HIGH FREQUENCY COMMUNICATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a high frequency communication device which exerts the circuit features to the utmost by restricting electromagnetic coupling between high frequency circuit devices. SOLUTION: At a high frequency communication device which restricts a electromagnetic interface between a high frequency circuit device 4a and 4b mounted to a circuit board 6 by a filtering features which are achieved by metal projections 7 made in plural at the ceiling part of a metal cover 3, the size L between the projection 7 and a metal wall 2 and the wavelength λg of a magnetic wave at applied bandwidth are set to form the relation of L<λg/2. By setting the L smaller than λg/2, the space in enclosure of the part of size L works as a cut off waveguide and enables to nullify unnecessary electromagnetic wave coupling between high frequency circuit devices by restricting propagation of spurious electromagnetic wave in the space.