Murata Manufacturing Co., Ltd.

Keiichi Hirose

Kengo Onaka

Hirotsugu Mori

Yutaka Sasaki

Toshiro Hiratsuka

Yoshiki Yamada

Kuniaki Yosui

Takahiro Baba

Hitoshi Tada

Yasuo Yamada

Tomohiro Nagai

Tomiya Sonoda

Shigeyuki Mikami

Yoshinori Taguchi

Kiyoshi Kanagawa

Muneyoshi Yamamoto

A distributed constant filter includes a resonator that is not grounded and a first ground electrode. The first ground electrode faces the resonator in a first direction (Z). The resonator is a distributed constant line resonator. The resonator includes a plurality of distributed constant lines and a via conductor. The plurality of distributed constant lines are arranged in layers in the first direction (Z). The via conductor extends in the first direction (Z). Each of the plurality of distributed constant lines is connected to the via conductor only at one end portion of both end portions of the distributed constant line.

Distributed constant filter, distributed constant line resonator, and multiplexer

An antenna module includes a multilayer substrate having a first main surface and a second main surface opposing to each other, a patch antenna formed on a side of the first main surface of the multilayer substrate and configured with a radiation electrode and a ground electrode, an RFIC formed on a side of the second main surface of the multilayer substrate, a first filter, and a second filter different from the first filter, wherein the patch antenna has a first feed point and a second feed point provided at different positions in the radiation electrode, the first feed point is electrically connected to the RFIC via the first filter, the second feed point is electrically connected to the RFIC via the second filter, and the first filter and the second filter are formed in the multilayer substrate.

Antenna module and communication device

A transmission line includes connecting portion connected to the outside and a main body connected to the connecting portion. The connecting portion includes a terminal electrode connected to an external electrode, a signal conductor, and a ground conductor. The main body includes the signal conductor and the ground conductor. The connecting portion includes a first region including the terminal electrode, a second region adjacent to the first region along a signal transmission path, and a third region located between the second region and the main body. Impedance matching at the at least one of the connecting portions is achieved by the first region, the second region, and the third region.

Transmission line and mounting structure thereof

Electrodes () and () are formed on the front face (A) and the rear face (B) of a dielectric substrate (). Fan-shaped apertures (A) and (B) forming a resonator () are formed in the electrodes () and () such that the fan-shaped aperture (A) opposes the fan-shaped aperture (B). Accordingly, two parameters, that is, the radius and the central angle, of the fan-shaped apertures (A) and (B) can be used to set the resonant frequency of the resonator (), thus improving the flexibility in design of the resonator ().

Dielectric resonator device, dielectric filter, duplexer, and high-frequency communication apparatus

A band-pass filter includes electrodes formed on both upper and lower surfaces of a dielectric plate, and a plurality of non-electrode portions on the upper and lower surfaces of the dielectric plate so that the non-electrode portions face each other across the dielectric plate to form resonators in regions confined by the non-electrode portions on the dielectric plate. The resonators other than at least input- and output-stage resonators are n&lgr;2 resonators, where &lgr; denotes one wavelength and n is an integer more than one. The first- and second-stage resonators, and the third- and fourth-stage resonators are magnetically (inductively) coupled, and the second- and third-stage resonators are capacitively or inductively coupled. The band-pass filter therefore provides satisfactory attenuation characteristic from the pass band to the stop band, and can also be compact and lightweight.

Band-pass filter and communication apparatus

Growing community of inventors

Sagamihara, Japan

Keiichi Hirose