Patent ID: 8175013

Claim:
A radio frequency (RF) switch comprising: a circulator having first to third nodes, which are connected to first to third ports, respectively; and a slot line pattern unit installed in a connection line between the third node of the circulator and the third port so as to carry out signal transmission or interception, wherein the slot line pattern unit includes a switching circuit, which is installed at a predetermined location so as to transmit or intercept a signal by maintaining or short-circuiting a gap of a slot line corresponding to the installed location according to an external switching control signal, and a plurality of slot lines formed in predetermined patterns, the slot line pattern unit further including: a first slot line which is provided at a first end thereof with an open slot so that a signal transition occurs between the first slot line and a transmission line connected to the third node of the circulator; and a loop-shaped slot line pattern unit connected to a second end of the first slot line so that a signal transition occurs between the loop-shaped slot line pattern unit and a transmission line forming the third port at a location of the loop-shaped slot line pattern unit, which is opposite to a location of the loop-shaped slot line pattern unit connected to the first slot line, and the switching circuit comprises first and second switching elements, each of which is installed between both ends of the loop-shaped slot line pattern unit at a connection location between the loop-shaped slot line pattern unit and the first slot line so as to short-circuit gap of a slot line at the corresponding location.