Radio wave absorber for high-frequency communication device

A radio wave absorber for a high-frequency communication apparatus absorbing unwanted radiated radio waves of a millimeter wave radar to reduce radio wave interference with a semiconductor element inside the high-frequency communication apparatus, the radio wave absorber comprising:

• a side part surrounding the semiconductor element configured to be fixed to a base part provided in the high-frequency communication apparatus;
• and
• a top part closing an open face surrounded by the side part,
• an inner face of the top part being provided with a plurality of protruding parts configured to protrude toward the semiconductor element positioned inside the radio wave absorber, positioned to be spaced apart from the semiconductor element, and periodically arranged, and
• the protruding parts being formed to be tapered toward the semiconductor element and being integrally molded of a synthetic resin, wherein
• each of the protruding parts has a first and second widths, each having a transverse gap and a longitudinal gap, and
• the first and second widths and the transverse gap and the longitudinal gap are arranged in a two-dimensional manner with a transverse period and a longitudinal period.