the front-end switching circuit (780a, 780b, 880), a second portion of the plurality of duplexers or the quadplexer (170, 770a, 770b, 970, 975), the second back-end switching circuit (792a, 792b, 892), and the second receiving amplifier (732a, 732b, 832).