Abstract: An electromagnetic-shielding structure includes an electromagnetic-shielding container having an opening, an electromagnetic-shielding cover that is movably attached to the electromagnetic-shielding container between a closing position and an opening position, and a choke structure. The choke structure is disposed so as to be positioned between a circumference of the electromagnetic-shielding container defining the opening and a circumference region of the electromagnetic-shielding cover when the electromagnetic-shielding cover is at the closing position, and includes a plurality of dielectric layers and a plurality of conductive layers that are alternately stacked.

Abstract: According to one embodiment, a movable antenna includes a holder, an antenna radiator element attached to the holder, a first feed element that is attached to the holder and electromagnetically coupled to the antenna radiator element, a base plate in a facing arrangement with the holder, a second feed element on the base plate and configured to face and overlap at least a portion of the first feed element, and a mechanism that moves the holder in a longitudinal direction of the second feed element while maintaining an interval between the first and second feed element permitting energy to be transferred between the first and second feed elements.

Abstract: According to one embodiment, an antenna apparatus includes a ground plate having an opening, a ground layer on a first side of the ground plate, an antenna on the first side of the ground plate and connected to the ground layer, the antenna being disposed around the opening, and a conductive member on the first side of the ground plate to contact an outer perimeter of the opening. The conductive member is electrically connected to the ground layer.