The invention is directed to a dose control apparatus. In some embodiments, a method as described herein comprises doping a substrate so as to form a p+layer on one side and an n+layer on an another side, removing at least a portion of the n+layer, and then forming a second n+layer, such that a concentration of the n-dopant in the second n+layer is variable throughout a surface of the substrate. This determination can be made based on reception level information, baseband reception IQ information, correlation information between a diversity-combining received signal and a predetermined information sequence, or the like, which are obtained when the diversity combining information with respect to each antenna is sequentially changed. The motor further has a commutation apparatus for alternatingly switching ON the first semiconductor switch and the second semiconductor switch. the active region of a GaInNAs-based quantum well laser diode with GaNAs-based barrier layers. The pocket section with the container is rotated to a third alignment stage.