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: A planar antenna includes: first and second conductors each of which forms a microstrip line in combination with a ground electrode, and which are arranged in parallel with each other on a substrate; a plurality of first resonators disposed between the first conductor and the second conductor which electromagnetically couple the first conductor at one longitudinal end of each of the first resonators to generate electric fields which are in phase with each other; and at least one second resonator disposed between the first conductor and the second conductor which electromagnetically couples the second conductor at one longitudinal end of the at least one second resonator to generate an electric field which is in phase with the electric fields generated by the plurality of first resonators, wherein the at least one second resonator is arranged alternately with the plurality of first resonators.

Abstract: A non-transitory computer-readable storage medium storing an antenna design program that causes a computer to execute a process, the process including acquiring a target characteristic value of a target antenna when a value of a structure parameter is a predetermined value, based on the predetermined value of the structure parameter, the target characteristic value, and a relation, with respect to a reference antenna, between a value of a structure parameter and a characteristic value, estimating the relation with respect to the target antenna, the reference antenna having a same shape feature as the target antenna, an antenna type of the reference antenna being different from the target antenna, determining a value of the structure parameter for the target antenna such that the characteristic value of the target antenna satisfies a demanded specification based on the estimated relation, and outputting the determined value of the structure parameter.

Abstract: An antenna device includes: a ground plate; a first patch, provided on one surface side of the ground plate and including two first power feeding portions provided in a region surrounded by a first contour at positions spaced away from a first position with a first distance, configured to resonate with a first frequency; a second patch, provided between the ground plate and the first patch and including two second power feeding portions provided in a region surrounded by a second contour at positions spaced away from a second position with a second distance and a slit formed in the region, configured to resonate with a second frequency lower than the first frequency; and an inter-patch connection portion configured to electrically couple the first position of the first patch and the second position of the second patch.

Abstract: An antenna device includes a substrate, a first antenna element disposed on a surface of the substrate, a second antenna element disposed on the surface of the substrate, the second antenna element being a linear shape, a length of the second antenna element being shorter than twice a length of a side that determines a lowest operating frequency of the first antenna element, a grounding conductor disposed so as not to overlap with the first antenna element and the second antenna element, a feeder coupled to the first antenna element, a first switch and a second switch disposed at the feeder wire, a first matching element and a second matching element disposed between the feeder wire and the grounding conductor, respectively, a third switch configured to switch connecting states of the first antenna element and the second antenna element.

Abstract: An antenna design method executed by a computer includes creating an antenna model including an antenna which includes a plurality of antenna elements and matching circuits which are respectively connected to the plurality of antenna elements and which comprise a matching element including a parasitic reactance and a loss resistance; obtaining a characteristic of the antenna and a characteristic of the matching element; calculating a characteristic of the created antenna model using the obtained characteristic of the antenna and the characteristic of the matching element; judging whether or not the calculated characteristic of the antenna model satisfies a standard value; and displaying result of the judgment.

Abstract: A planar antenna includes: first and second conductors each of which forms a microstrip line in combination with a ground electrode, and which are arranged in parallel with each other on a substrate; a plurality of first resonators disposed between the first conductor and the second conductor which electromagnetically couple the first conductor at one longitudinal end of each of the first resonators to generate electric fields which are in phase with each other; and at least one second resonator disposed between the first conductor and the second conductor which electromagnetically couples the second conductor at one longitudinal end of the at least one second resonator to generate an electric field which is in phase with the electric fields generated by the plurality of first resonators, wherein the at least one second resonator is arranged alternately with the plurality of first resonators.

Abstract: An antenna device includes: a first antenna element configured to radiate first radio waves having a first plane of polarization; and a second antenna element configured to radiate second radio waves having a second plane of polarization orthogonal to the first plane of polarization, wherein ends of the first antenna element and the second antenna element located at mutually approaching sides are disposed in a positional relationship, and a phase deviation caused by an electromagnetic coupling based on the positional relationship is compensated and an electrical power is fed to the first antenna element and the second antenna element with a phase difference that causes a composite wave of the first radio waves and the second radio waves to form a circularly polarized wave.

Abstract: There is provided an antenna device that includes a substrate, a slot provided in the substrate so that the slot includes a cut opening that is close to an edge of the substrate and the slot includes a crooked portion, a conductor section configured to include a slit in an area of the substrate, the area being sandwiched by the slot in the crooked portion, and an antenna that is placed close to the conductor section and is side by side with a surface of the substrate.

Abstract: An antenna designing method, performed by a computer, includes: inputting a first antenna characteristic of an antenna; creating an antenna model that includes the antenna and a matching circuit which is connected to the antenna and is formed by a matching element including parasitic reactance and loss resistance; calculating a second antenna characteristic of the created antenna model by using the first antenna characteristic; determining whether or not the calculated second antenna characteristic satisfies a desired standard value; and displaying a determined result.

Abstract: An antenna device includes: a ground plate; a first patch, provided on one surface side of the ground plate and including two first power feeding portions provided in a region surrounded by a first contour at positions spaced away from a first position with a first distance, configured to resonate with a first frequency; a second patch, provided between the ground plate and the first patch and including two second power feeding portions provided in a region surrounded by a second contour at positions spaced away from a second position with a second distance and a slit formed in the region, configured to resonate with a second frequency lower than the first frequency; and an inter-patch connection portion configured to electrically couple the first position of the first patch and the second position of the second patch.

Abstract: An antenna apparatus including: a first and second antenna elements which transmit or receive radio signal; a ground pattern; and a wiring pattern which is provided on a line segment connecting the first and second antenna elements, and directly connected to the ground pattern, wherein a circumventing path is formed by the wiring pattern and a part of the ground pattern.

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 device includes a feed element being of a length that allows resonance in a specified frequency band, a distributed constant feed line grounded at one end and coupled at another end to the feed element to form a feeding point, a reactive element grounded at one end and coupled at another end to a position a specified distance from the feeding point of the feed line, a first switch disposed between the feed line and the reactive element and used to select whether the feed line and the reactive element are coupled or uncoupled, a parasitic element disposed adjacent to the feed element and being of a length that allows resonance in a frequency band different from the frequency band in which the feed element resonates, and a second switch used to select whether the parasitic element is grounded.

Abstract: An antenna device includes a substrate, a first antenna element disposed on a surface of the substrate, a second antenna element disposed on the surface of the substrate, the second antenna element being a linear shape, a length of the second antenna element being shorter than twice a length of a side that determines a lowest operating frequency of the first antenna element, a grounding conductor disposed so as not to overlap with the first antenna element and the second antenna element, a feeder coupled to the first antenna element, a first switch and a second switch disposed at the feeder wire, a first matching element and a second matching element disposed between the feeder wire and the grounding conductor, respectively, a third switch configured to switch connecting states of the first antenna element and the second antenna element.

Abstract: An antenna design method executed by a computer includes creating an antenna model including an antenna which includes a plurality of antenna elements and matching circuits which are respectively connected to the plurality of antenna elements and which comprise a matching element including a parasitic reactance and a loss resistance; obtaining a characteristic of the antenna and a characteristic of the matching element; calculating a characteristic of the created antenna model using the obtained characteristic of the antenna and the characteristic of the matching element; judging whether or not the calculated characteristic of the antenna model satisfies a standard value; and displaying result of the judgment.

Abstract: A tag patch antenna includes: a slit formed in the vicinity of an edge of an antenna pattern along a part of the edge; and a feeding point to which a tag LSI is connected and which is formed by cutting an intermediate portion of the part of the edge separated by the slit from a body of the antenna pattern by a width of the slit.

Abstract: A metal pipe includes a slot having a predetermined length in a longitudinal direction of the metal pipe and a wireless tag that is placed inside the metal pipe and includes a power feeding unit to feed electric power to the slot and an IC chip connected to the power feeding unit, thereby functioning as an antenna of the wireless tag. The metal pipe is thus managed by the wireless tag.

Abstract: A metal-resistant radio frequency tag that has a broader band pass band (frequency versus communication range) characteristic compared to conventional techniques is achieved. For this purpose, the radio frequency tag according to the present invention includes a first resonator pattern, the first resonator pattern including a chip connecting section to which a chip is to be connected, and an inductance section that is capable of adjusting an impedance matching with the chip; and a second resonator pattern that is fed through electromagnetic induction coupling via the inductance section.

Abstract: An antenna includes a first arm whose one end is connected to a feeding unit, a second arm whose one end is connected to the first arm at a position that is away from the one end of the first arm and whose other end is connected to ground, and a variable impedance unit whose impedance is variable, provided between the ground and the other end of the first arm.