Abstract: An antenna apparatus includes a ground substrate, a feeding point provided on the ground substrate, a first loop antenna of which one end is electrically connected to the feeding point and of which another end is electrically connected to the ground substrate and moreover which operates at a first frequency, and a second loop antenna of which both ends are respectively connected to a first end point and a second end point of the first loop antenna and which operates at a second frequency. A space between the first end point and the second end point forms a gap with a range in which the first loop antenna is capable of resonating at the first frequency.

Abstract: The wireless communication apparatus includes a metal frame which encloses a side surface of a main body portion formed in a plate shape, and a ground plate which is housed in the main body portion. The metal frame includes a monopole antenna which is electrically connected to a feeding point at an intermediate portion of a first frame defined by a first gap and a second gap provided on the metal frame and which resonates with a radio wave at a first frequency defined by the intermediate portion and the second gap, a first conductive portion, and a second conductive portion. A length combining the monopole antenna and the first conductive portion is a length enabling the monopole antenna and the first conductive portion to resonate with a radio wave at the first frequency as a loop antenna.

Abstract: An antenna device includes a substrate ground having a planar surface, a planar radiation element disposed in parallel and opposite to a planar portion of the substrate ground, a power feeding point connected to the planar radiation element, and a ground portion forming a stacked body in which, on a radiation surface side, ground patterns made of a conductive material are stacked from the radiation surface in a radiation direction perpendicular to the radiation surface. The ground pattern in each of layers of the stacked body is formed inwardly of a portion immediately overlying the ground pattern in another layer located on the radiation surface side, non-ground portions in which the conductive material is not disposed being formed in a portion immediately overlying the radiation surface, and the non-ground portions in the individual layers are formed to be gradually enlarged in the radiation direction.

Abstract: A printed circuit board includes a dielectric substrate which is formed in a plate-like shape, ground conductor layers which are respectively provided on a top surface and a back surface of the dielectric substrate, a signal line which is provided on a side surface of the dielectric substrate, and transmits a high frequency signal, and a plurality of connection conductors which are provided in the dielectric substrate, connects the ground conductor layer provided on the top surface and the ground conductor layer provided on the back surface, and are aligned and disposed along the signal line.

Abstract: An antenna device includes a metal layer for forming an antenna element in a predetermined planar shape and a ground arranged on a lower side of the metal layer. The metal layer forms a first metal forming the planar shape, a notch portion formed at the first metal, and cutting out a part of an edge of the planar shape, a second metal being an electromagnetic field coupling element arranged with a predetermined distance spaced from the first metal inside the notch portion, and a feeder line formed outside the planar shape, and to be connected with the second metal via an opening portion of the notch portion. For the second metal, a width at the opening portion is smaller than a maximum width at a portion more inside the notch portion than the opening portion.

Abstract: An antenna device includes a substrate ground having a planar surface, a planar radiation element disposed in parallel and opposite to a planar portion of the substrate ground, a power feeding point connected to the planar radiation element, and a ground portion forming a stacked body in which, on a radiation surface side, ground patterns made of a conductive material are stacked from the radiation surface in a radiation direction perpendicular to the radiation surface. The ground pattern in each of layers of the stacked body is formed inwardly of a portion immediately overlying the ground pattern in another layer located on the radiation surface side, non-ground portions in which the conductive material is not disposed being formed in a portion immediately overlying the radiation surface, and the non-ground portions in the individual layers are formed to be gradually enlarged in the radiation direction.

Abstract: An antenna device includes a first antenna having a length corresponding to a first frequency, and arranged along a ground, a second antenna formed by a slot penetrating metal constituting the first antenna, and having a slot length corresponding to a second frequency higher than the first frequency, a first feeder wire for the first frequency, connected from the ground to the first antenna, a metal element for electromagnetic field coupling, arranged in a non-contact state relative to the second antenna, between the slot and the ground; and a second feeder wire for the second frequency, connected from the ground to the metal element.

Abstract: A wireless terminal cover is attached to a plate-like wireless terminal. The wireless terminal cover includes a bottom part that is in contact with the backside of the attached wireless terminal while covering the backside and is made of a dielectric having a relative dielectric constant of 1 to 10, wall parts that are in contact with the sides of the attached wireless terminal while surrounding the sides and are made of the dielectric, and a plurality of conductive elements placed in line on at least one of the bottom part and the wall part. The conductive elements are formed such that the length of the longest one of lines, each of which connects any two points on the conductive elements, is 0.1 to 0.4 times the effective wavelength of radio waves in the dielectric, the radio waves being used for radio communications by the wireless terminal.

Abstract: The wireless communication apparatus includes a metal frame which encloses a side surface of a main body portion formed in a plate shape, and a ground plate which is housed in the main body portion. The metal frame includes a monopole antenna which is electrically connected to a feeding point at an intermediate portion of a first frame defined by a first gap and a second gap provided on the metal frame and which resonates with a radio wave at a first frequency defined by the intermediate portion and the second gap, a first conductive portion, and a second conductive portion. A length combining the monopole antenna and the first conductive portion is a length enabling the monopole antenna and the first conductive portion to resonate with a radio wave at the first frequency as a loop antenna.

Abstract: An antenna apparatus includes a ground substrate, a feeding point provided on the ground substrate, a first loop antenna of which one end is electrically connected to the feeding point and of which another end is electrically connected to the ground substrate and moreover which operates at a first frequency, and a second loop antenna of which both ends are respectively connected to a first end point and a second end point of the first loop antenna and which operates at a second frequency. A space between the first end point and the second end point forms a gap with a range in which the first loop antenna is capable of resonating at the first frequency.

Abstract: An antenna apparatus includes a ground substrate, a feeding point provided on the ground substrate, a first conductor device of which one end is electrically connected to the feeding point and which has a plate shape being parallel to the ground substrate, a second conductor device which is arranged between the first conductor device and the ground substrate, of which one end is electrically connected to the ground substrate, and which has a plate shape being parallel to the ground substrate and a connecting portion which electrically connects another end of the first conductor device and another end of the second conductor device to each other. A width of the first conductor device is wider than a width of the second conductor device. Lengths of the first conductor device and the second conductor device are ½ of a wavelength of a radio wave for operating the antenna apparatus.

Abstract: A wireless terminal cover is attached to a plate-like wireless terminal. The wireless terminal cover includes a bottom part that is in contact with the backside of the attached wireless terminal while covering the backside and is made of a dielectric having a relative dielectric constant of 1 to 10, wall parts that are in contact with the sides of the attached wireless terminal while surrounding the sides and are made of the dielectric, and a plurality of conductive elements placed in line on at least one of the bottom part and the wall part. The conductive elements are formed such that the length of the longest one of lines, each of which connects any two points on the conductive elements, is 0.1 to 0.4 times the effective wavelength of radio waves in the dielectric, the radio waves being used for radio communications by the wireless terminal.