Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Hideaki Nakakubo

Toshio Ishizaki

Toru Yamada

Hiroshi Kushitani

Shoichi Kitazawa

Hiroshi Kagata

Tatsuya Inoue

Naoki Yuda

Tomoya Maekawa

Makoto Fujikawa

Kimio Aizawa

Hiroshi Shigemura

Emiko Kawahara

Atsushi Sasaki

Hiroaki Kosugi

Yuki Satoh

Masaharu Tanaka

Kazuhide Uriu

Toshiaki Nakamura

Takashi Fujino

Hiroshi Takahashi

Yasushi Nagata

Tsutomu Matsumura

Tomoyuki Iwasaki

Youichi Morinaga

Shogo Iizuka

Ikuo Ohta

Michael Hoeft

Tooru Sakuragawa

The present invention relates to a resonator device having a stacked arrangement of laminated layers including a plurality of dielectric layers, and at least one resonator comprising a short-circuit electrode, a first capacitor electrode and a second capacitor electrode. Each electrode comprises at least a portion of a layer of electrically conductive material provided on a surface of one of the dielectric layers. The second capacitor electrode is disposed spaced, in the stacking direction, from the short-circuit electrode and the first capacitor electrode. The short-circuit electrode and the second capacitor electrode are electrically interconnected by a first electrical connection comprising at least one via hole penetrating one or more of the dielectric layers.

Laminated RF device with vertical resonators having stack arrangement of laminated layers including dielectric layers

For example, in a conventional high frequency switch used for a mobile phone and so on, high frequency distortion is caused by a diode which is turned off upon transmission. A high frequency switch includes a switch circuit for switching transmission and reception performed via a transmitting terminal and receiving terminals, said switch circuit having a diode turned off upon transmission, and a low-pass filter for suppressing high frequency distortion caused by the diode upon transmission.

High frequency switch, radio communication apparatus, and high frequency switching method

A radio frequency (RF) switch which is used in an RF unit of a communication apparatus and which has less of an insertion loss during a transmission. A strip line disposed in the RF switch is formed by combining first and second strip lines having different values of characteristic impedance from each other.

RF switch

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

A high frequency switch having a plurality of signal paths for four frequency bands, the high frequency switch, has

High frequency switch and high frequency radio communication apparatus

By using a method for manufacturing a dielectric laminated device, an opening is formed on a first dielectric sheet, a strip line and an input and output line including an input and output electrode are formed by burying electrode materials in said opening, the first dielectric sheet is laminated with the second and third dielectric sheets disposed above and below respectively to form a laminate, a first and second shield electrodes and a ground electrode are formed, an end of the strip line is connected to the ground electrode, the first shield electrode and the second shield electrode are mutually connected through the ground electrode, and the input and output electrode is exposed along the line direction of the strip line. By this constitution of the above dielectric laminated device, the mounting reliability of the dielectric laminated device can be further increased.

Method for manufacturing dielectric laminated device

A multiband high-frequency switch that is mainly used for mobile phones, comprising a strip line formed of the series connection of first and second strip lines. A second transmitting port is connected to the connection point of the strip lines connected in series via a third diode, and a second control port is connected between the second transmitting port and the third diode. In addition, first and second receiving ports are connected to the receiving-side port of the high-frequency switch via a diplexer.

Multiband high-frequency switch

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 including a buried electric conductive member to form a strip line and its method of manufacture

A dielectric filter including a plurality of resonators, and at least one transmissions line provided among said plurality of resonators. A band rejection characteristic is formed around a resonance frequency of said resonator, and a line length of said transmission line is shorter than &frac14; of a wavelength corresponding to the resonance frequency of said resonator.

Dielectric filter, antenna duplexer, and communications appliance

The present matching circuit chip has an integrated shape comprising a first transmission line, a second transmission line and a third transmission line, wherein one end of the first transmission line, one end of the second transmission line and one end of the third transmission line are connected to one another, a first filter connection terminal is connected to the other end of the first transmission line, an antenna terminal is connected to the other end of the second transmission line, and a second filter connection terminal is connected to the other end of the third transmission line, whereby the second transmission line converts the characteristic impedances of the first and third transmission lines so that the impedance matching between the antenna terminal and the first filter connection terminal can be attained, and so that the impedance matching between the antenna terminal and the second filter connection terminal can be attained.

Matching circuit chip, filter with matching circuit, duplexer and cellular phone

A dielectric filter including a plurality of resonators, and at least one transmission line provided among said plurality of resonators. A band rejection characteristic is formed around a resonance frequency of the resonator, and a line length of the transmission line is shorter than &frac14; of a wavelength corresponding to the resonance frequency of the resonator.

Growing community of inventors

Kyoto, Japan

Hideaki Nakakubo