Abstract: Disclosed are a dielectric resonator having simple configuration applicable to a multiple mode with no electrical signal transmission loss, and a method of controlling a resonance state (coupling mode) in the dielectric resonator. The dielectric resonator includes a cylindrical or polygonal external conductor, and a dielectric resonant element arranged at the substantially center of the external conductor. A notched portion is formed at a part of the dielectric resonant element so as to control the resonance state of the dielectric resonator.

Abstract: Provided is a spark plug that includes a center electrode extending in an axial direction, a cylindrical insulator that holds the center electrode, and a cylindrical main metal fitting, which has a ground electrode at a tip portion thereof. The cylindrical main metal fitting includes a tool engagement portion for mounting the spark plug to an engine and a metal fitting-side fitting portion provided at a rear side of the main metal fitting opposite from the tip portion. The metal fitting-side fitting portion holds the insulator in a tightly fitted state in a radial direction.

Abstract: Disclosed are a dielectric resonator having simple configuration applicable to a multiple mode with no electrical signal transmission loss, and a method of controlling a resonance state (coupling mode) in the dielectric resonator. The dielectric resonator includes a cylindrical or polygonal external conductor, and a dielectric resonant element arranged at the substantially center of the external conductor. A notched portion is formed at a part of the dielectric resonant element so as to control the resonance state of the dielectric resonator.

Abstract: A spark plug 100, comprising a center electrode 3 which is extended in an axial direction, a cylindrical insulator 2 which holds the center electrode 3, and a cylindrical main metal fitting 1 which has a ground electrode 10 at a tip end portion and a tool engagement portion 8 for mounting on an engine, wherein the main metal fitting 1 has a part of a rear end side from the tool engagement portion 8 as a metal fitting-side fitting portion 9 and holds the insulator 2 in a tightly fitted state in a radial direction by the metal fitting-side fitting portion 9.

Abstract: A high frequency antenna module having a substrate, a feeding electrode and two dielectric chip antennas being mounted on said substrate. Each of the two dielectric chip antennas having a base end connected to the feeding electrode and a floating end as an open end. A distance between said open ends of the two dielectric chip antennas is shorter than a distance between said base ends of the two dielectric chip antennas.

Abstract: An antenna device comprising: a substrate; a radiation portion including a dielectric block arranged on one principal face of said substrate and a first conductor layer formed in a stereoscopic shape on a surface of said dielectric block; and a grounding conductor including a second conductor layer provided on other principal face of said substrate.

Abstract: A multiple band antenna comprising: a dielectric substrate; and a plurality of antenna elements being formed of each a conductor on a same face of the dielectric substrate and provided in a one-to-one correspondence with frequency bands to operate the frequency bands, wherein each of the antenna elements has an open end as one end and is connected at an opposite end to a feeder line and comprises a narrow part being placed on a side of the open end and formed by line with a narrow wide and a wide part being placed on a side of the feeder line and having a wider width than the narrow wide of the narrow part, the narrow part is turned in order in substantially the same direction as a width direction of the wide part, to form a meander shape, and the antenna elements have the wide parts joined in one piece forming a predetermined angle with each other so as to share a part of the wide parts.

Abstract: A dielectric antenna is provided for a high frequency wireless communication apparatus. The antenna includes a dielectric substrate and a conductive meander line layer formed on the dielectric substrate. A conductive feed line layer, having a greater line width than the width of the meander line layer, is also formed on the dielectric substrate. A conductive taper layer connects the conductive meander line layer to the conductive feed line layer. An edge of the conductive taper layer slants at an angle from an adjacent edge of the conductive feed line layer in a direction toward the conductive meander line layer.

Abstract: An antenna device comprising: a substrate; a radiation portion including a dielectric block arranged on one principal face of said substrate and a first conductor layer formed in a stereoscopic shape on a surface of said dielectric block; and a grounding conductor including a second conductor layer provided on other principal face of said substrate.

Abstract: A multiple band antenna comprising: a dielectric substrate; and a plurality of antenna elements being formed of each a conductor on a same face of the dielectric substrate and provided in a one-to-one correspondence with frequency bands to operate the frequency bands, wherein each of the antenna elements has an open end as one end and is connected at an opposite end to a feeder line and comprises a narrow part being placed on a side of the open end and formed by line with a narrow wide and a wide part being placed on a side of the feeder line and having a wider width than the narrow wide of the narrow part, the narrow part is turned in order in substantially the same direction as a width direction of the wide part, to form a meander shape, and the antenna elements have the wide parts joined in one piece forming a predetermined angle with each other so as to share a part of the wide parts.

Abstract: A multiple band antenna comprising: a dielectric substrate; and a plurality of conductor parts formed on a face of the dielectric substrate and connected to each other, wherein the plurality of conductor parts comprises: a first conductor part extending in a first direction with a repetitive pattern of peaks and valleys of a linear line and arriving at an open end; a second conductor part extending in a second direction substantially opposite to the first direction with a repetitive pattern of peaks and valleys of a linear line and arriving at an open end; and a third conductor part formed of a wide line having a wider width than that of each of the linear lines of the first and second conductor parts and connected to opposite ends of the first and second conductor parts and also connected to a feeder line.

Abstract: A high frequency antenna module having a substrate, a feeding electrode and two dielectric chip antennas being mounted on said substrate. Each of the two dielectric chip antennas having a base end connected to the feeding electrode and a floating end as an open end. A distance between said open ends of the two dielectric chip antennas is shorter than a distance between said base ends of the two dielectric chip antennas.

Abstract: A multiple band antenna comprising: a dielectric substrate; and a plurality of conductor parts formed on a face of the dielectric substrate and connected to each other, wherein the plurality of conductor parts comprises: a first conductor part extending in a first direction with a repetitive pattern of peaks and valleys of a linear line and arriving at an open end; a second conductor part extending in a second direction substantially opposite to the first direction with a repetitive pattern of peaks and valleys of a linear line and arriving at an open end; and a third conductor part formed of a wide line having a wider width than that of each of the linear lines of the first and second conductor parts and connected to opposite ends of the first and second conductor parts and also connected to a feeder line.

Abstract: A multiple band antenna comprising: a dielectric substrate; and a plurality of antenna elements being formed of each a conductor on a same face of the dielectric substrate and provided in a one-to-one correspondence with frequency bands to operate the frequency bands, wherein each of the antenna elements has an open end as one end and is connected at an opposite end to a feeder line and comprises a narrow part being placed on a side of the open end and formed by line with a narrow wide and a wide part being placed on a side of the feeder line and having a wider width than the narrow wide of the narrow part, the narrow part is turned in order in substantially the same direction as a width direction of the wide part, to form a meander shape, and the antenna elements have the wide parts joined in one piece forming a predetermined angle with each other so as to share a part of the wide parts.

Abstract: A dielectric antenna is provided for a high frequency wireless communication apparatus. The antenna includes a dielectric substrate and a conductive meander line layer formed on the dielectric substrate. A conductive feed line layer, having a greater line width than the width of the meander line layer, is also formed on the dielectric substrate. A conductive taper layer connects the conductive meander line layer to the conductive feed line layer. An edge of the conductive taper layer slants at an angle from an adjacent edge of the conductive feed line layer in a direction toward the conductive meander line layer.

Abstract: In the vehicle-lamp lighting-on device, a body case has a connection opening formed in the front end thereof. A lighting-on transformer is disposed within the body case. The transformer includes a core housing with an iron core and a coil bobbin with a secondary coil wound thereon. The connection opening of the body case is shielded at the front end of the lighting-on transformer. A socket for receiving a vehicle discharge lamp includes a high-voltage terminal and low-voltage terminals. When the socket is inserted into the connection opening of the body case, the high-voltage terminal of the socket is connected to the high-voltage side terminal of the lighting-on transformer, and the low-voltage terminals are connected to the low-voltage side terminals. The connection opening of the body case is shielded by the front surface (made of insulating material) of the lighting-on transformer.

Abstract: A socket portion is provided to project from one side surface of a transformer receiving portion to thereby form a body case, and a lighting transformer is received in the transformer receiving portion so that a high voltage side output end of a secondary coil of the lighting transformer is electrically connected to a terminal provided in the socket portion and a primary coil of the lighting transformer is connected to an external electric path directly or through a circuit portion. Accordingly, the transformer receiving portion and the socket portion are integrally formed with each other to thereby form a unit structure.

Abstract: In a high-voltage transformer, an insulating ring is placed on and along the inner surface of the core housing, and gaps are formed between the tips of the flange-like plates of the coil bobbin and the inner side of the insulating ring. With such a construction, the gaps and the insulating ring are provided between the coil bobbin and the inner wall of the core housing, so that the flange-like plates of the coil bobbin do not come in contact with the inner surface of cylindrical wall of the core housing. Therefore, a surface distance of the coil bobbin ranges to a contact surface of the coil bobbin where it comes in contact with the front wall of the core housing. The surface distance is elongated. The voltage drop by the creepage discharge does no occur.

Abstract: In a substrate having built-in capacitor which is incorporated in and united with an insulator, the capacitor has a dielectric layer made of a silicon nitride-based ceramic containing silicon carbide in an amount of from 13 to 30% by weight.