A circulator with at least three ports (p1, p2, p3), an input port for receiving a radiofrequency signal to be sent to a port intended to be connected to a transmission/reception antenna, an output port able to be connected to a receiving device or a charge, characterized in that it comprises a first and second microelectromechanical identical switches of the series type (MEMS1, MEMS2) formed on a same basic substrate covered with a passivation layer each having: - a moving metal membrane (m) forming a bridge above a switching zone between a first signal line (LS-IN) and a second signal line (LS-OUT) insulated from the first line, the first and second signal lines arranged in the extension of one another, said membrane (m) comprising at least one layer of a metal material selected from among Al, Au or Cu, - a voltage control electrode made on the passivation layer, in said switching zone, and comprising two electrically insulated parts, - a dielectric material with a high relative permittivity above about one hundred, and not varying with the frequency, arranged in direct contact above said control electrode, and having a shape such that along the direction of the two signal lines, said control electrode is wider on two sides, and along the orthogonal direction, the dielectric material overflows two sides of said control electrode, and comes into contact on said passivation layer, and - the first microswitch is arranged to allow the transmission of a radiofrequency or hyperfrequency signal from said input port corresponding to the first signal line of the first microswitch toward the port intended to be connected to an antenna, corresponding to the second signal line of the first microswitch, - the second microswitch is arranged to allow the transmission of a signal between the port intended to be connected to an antenna, corresponding to the first signal line of the second microswitch, toward said output port corresponding to the second signal line of the second microswitch, and in that it comprises an impedance adaptation circuit (ADAPT) connected on said port intended to be connected to an antenna, said adaptation circuit having a virtual obstacle function to the transmission or reflection of a signal from said port toward the input port. - a moving metal membrane (m) forming a bridge above a switching zone between a first signal line (LS-IN) and a second signal line (LS-OUT) insulated from the first line, the first and second signal lines arranged in the extension of one another, said membrane (m) comprising at least one layer of a metal material selected from among Al, Au or Cu, - a voltage control electrode made on the passivation layer, in said switching zone, and comprising two electrically insulated parts, - a dielectric material with a high relative permittivity above about one hundred, and not varying with the frequency, arranged in direct contact above said control electrode, and having a shape such that along the direction of the two signal lines, said control electrode is wider on two sides, and along the orthogonal direction, the dielectric material overflows two sides of said control electrode, and comes into contact on said passivation layer, and - the first microswitch is arranged to allow the transmission of a radiofrequency or hyperfrequency signal from said input port corresponding to the first signal line of the first microswitch toward the port intended to be connected to an antenna, corresponding to the second signal line of the first microswitch, - the second microswitch is arranged to allow the transmission of a signal between the port intended to be connected to an antenna, corresponding to the first signal line of the second microswitch, toward said output port corresponding to the second signal line of the second microswitch,