A rotational energy harvesting apparatus includes a rotor of magnets and a ring of linear-based kinetic energy harvesters. The test tray allows one fixing unit to fix a plurality of adjacent insert modules to the receiving spaces of the frame, thereby efficiently using the space of the frame and allowing a relatively large number of insert modules to be installed in the same area, in comparison to the conventional test tray. If the electronic representation of the page is not oriented in the predetermined orientation, the electronic representation of the page is rotated so that the electronic representation of the page is in the predetermined orientation. For example, a shorter cyclic prefix length may be selected for each local transmission, and a longer cyclic prefix length may be selected for each wide-area transmission. Each of the plurality of via parts is laid out, offset from a center of the electrode pattern in a second direction intersecting the first direction, and the plurality of electrode patterns has a larger line width at parts where the via parts are connected to, and a distance between the electrode patterns and the adjacent electrode patterns is reduced at the parts.