To provide a durable radio wave absorber where the surface resistivity of a resistive film is nearly fixed for a long term, and initially satisfactory radio wave absorption performance can be maintained for a long term.
In the radio wave absorber, the resistive film 3 is provided at one side of a dielectric layer 1, and a radio wave reflector 2 is provided at the opposite surface side of the dielectric layer 1. In this case, the resistive film 3 is sealed from the fresh air containing water. The contact between the resistant film 3 and the water (moisture) in the fresh air is cut off for nearly keeping stable the surface resistivity of the resistive film 3, thus preventing the radio wave absorption performance from deteriorating by a change (increase) in the surface resistivity, and hence maintaining the initially satisfactory radio wave absorption performance for a long term for extensively improving durability and reliability.
TAKAYAMA TAKASHI
ITO HIDEMI
TAKADA TOMONORI
JP2003300716A | 2003-10-21 | |||
JP2003301141A | 2003-10-21 | |||
JP2005086022A | 2005-03-31 | |||
JP2004253796A | 2004-09-09 | |||
JPH11181913A | 1999-07-06 |