| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high frequency communication apparatus for reducing an interference by an electromagnetic wave from inside and outside its enclosure. <P>SOLUTION: In a transmitter-receiver constituted of: an MMIC acting like an oscillator, an amplifier and a mixer; a circuit board on which the MMIC is mounted and to which the MMIC is connected; an antenna board for constituting an antenna; a base on which the circuit board and the antenna board are mounted and through which a coaxial line or a waveguide is penetrated and supported; and a cover at the side of which projections are periodically provided, the MMIC and the circuit board existing on the side, the pitch, size and shape of the projections differ from each other between a cover part placed at a position opposed to the coaxial line or the waveguide and the other cover part than the position, and the projections are formed by extrusion. <P>COPYRIGHT: (C)2004,JPO |
