摘要:
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.
摘要:
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.
摘要:
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. The conductive object group and the coiled conductive object are formed on opposite faces of tile plate-like object from each other. In a perspective view from a normal line direction of the plate-like object, a half or more of the coiled conductive object overlaps with the conductive object group.
摘要:
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).
摘要:
A portable telephone includes a metal substrate, a shield box, a monopole antenna and a feed unit. The surface of the metal substrate includes a conductive metal layer. The shield box covers a radio transmitter-receiver unit provided on the metal substrate to electromagnetically shield the radio transmitter-receiver unit, and has conductivity. The monopole antenna extends in a predetermined direction, and has an electrical length of (&lgr;/2)×N (N is an integer). The feed unit is provided at the metal substrate so as to be apart from the shield box in the extending direction of the monopole antenna. The feed unit includes a matching circuit.
摘要:
An object of the present invention is to provide an antenna feeding circuit, which requires no balance-unbalance converter and has a simplified structure. The object is attained, by an antenna feeding circuit, according to the present invention, in which micro-strips lines are constituted from one or more pair(s) of band conductors (5a, 5b) disposed on the outer surface of the cylindrical body (1) and an inner conductor (6) disposed on the whole of the inner surface of the cylindrical body (1). A 180 degree distributor (2) supplies electric power to the band conductors (5a, 5b) so that the phase difference between the currents in the band conductors (5a, 5b) is 180 degrees. Inutile current induced in the inner surface of the inner conductor can be cancelled out, because the inner conductor 6 is disposed on the whole of the inner surface of the cylindrical body (1).
摘要:
A non-driven first linear element is disposed in the vicinity of an inverted-F second linear antenna element. The driven second linear element is disposed over a conductive plate having a flat shape, in such a manner as to be substantially parallel to the inverted-F antenna. The non-driven element has a short-circuited end of the inverted-F antenna, and has substantially the same resonant frequency as that of the inverted-F antenna.
摘要:
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.
摘要:
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.
摘要:
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.