Abstract: A planar antenna includes a substrate formed of a dielectric; a distributed constant line formed on a first surface of the substrate, the distributed constant line including a first end to which power is supplied and a second end that is an open end or is grounded; and at least one first resonator arranged on the first surface of the substrate and within a range in which the at least one first resonator is allowed to be electromagnetically coupled to the distributed constant line in a vicinity of any of nodal points of a standing wave of a current that flows through the distributed constant line in response to a radio wave having a certain design wavelength radiated from the distributed constant line or received by the distributed constant line.

Abstract: An antenna apparatus includes a ground plane, a first dielectric layer disposed on the ground plane, a conductive line having a feeding point and an open end or a short end and disposed on the first dielectric layer, a second dielectric layer disposed on the first dielectric layer, a plurality of first conductive elements disposed on the second dielectric layer so that the first conductive elements intersect with the conductive line at a plurality of first positions corresponding to nodes of a standing wave of current flowing through the conductive line, and one or more second conductive elements disposed on the second dielectric layer so that the one or more second conductive elements intersect with the conductive line at second positions corresponding to antinodes of the standing wave between the second end and the first position closest to the second end among the the first positions.

Abstract: The planar inverted-F antenna includes a first substrate made of a dielectric material, a grounding electrode disposed on a first surface of the first substrate; an emitting electrode disposed to be opposite to the grounding electrode so as to sandwich the first substrate, wherein the emitting electrode has an S-shape, and has a short-circuiting point short-circuited to the grounding electrode at an edge portion thereof, and a feed point at which power is fed and which is located away from the short-circuiting point by a distance at which the characteristic impedance of the planar inverted-F antenna for electric waves with a certain design wavelength has a certain value; and a second substrate disposed to cover the entire emitting electrode together with the first substrate and made of a dielectric material.

Abstract: An antenna apparatus includes a ground plane having a rectangular shape in plan view, and four inverted F antenna elements configured to be placed on a surface of the ground plane and to be arranged in a symmetrical manner with respect to the central point of the ground plane in plan view, wherein each of the four inverted F antenna elements includes a short strip extending from one end of a main strip to the short end, a feeding strip, an open strip configured to extend toward the open end from the other end of the main strip to a position placed at a second height lower than the first height, and an end strip configured to extend from a distal end of the open strip to the open end and placed parallel to the ground plane at the second height.

Abstract: The reconfigurable multiband antenna includes the main antenna element connected to a feeding point to receive and transmit a radio signal, the at least one parasitic antenna element being placed on the side of the main antenna element. The at least one parasitic antenna is connected to the main antenna element or they are connected to each other by at least one RF switch. By changing the ON-OFF combination of the RF switches, the connection between the main antenna element and the parasitic antenna element is changed, thereby changing the resonance frequencies of the entire antenna. By this technique, the entire antenna functions as a reconfigurable multiband antenna.

Abstract: An antenna apparatus includes a ground plane, a first dielectric layer disposed on the ground plane, a conductive line having a feeding point and an open end or a short end and disposed on the first dielectric layer, a second dielectric layer disposed on the first dielectric layer, a plurality of first conductive elements disposed on the second dielectric layer so that the first conductive elements intersect with the conductive line at a plurality of first positions corresponding to nodes of a standing wave of current flowing through the conductive line, and one or more second conductive elements disposed on the second dielectric layer so that the one or more second conductive elements intersect with the conductive line at second positions corresponding to antinodes of the standing wave between the second end and the first position closest to the second end among the the first positions.

Abstract: A planar antenna includes a substrate formed of a dielectric; a distributed constant line formed on a first surface of the substrate, the distributed constant line including a first end to which power is supplied and a second end that is an open end or is grounded; and at least one first resonator arranged on the first surface of the substrate and within a range in which the at least one first resonator is allowed to be electromagnetically coupled to the distributed constant line in a vicinity of any of nodal points of a standing wave of a current that flows through the distributed constant line in response to a radio wave having a certain design wavelength radiated from the distributed constant line or received by the distributed constant line.

Abstract: An antenna apparatus includes a ground plane having a rectangular shape in plan view, and four inverted F antenna elements configured to be placed on a surface of the ground plane and to be arranged in a symmetrical manner with respect to the central point of the ground plane in plan view, wherein each of the four inverted F antenna elements includes a short strip extending from one end of a main strip to the short end, a feeding strip, an open strip configured to extend toward the open end from the other end of the main strip to a position placed at a second height lower than the first height, and an end strip configured to extend from a distal end of the open strip to the open end and placed parallel to the ground plane at the second height.

Abstract: An antenna apparatus includes a first dielectric layer, a ground plane, a conductive line, a second dielectric layer, and a first conductive element and a second conductive element configured to be disposed on the second dielectric layer so that the first and the second conductive elements intersect the conductive line at first and second positions corresponding to first and second nodes of a standing wave of current flowing through the conductive line, respectively, wherein the first and the second conductive elements are bent or rounded toward a feeding point with respect to the first and the second positions in plan view, respectively, and wherein a first bent degree, a first rounded degree or a first length of the first conductive element is different from a second bent degree, a second rounded degree or a second length of the second conductive element.

Abstract: There is provided a patch antenna that includes a substrate, a ground electrode placed on the substrate, a first patch configured to be electrically conductive and placed above the ground electrode for transmitting or receiving a first frequency, a second patch configured to be electrically conductive and placed above the first patch for transmitting or receiving a signal of the second frequency, a dielectric member configured to be placed on the ground electrode and support the first patch and the second patch, a first conductor configured to be formed in a cylindrical shape, the first conductor being connected to the first patch and the ground electrode, a second conductor configured to be formed in a cylindrical shape, the second conductor being connected to the second patch and the ground electrode, a first feed line connected to the first patch, and a second feed line connected to the second patch.

Abstract: The planar inverted-F antenna includes a first substrate made of a dielectric material, a grounding electrode disposed on a first surface of the first substrate; an emitting electrode disposed to be opposite to the grounding electrode so as to sandwich the first substrate, wherein the emitting electrode has an S-shape, and has a short-circuiting point short-circuited to the grounding electrode at an edge portion thereof, and a feed point at which power is fed and which is located away from the short-circuiting point by a distance at which the characteristic impedance of the planar inverted-F antenna for electric waves with a certain design wavelength has a certain value; and a second substrate disposed to cover the entire emitting electrode together with the first substrate and made of a dielectric material.

Abstract: A near field antenna includes: a ground electrode arranged on a lower surface of a first dielectric layer; a conductor which is arranged between the first dielectric layer and a second dielectric layer, and forms a microstrip antenna with the ground electrode, one end of the conductor being connected to a power feeding port and the another end of the conductor being an open end; and at least one resonator arranged on an upper surface of the second dielectric layer, within a range in which the resonator is able to electromagnetically couple with the microstrip antenna for any of nodal points of a standing wave of current which flows through the microstrip antenna depending on an electric wave with a certain design wavelength, radiated from the microstrip antenna or received by the microstrip antenna.

Abstract: The reconfigurable multiband antenna includes the main antenna element connected to a feeding point to receive and transmit a radio signal, the at least one parasitic antenna element being placed on the side of the main antenna element. The at least one parasitic antenna is connected to the main antenna element or they are connected to each other by at least one RF switch. By changing the ON-OFF combination of the RF switches, the connection between the main antenna element and the parasitic antenna element is changed, thereby changing the resonance frequencies of the entire antenna. By this technique, the entire antenna functions as a reconfigurable multiband antenna.

Abstract: A wireless tag adapted for mounting inside a hollow electrically conductive pipe, includes: a contact placed in contact with the electrically conductive pipe so as to be electrically connected to the electrically conductive pipe; a lead wire placed inside the electrically conductive pipe along a longitudinal direction of the electrically conductive pipe and spaced a prescribed distance away from an inside wall of the electrically conductive pipe, thereby forming a coaxial line together with the electrically conductive pipe; and a wireless tag circuit, electrically connected at one end to the contact and at the other end to the lead wire, for generating a response signal in response to an interrogation signal transmitted from a reader/writer.

Abstract: Provided is an antenna device, including: a substrate formed using a material having a high dielectric constant; and an antenna conductor accommodated inside the substrate, in which the antenna conductor includes: a first metal strip in a plate shape, in which a flat surface shape thereof has two opposing sides; and a plurality of second metal strips extending, from the two opposing sides of the first metal strip, toward one flat surface side of the first metal strip so as to be orthogonal to a flat surface of the first metal strip.

Abstract: A wireless tag adapted for mounting inside a hollow electrically conductive pipe, includes: a contact placed in contact with the electrically conductive pipe so as to be electrically connected to the electrically conductive pipe; a lead wire placed inside the electrically conductive pipe along a longitudinal direction of the electrically conductive pipe and spaced a prescribed distance away from an inside wall of the electrically conductive pipe, thereby forming a coaxial line together with the electrically conductive pipe; and a wireless tag circuit, electrically connected at one end to the contact and at the other end to the lead wire, for generating a response signal in response to an interrogation signal transmitted from a reader/writer.

Abstract: An antenna device is disclosed. An antenna such as a dipole antenna and a parallel feeder each formed of a conductor pattern are disposed on a dielectric plate. The connector is connected to the antenna through the parallel feeder. The parallel feeder has a length of an integral multiple of a half wavelength and has an even number of bending points between the connecter and the antenna.

Abstract: An antenna device is disclosed. An antenna such as a dipole antenna and a parallel feeder each formed of a conductor pattern are disposed on a dielectric plate. The connector is connected to the antenna through the parallel feeder. The parallel feeder has a length of an integral multiple of a half wavelength and has an even number of bending points between the connecter and the antenna.

Abstract: An antenna device is disclosed. An antenna such as a dipole antenna and a parallel feeder each formed of a conductor pattern are disposed on a dielectric plate. The connector is connected to the antenna through the parallel feeder. The parallel feeder has a length of an integral multiple of a half wavelength and has an even number of bending points between the connector and the antenna.