Kyocera Corporation

Shunichi Murakawa

Kazuo Watada

Akinori Sato

Takanori Ikuta

Hiroshi Yoshizaki

Hiroshi Aida

Yumiko Itoh

Katsumi Nakamura

Tetsuzi Hayasaki

Koji Hamada

Yoshihiro Okawa

Tsuyoshi Furuno

Mizuho Ohta

A surface-mount type antenna includes a rectangular-parallelepiped base body made of a dielectric or magnetic material, having a first surface to be placed on a target substrate, second to fifth surfaces that are continuous with the first surface, and a sixth surface located in parallel with the first surface; a ground electrode formed on at least one of the second to fifth surfaces; two radiating electrodes that are continuous with the ground electrode and extend over two or more adjacent surfaces of the second to sixth surfaces; and two feeding electrodes formed on at least one of the second to fifth surfaces so as to be spaced apart circumferentially of the continuum of the second to fifth surfaces to provide the ground electrode in between. The feeding electrode is capacitance-coupled to the radiating electrode for effecting feeding.

Surface-mount type antenna and antenna apparatus employing the same, and wireless communication apparatus

In order to provide a small size antenna where excellent antenna properties can be stably gained, a frequency adjustment is easy and a simple measurement is possible, according to the present invention, a small size antenna formed of a conductor of at least two adjoining surfaces of a base in rectangular parallelepiped form made of dielectric ceramics is characterized in that: a step is made of a flat portion parallel to one surface of the two adjoining surfaces and an inclining portion located between the one surface and the flat portion, in a corner portion of the two surfaces on which the conductor is formed; the width of the flat portion is 0.08 mm or less; and a border portion between the flat portion and the other surface of the two adjoining surfaces is a curve having a curvature radius R of 0.03 mm to 0.2 mm.

Small size antenna, surface mounting type antenna and antenna device as well as radio communication device

An surface-mount type antenna includes a rectangular parallelepiped base body, a feeding terminal formed at one-end-side part of one side surface thereof, and a radiating electrode, to one end of which is connected the feeding terminal, disposed such that its other end is routed from one-end-side part of one side surface, through one-end-side part of one principal surface, to another-end-side part of one principal surface, and extends from the other-end-side part to the one end side part parallelly with a ridge of the base body, and is eventually formed into an open end. An antenna apparatus is constructed by mounting the surface-mount type antenna on a mounting substrate having a feeding electrode and a ground conductor layer with a linear side edge located near the feeding electrode, with the ridge of the base body arranged parallel to the linear side edge of the ground conductor layer.

Surface-mount type antenna and antenna apparatus

The invention provides an antenna apparatus including a driven element formed of a rectangular conductor, and a grounding plate which is arranged in proximity to at least one of side edges of the driven element, with a predetermined interval secured therebetween. This construction requires less mounting space, achieves wide bandwidth and low conductor loss.

Antenna apparatus

A member used within a plasma processing apparatus and exposed to a plasma of a halogen gas such as BClor Clis formed from a sintered body of metals of Group IIIa of Periodic Table such as Y, La, Ce, Nd and Dy, and Al and/or Si, for example, 3YO.5AlO, 2YO.AlO, YO.AlOor disilicate or monosilicate, and in particular, in this sintered body, the content of impurity metals of Group IIa of Periodic Table contained in the sintered body is controlled to be 0.15 wt % or more in total. Specifically, for this member, an yttrium-aluminum-garnet sintered body having a porosity of 3% or less and also having a surface roughness of 1 &#x3bc;m or less in center line average roughness Ra is utilized.

Ceramic material resistant to halogen plasma and member utilizing the same

The surface-mount type antenna includes: a substantially rectangular parallelepiped base body; feeding and ground terminals formed on one side surface of the base body; and a radiating electrode, to one end of which is connected the ground terminal, disposed such that its other end extends from one side surface, through another end side part of one principal surface of the base body, to the one end side part thereof, then turns to the other end side part; and is eventually formed into an open end located near the other end side part. The feeding terminal is disposed near the radiating electrode. The antenna apparatus is constructed by mounting the surface-mount type antenna on the mounting substrate having the feeding electrode, the ground electrode, and the ground conductor layer.

The helical antenna comprises a base body and a helically-configured conductor on a top surface of the base body, wherein base body's thickness a is given as 0.3&lE;a&lE;3 (mm); length b is given as 5&lE;b&lE;20 (mm); and relative dielectric constant &egr;r is given as 3&lE;&egr;r&lE;30, and conductor's winding number x is given as 3&lE;x&lE;16 (turns), and its resonant frequency f and conductor width w satisfy formulae (1): f&equals;Ax&plus;By&plus;C (MHz) and (2): w&equals;Dx&plus;E (mm), where y represents base body width and A through E represent constants determined according to the base body's thickness a, length b, and relative dielectric constant &egr;r.

Helical antenna and communication apparatus

In a surface-mount type antenna, a substantially-rectangular solid base body has a feeding terminal and a ground terminal formed on its one side surface. A radiating electrode has its one end connected to the ground terminal and is disposed helically across the surfaces of base body extending from one side surface to one principal surface. Another end of radiating electrode extends from one principal surface, through another side surface, toward another principal surface, to form a wide-area portion facing the feeding terminal. An antenna apparatus is constructed by mounting the surface-mount type antenna on a mounting substrate having formed thereon a feeding electrode, a ground electrode, and a ground conductor layer, and simultaneously connecting the feeding terminal and the ground terminal to the feeding electrode and the ground electrode, respectively.

It is an object of the invention to provide a meander antenna that is smaller and lighter, in which the resonance frequency easily can be tuned, as well as a method for tuning its resonance frequency. The meander antenna comprises a meandering conductor on the surface of a substrate. The meander antenna is provided with a short-circuit conductor line that forms a short-circuit between two parallel opposing lines into which the conductor is bent, or an open conductor line in which a line short-circuiting the two parallel opposing lines is open. The resonance frequency can be tuned and lowered by cutting open the short-circuit line or increased by short-circuiting the open conductor line.

Meander antenna and method for tuning resonance frequency of the same

Dielectric ceramic composition, method of preparing dielectric ceramic material, and dielectric resonator

A member used within a plasma processing apparatus and exposed to a plasma of a halogen gas such as BCl or Cl is formed from a sintered body of metals of Group IIIa of Periodic Table such as Y, La, Ce, Nd and Dy, and Al and/or Si, for example, 3Y O &middot;5Al O , 2Y O &middot;Al O , Y O &middot;Al O or disilicate or monosilicate, and in particular, in this sintered body, the content of impurity metals of Group IIa of Periodic Table contained in the sintered body is controlled to be 0.15 wt % or more in total. Specifically, for this member, an yttrium-aluminum-garnet sintered body having a porosity of 3% or less and also having a surface roughness of 1 &mgr;m or less in center line average roughness Ra is utilized.

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Kyoto, Japan

Shunichi Murakawa