Abstract: The present invention is characterized by an antenna device including: a circuit board; a circuit pattern formed by a conductor on a surface of the circuit board; and a minute loop antenna mounted on the circuit board and formed in a loop shape by a conductor having two end portions, wherein the circuit pattern includes at least a feeder circuit configured to supply power to the minute loop antenna, and a ground, and the minute loop antenna is mounted on the circuit board such that: the conductor having the two end portions is connected at one end thereof to the feeder circuit and connected at another end thereof to the ground; a loop surface of the conductor having the two end portions is perpendicular to a plane on which the circuit pattern is formed; and a normal line passing through the loop surface does not pass through the circuit pattern.

Abstract: There is provided a conductive hollow tube (3) which is brought into tight contact with the top surface of a grounding conductor (1a) at a position where a first end having an opening plane (4a) with an inner diameter matching a diameter of a hole (2a) formed on the grounding conductor (1) overlaps with the hole (2a), and which is bent so that an opening plane (4b) of a second end faces the top surface direction and that an intermediate portion between the first end and the second end is arranged parallel to the grounding conductor (1), and a conductive liquid supplied from the opening plane (4a) of the first end is passed through the conductive hollow tube (3) and discharged to the outside from the opening plane (4b) of the second end.

Abstract: With regard to a top loaded monopole antenna consisting of a disk 5 and a metal post 6, a partial discharge sensor includes a short-circuit conductor 10 joining the metal post 6 to a covering 7 and a coaxial line composed of a hole 8 and a metal terminal 9. This makes it possible to implement a partial discharge sensor that can suppress the induction of high voltage in the disk 5 and can achieve high sensitivity in a frequency band of a partial discharge to be detected.

Abstract: A partial discharge sensor is configured to have a metal casing 7 disposed outside flange 2a and 2b and a bowtie antenna 8 disposed inside the metal casing 7 in a direction orthogonal to a circumferential direction of the flanges 2a and 2b to thus receive a signal caused by a partial discharge over a wide band with high sensitivity.

Abstract: A partial discharge sensor includes a top-loading monopole antenna including a disc and a post to be installed even in a branch pipe with a small diameter such that a length between the disc and a structure is adjusted to set thereto a frequency band to be detected.

Abstract: A partial discharge sensor evaluation method includes a first frequency characteristic measuring process in which, in a state where a reference antenna 3 for which a frequency characteristic in an effective height is known and a measuring antenna 2 are installed on a flat ground 1 to be separated by a predetermined distance from each other, a transmission characteristic measurer 4 measures a frequency characteristic of a transmission characteristic between the reference antenna 3 and the measuring antenna 2, and a second frequency characteristic measuring process in which, in a state where a measured antenna 9 is installed inside a cylindrical ground 6 buried in a circular opening 5 formed at a position where the reference antenna 3 has been installed, the transmission characteristic measurer 4 measures the frequency characteristic of the transmission characteristic between the measured antenna 9 and the measuring antenna 2.

Abstract: A partial discharge sensor includes: a first ground (1) that constitutes a closed space (3) to surround a high-voltage wire (2); and a cylindrical branch pipe (4) disposed at the first ground (1) to protrude to an outer space to house with a lid (8) a first metal container (6) having at least one hole through which gas can pass, and having a slit (12) formed on the side to the space (3); at one end of a coaxial wire (7) disposed in the container (6), an outer conductor (9) of the coaxial wire (7) is connected to the first metal container (6) at a portion near the center of the slit (12), and an inner conductor (10) of the coaxial wire (7) is connected to the first metal container (6) at an opposite portion to a position where the outer conductor (9) is connected across the slit (12).

Abstract: A first distribution circuit outputs a high frequency signal inputted from an input/output terminal to an input/output terminal and a connecting portion. A second distribution circuit outputs a high frequency signal inputted from an input/output terminal to an input/output terminal and a connecting portion. An end of a transmission line is connected to the connecting portion and the other end of the transmission line is connected to the connecting portion. A first antenna is connected to the input/output terminal, and a second antenna is connected to the input/output terminal.

Abstract: A partial discharge sensor is configured to have a metal casing 7 disposed outside flange 2a and 2b and a bowtie antenna 8 disposed inside the metal casing 7 in a direction orthogonal to a circumferential direction of the flanges 2a and 2b to thus receive a signal caused by a partial discharge over a wide band with high sensitivity.

Abstract: A wireless communication device whose impedance can be matched with an arbitrary load impedance and that can be broadened in operating frequency band even when choosing an input impedance of an IC chip freely is not possible. The wireless communication device includes: a first conductor; a second conductor disposed substantially parallel to the first conductor; a hole formed in the second conductor; a capacitive coupling mechanism disposed adjacent to the hole; and a communication circuit which has at least one of a radio wave transmitting function and a radio wave receiving function. The communication circuit is connected through the capacitive coupling mechanism to two sites on the second conductor that are near borders between the second conductor and the hole.

Abstract: A partial discharge sensor includes a top-loading monopole antenna including a disc and a post to be installed even in a branch pipe with a small diameter such that a length between the disc and a structure is adjusted to set thereto a frequency band to be detected.

Abstract: A radio communication device is obtained which is provided with an RFID tag function which can ensure the mounting area of each antenna as large as possible, and which is sharable with an LF band RFID system or an HF band RFID system and a UHF band RFID system, while having a communication range equivalent to the communication range of each of an LF band an HF band and a UHF band. The device is provided with an integrated circuit (4) having a communication function in a first frequency band, a conductive object (3) connected to one of input and output terminals of the integrated circuit (4), an integrated circuit (5) having a communication function in a second frequency band, and a second conductive object connected between input and output terminals of the integrated circuit (5). The second conductive object is composed of a spiral conductive object (2). The other of the input output terminals of the integrated circuit (4) is connected to a part of the spirally wound conductive object (2).

Abstract: An RFID tag is characterized in that it includes: a dielectric substrate; a ground conductor portion disposed on one main surface of this dielectric substrate; a patch conductor portion disposed on another main surface of the above-mentioned dielectric substrate and forming a slot; electrical connecting portions internally extending from opposing sides of the above-mentioned slot, respectively; and an IC chip placed in the above-mentioned slot and connected to the above-mentioned electrical connecting portions.

Abstract: Provided is a wireless communication device capable of communicating a signal in a first frequency band and a signal in a second frequency band, which is lower in frequency than the first frequency band, including: a plate-like object; a first integrated circuit which has a function of communicating in the first frequency band; a first conductive object which is connected to one of two input/output terminals of the first integrated circuit; a conductive object group constituted of a plurality of second conductive objects at least one of which is connected to another of the two input/output terminals of the first integrated circuit; a second integrated circuit which has a function of communicating in the second frequency band; and a coiled conductive object of which a winding start side is connected to one of two input/output terminals of the second integrated circuit and a winding end side is connected to another of the two input/output terminals of the second integrated circuit.

Abstract: A wireless communication device whose impedance can be matched with an arbitrary load impedance and that can be broadened in operating frequency band even when choosing an input impedance of an IC chip freely is not possible. The wireless communication device includes: a first conductor; a second conductor disposed substantially parallel to the first conductor; a hole formed in the second conductor; a capacitive coupling mechanism disposed adjacent to the hole; and a communication circuit which has at least one of a radio wave transmitting function and a radio wave receiving function. The communication circuit is connected through the capacitive coupling mechanism to two sites on the second conductor that are near borders between the second conductor and the hole.

Abstract: A radio communication device is obtained which is provided with an RFID tag function which can ensure the mounting area of each antenna as large as possible, and which is sharable with an LF band RFID system or an HF band RFID system and a UHF band RFID system, while having a communication range equivalent to the communication range of each of an LF band an HF band and a UHF band. The device is provided with an integrated circuit (4) having a communication function in a first frequency band, a conductive object (3) connected to one of input and output terminals of the integrated circuit (4), an integrated circuit (5) having a communication function in a second frequency band, and a second conductive object connected between input and output terminals of the integrated circuit (5). The second conductive object is composed of a spiral conductive object (2). The other of the input output terminals of the integrated circuit (4) is connected to a part of the spirally wound conductive object (2).

Abstract: A radio tag communication system, when a plurality of RW apparatuses are arranged in such a manner that communication areas of adjacent RW apparatuses overlap one another, makes the polarized waves of the adjacent RW apparatuses orthogonal to each other, and causes the tag to switch the polarization direction with the movement of the tag. This makes it possible to prevent signal interference even when the communication areas are expanded.

Abstract: An RFID tag is characterized in that it includes: a dielectric substrate; a ground conductor portion disposed on one main surface of this dielectric substrate; a patch conductor portion disposed on another main surface of the above-mentioned dielectric substrate and forming a slot; electrical connecting portions internally extending from opposing sides of the above-mentioned slot, respectively; and an IC chip placed in the above-mentioned slot and connected to the above-mentioned electrical connecting portions.

Abstract: A radio tag communication system, when a plurality of RW apparatuses are arranged in such a manner that communication areas of adjacent RW apparatuses overlap one another, makes the polarized waves of the adjacent RW apparatuses orthogonal to each other, and causes the tag to switch the polarization direction with the movement of the tag. This makes it possible to prevent signal interference even when the communication areas are expanded.

Abstract: In a foldable portable telephone, a shield box provided within an upper casing is connected via a flexible cable to an output terminal of a transmitting circuit provided within a lower casing, and the shield box is used as an antenna. Thus, compared to the conventional case where a rod antenna is provided at an upper end of the lower casing, variation in gain dependent on a state of the user's hand holding the portable telephone is lessened.