Matsushita Electric Industrial Co., Ltd.

Emiko Kawahara

Toru Yamada

Hideaki Nakakubo

Hiroshi Kushitani

Hiroshi Kagata

Takayuki Takeuchi

Tomoya Maekawa

Hiroshi Shigemura

Tsutomu Matsumura

Masahiro Yamaoka

A laminated dielectric filter is formed by coupling a plurality of resonators to one another by electromagnetic-field coupling. In the laminated dielectric filter, a bypass circuit formed of a series circuit including bypass capacitors and transmission lines is provided in parallel to a magnetic-field bypass coupling between non-adjacent resonators. Thus, capacitance of the bypass capacitors can be regulated without being affected by the magnetic-field bypass coupling between the non-adjacent resonators. As a result, attenuation poles outside a passband can be controlled freely.

Laminated dielectric filter, and antenna duplexer and communication equipment using the same

To provide a laminated band-pass filter comprising at least two band-pass filters without reducing the Q factor of strip line conductors constituting the band-pass filters. A laminated band-pass filter comprises an integrated device formed by laminating and integrating a plurality of dielectric layers together, a plurality of internal grounding conductors formed inside the integrated device, and two band-pass filters sandwiched between two of the plurality of grounding conductors and formed inside the integrated device. One of the band-pass filters has strip line conductors, and the other has strip line conductors. The two band-pass filters are formed in different areas with a boundary between these areas corresponding to a predetermined cross section substantially perpendicular to the grounding conductors.

Laminated filter with a single shield conductor, integrated device, and communication apparatus

A ceramic capacitor includes: a first conductive pattern; a second conductive pattern and a dielectric layer, the first conductive pattern and the second conductive pattern being made of a conductor and provided so as to oppose each other and sandwich the dielectric layer therebetween. The first conductive pattern and the second conductive pattern are different in area from each other, where the second conductive pattern is smaller than the first conductive pattern, and a portion where the first conductive pattern and the second conductive pattern overlap each other forms a capacitance portion. A first extended portion and a second extended portion made of the conductor are formed at both edges of the second conductive pattern so as to extend in mutually opposite directions. With this configuration, the ceramic capacitor with a reduced variation in capacitance value caused by displacement in lamination of green sheets can be provided.

Ceramic capacitor, method for producing the same, and dielectric multilayer device

The present invention comprises baluns which convert balanced line signals and unbalanced line signals mutually, and filters which are electrically connected to the baluns and pass or attenuate the predetermined frequency bands. Electrode layers which compose the electrode patterns of the baluns and the filters , and the dielectric layers are integrally stacked.

Complex high frequency components

Dielectric laminated device and manufacturing method thereof

Growing community of inventors

Sakai, Japan

Emiko Kawahara