A multiplexer comprising: a first band pass filter having a first frequency passband and a first port for coupling to a transmitter; a second band pass filter having a second frequency passband and a first port for coupling to the transmitter; a third band pass filter having a third frequency passband that is offset from the second frequency passband, and a first port for coupling to a receiver; a fourth band pass filter having a fourth frequency passband, and a first port for coupling to the receiver; and a switch for coupling an antenna to: a second port of the first band pass filter in a first switch position; both a second port of the second band pass filter and a second port of the third band pass filter in a second switch position; and a second port of the fourth band pass filter in a third switch position characterized in that the first and fourth frequency passbands are in a V-band frequency range of about 57 GHz to about 66 GHz; wherein one of the second frequency passband and the third frequency passband is in a first E-band frequency range of about 71 GHz to about 76 GHz and the respective other of the second frequency passband and the third frequency passband is in a second E-band frequency range of about 81 GHz to about 86 GHz wherein the first port of the first band pass filter and the first port of the second band pass filter form a common port coupled to the transmitter and the first port of the third band pass filter and the first port of the fourth band pass fitter form a common port coupled to the receiver. a first band pass filter having a first frequency passband and a first port for coupling to a transmitter; a second band pass filter having a second frequency passband and a first port for coupling to the transmitter; a third band pass filter having a third frequency passband that is offset from the second frequency passband, and a first port for coupling to a receiver; a fourth band pass filter having a fourth frequency passband, and a first port for coupling to the receiver; and a switch for coupling an antenna to: a second port of the first band pass filter in a first switch position; both a second port of the second band pass filter and a second port of the third band pass filter in a second switch position; and a second port of the fourth band pass filter in a third switch position a second port of the first band pass filter in a first switch position; both a second port of the second band pass filter and a second port of the third band pass filter in a second switch position; and a second port of the fourth band pass filter in a third switch position characterized in that the first and fourth frequency passbands are in a V-band frequency range of about 57 GHz to about 66 GHz; wherein one of the second frequency passband and the third frequency passband is in a first E-band frequency range of about 71 GHz to about 76 GHz and the respective other of the second frequency passband and the third frequency passband is in a second E-band frequency range of about 81 GHz to about 86 GHz wherein the first port of the first band pass filter and the first port of the second band pass filter form a common port coupled to the transmitter and the first port of the third band pass filter and the first port of the fourth band pass fitter form a common port coupled to the receiver.