MILLIMETER WAVE EMISSION DEVICE AND MILLIMETER WAVE TRANSMISSION AND RECEPTION DEVICE

To provide a millimeter wave emission device and a millimeter wave transmission and reception device that can adjust a millimeter wave emission region for an object to an appropriate size.SOLUTION: A millimeter wave emission device 1 comprises a transmission antenna 11 that transmits millimeter waves, a first cylinder member 20 having a first opening 21, and a second cylinder member 30 having a second opening 31 smaller than the first opening 21. The first cylinder member 20 has the first opening 21 facing the transmission antenna 11 on one end surface side of the first cylinder member 20 and has a first radio wave absorber absorbing the millimeter waves on an inner surface of the first opening 21. The second cylinder member 30 is arranged on the other end surface side of the first cylinder member 20, includes an opposite surface covering the first opening 21 and facing the transmission antenna 11 surrounding the second opening 31, and a second radio wave absorber absorbing the millimeter waves on an inner surface of the second opening 31 and the opposite surface. The transmission antenna 11 transmits the millimeter waves to the first opening 21.SELECTED DRAWING: Figure 1 【課題】対象物に対するミリ波の照射領域を適正なサイズに調整できるミリ波照射装置およびミリ波送受信装置を提供する。【解決手段】ミリ波照射装置１は、ミリ波を送信する送信アンテナ１１と、第１開口２１を有する第１筒部材２０と、第１開口２１より小さな第２開口３１を有する第２筒部材３０と、を備える。第１筒部材２０は、第１筒部材２０の一端面側において、第１開口２１が送信アンテナ１１と対向し、第１開口２１の内面に、ミリ波を吸収する第１電波吸収体を有する。第２筒部材３０は、第１筒部材２０の他端面側に配置され、第２開口３１の周囲に、第１開口２１を覆い且つ送信アンテナ１１と対向する対向面を含み、第２開口３１の内面と対向面とに、ミリ波を吸収する第２電波吸収体を有する。送信アンテナ１１は、第１開口２１に向けてミリ波を送信する。【選択図】図１