An antenna module, comprising: a wireless communication circuit comprising a first port, a second port, a third port, and a fourth port, wherein the wireless communication circuit is configured to: transmit a first signal having a first frequency via the first port; receive a second signal having the first frequency via the second port; transmit a third signal having a second frequency different from the first frequency via the third port; and receive a fourth signal having the second frequency via the fourth port; and a printed circuit board in which a conductive pattern is formed on a first surface and in which the wireless communication circuit is positioned on a second surface facing away from the first surface, wherein the printed circuit board comprises: a first node, a second node, and a third node electrically connected to the conductive pattern; a first electrical path extending between the first port and the first node and having a first length that is an odd multiple of 1/4 of a first wavelength of the first signal; a second electrical path extending between the second port and the first node and having the first length; a third electrical path extending between the third port and the second node and having a second length that is an odd multiple of 1/4 of a second wavelength of the second signal; a fourth electrical path extending between the fourth port and the second node and having the second length; a fifth electrical path extending between the first node and the third node and having a third length, wherein a sum of the first length and the third length is an odd multiple of 1/4 of the second wavelength; a sixth electrical path extending between the second node and the third node and having a fourth length, wherein a sum of the second length and the fourth length is an odd multiple of 1/4 of the first wavelength; and a seventh electrical path electrically connected between the third node and the conductive pattern. a wireless communication circuit comprising a first port, a second port, a third port, and a fourth port, wherein the wireless communication circuit is configured to: transmit a first signal having a first frequency via the first port; receive a second signal having the first frequency via the second port; transmit a third signal having a second frequency different from the first frequency via the third port; and receive a fourth signal having the second frequency via the fourth port; and transmit a first signal having a first frequency via the first port; receive a second signal having the first frequency via the second port; transmit a third signal having a second frequency different from the first frequency via the third port; and receive a fourth signal having the second frequency via the fourth port; and a printed circuit board in which a conductive pattern is formed on a first surface and in which the wireless communication circuit is positioned on a second surface facing away from the first surface, wherein the printed circuit board comprises: a first node, a second node, and a third node electrically connected to the conductive pattern; a first electrical path extending between the first port and the first node and having a first length that is an odd multiple of 1/4 of a first wavelength of the first signal; a second electrical path extending between the second port and the first node and having the first length; a third electrical path extending between the third port and the second node and having a second length that is an odd multiple of 1/4 of a second wavelength of the second signal; a fourth electrical path extending between the fourth port and the second node and having the second length; a fifth electrical path extending between the first node and the third node and having a third length, wherein a sum of the first length and the third length is an odd multiple of 1/4 of the second wavelength; a sixth electrical path extending between the second node and the third node and having a fourth length, wherein a sum of the second length and the fourth length is an odd multiple of 1/4 of the first wavelength; and a seventh electrical path electrically connected between the third node and the conductive pattern. a first node, a second node, and a third node electrically connected to the conductive pattern; a first electrical path extending between the first port and the first node and having a first length that is an odd multiple of 1/4 of a first wavelength of the first signal; a second electrical path extending between the second port and the first node and having the first length; a third electrical path extending between the third port and the second node and having a second length that is an odd multiple of 1/4 of a second wavelength of the second signal; a fourth electrical path extending between the fourth port and the second node and having the second length; a fifth electrical path extending between the first node and the third node and having a third length, wherein a sum of the first length and the third length is an odd multiple of 1/4 of the second wavelength; a sixth electrical path extending between the second node and the third node and having a fourth length, wherein a sum of the second length and the fourth length is an odd multiple of 1/4 of the first wavelength; and a seventh electrical path electrically connected between the third node and the conductive pattern.