A board to board contactless interconnect system, comprising: a waveguide having a first waveguide portion and a second waveguide portion; a first circuit board having a transceiver for launching or receiving a microwave signal into or from a cavity extending through the first waveguide portion, the first waveguide portion having a first end securable to the first circuit board with the transceiver and first waveguide portion cavity aligned, and a second end; a first conductive gasket positioned between the first circuit board and the first end of the first waveguide portion, the first conductive gasket having an aperture aligned with the first waveguide portion cavity, the aperture having a cross-sectional shape and dimensions of a cross-section of the first waveguide portion cavity; the second waveguide portion having a first end coupleable to the second end of the first waveguide portion, the second waveguide portion having a second waveguide portion cavity with the same cross-sectional shape and dimensions of the cross-section of the first waveguide portion cavity for receiving or passing the microwave signal, and a second end; a second conductive gasket positioned between the second end of the first waveguide portion and the first end of the second waveguide portion, the second conductive gasket having an aperture aligned with the first waveguide portion cavity and the second waveguide portion cavity, the aperture having the cross-sectional shape and dimensions of the cross-section of the second waveguide portion cavity; a second circuit board having a transceiver for receiving or launching the microwave signal from or into the second waveguide portion cavity, the second end of the second waveguide portion securable to the second circuit board with the transceiver and the second waveguide portion cavity aligned; and a third conductive gasket positioned between the second end of the second waveguide portion and the second circuit board, the third conductive gasket having an aperture aligned with the second waveguide portion cavity, the aperture having the cross-sectional shape and dimensions of the cross-section of the second waveguide portion cavity; wherein the first waveguide portion has a extension received in a corresponding recess in the first end of the second waveguide portion and the second conductive gasket is received in the recess is compressible and prevents microwave energy leakage between the first waveguide portion and the second waveguide portion. a waveguide having a first waveguide portion and a second waveguide portion; a first circuit board having a transceiver for launching or receiving a microwave signal into or from a cavity extending through the first waveguide portion, the first waveguide portion having a first end securable to the first circuit board with the transceiver and first waveguide portion cavity aligned, and a second end; a first conductive gasket positioned between the first circuit board and the first end of the first waveguide portion, the first conductive gasket having an aperture aligned with the first waveguide portion cavity, the aperture having a cross-sectional shape and dimensions of a cross-section of the first waveguide portion cavity; the second waveguide portion having a first end coupleable to the second end of the first waveguide portion, the second waveguide portion having a second waveguide portion cavity with the same cross-sectional shape and dimensions of the cross-section of the first waveguide portion cavity for receiving or passing the microwave signal, and a second end; a second conductive gasket positioned between the second end of the first waveguide portion and the first end of the second waveguide portion, the second conductive gasket having an aperture aligned with the first waveguide portion cavity and the second waveguide portion cavity, the aperture having the cross-sectional shape and dimensions of the cross-section of the second waveguide portion cavity; a second circuit board having a transceiver for receiving or launching the microwave signal from or into the second waveguide portion cavity, the second end of the second waveguide portion securable to the second circuit board with the transceiver and the second waveguide portion cavity aligned; and a third conductive gasket positioned between the second end of the second waveguide portion and the second circuit board, the third conductive gasket having an aperture aligned with the second waveguide portion cavity, the aperture having the cross-sectional shape and dimensions of the cross-section of the second waveguide portion cavity; wherein the first waveguide portion has a extension received in a corresponding recess in the first end of the second waveguide portion and the second conductive gasket is received in the recess is compressible and prevents microwave energy leakage between the first waveguide portion and the second waveguide portion.