A low loss, compact radio antenna and antenna loading method. Two of the proteins in this family are exclusively or predominantly expressed in the prostate, as well as in prostate cancer, and thus members of this family have been termed \u201cSTEAP\u201d. Protrusions provided to a semiconductor chip mounted sealing sub-board are attached to a package substrate. In the obtained reflection coefficient, a portion thereof in which the reflection coefficient is largely reduced is a peak at which strong absorption of high-frequency power is caused due to the plasma density.