| 摘要 |
<p>PROBLEM TO BE SOLVED: To realize formation of an isotropic environment and realize adjustment of delay spread with a simple operation.SOLUTION: Multiple radiowave absorbers 10 each of which has a prescribed area S are provided on an inner surface of a box body 2 at prescribed intervals Lx and Ly. In this state, first delay spread DS1 is measured. Then, the number of radiowave absorbers 10 is changed and then second delay spread DS2 is measured. A regression line 11 showing a relationship between a logarithmically-transformed total value of areas of the radiowave absorbers 10 and the delay spread is obtained on the basis of a measurement result of the first delay spread DS1 and a measurement result of the second delay spread DS2. A total value Sa of the areas of the radiowave absorbers 10 that realizes desired delay spread DSa is specified on the basis of the regression line 11, and the number of radiowave absorbers 10 that realizes the specified total value Sa are provided on the inner surface of the box body 2.</p> |
