Murata Manufacturing Co., Ltd.

Seiichi Arai

Kazunari Kawahata

Nobuaki Tanaka

Michio Kadota

Youhei Ishikawa

Hideki Kawamura

Masaki Takeuchi

Hideharu Ieki

Hajime Yamada

Yukio Yoshino

Daisuke Nakamura

Yoshihiko Gotoh

A piezoelectric thin-film resonator includes a supporting substrate. A piezoelectric thin-film is formed on the supporting substrate. A lower electrode and an upper electrode are formed with the piezoelectric thin-film therebetween. The stiffness of at least one of the lower and upper electrodes is higher than that of the piezoelectric thin-film.

Piezoelectric thin-film resonator, piezoelectric filter, and electronic component including the piezoelectric filter

A semiconductor optical device includes a GaAs substrate, a light-emitting/light-receiving layer including a GaN-based compound semiconductor, and a ZnO film formed between the GaAs substrate and the light-emitting/light receiving layer.

Semiconductor optical device and optoelectronic integrated circuit device including a ZnO buffer layer

An antenna includes a cylindrically shaped dielectric resonator placed on a longitudinally extended axis of an elongated dielectric strip disposed on a planar conductor and another planar conductor having an opening covers the dielectric strip with the opening on the dielectric resonator. There may be another dielectric strip placed perpendicularly to the first dielectric strip such that the dielectric resonator is where the lines longitudinally extended from the axes of both dielectric strips will cross.

Antenna with nonradiative dielectric waveguide

A dielectric antenna is provided which is capable of setting the radiation of electromagnetic waves at a desired angle. The dielectric antenna has a nonradiative dielectric guide (an NRD guide) of a construction in which a dielectric strip is sandwiched between a first planar conductor and a second planar conductor. A dielectric resonator is disposed between the first planar conductor and the second planar conductor along the extension line of the dielectric strip, and a plurality of slots are disposed in the second planar conductor above the dielectric resonator and symmetrically with respect to the dielectric resonator.

Plural slot antenna fed with dielectric strip and dielectric resonators

A surface acoustic wave device includes a piezoelectric substrate and a transmitting, a receiving and a reflecting transducer disposed thereon in a row along a predetermined path. The transmitting transducer is responsive to an input signal having a predetermined center frequency for propagating a first surface acoustic wave along the predetermined path. The receiving transducer is located at a location spaced a predetermined distance from the transmitting transducer and is adapted to convert the first acoustic wave to an electrical output signal, but also generates an undesired reflected wave. The reflecting transducer is provided close to one of the other two above-described transducers and is responsive to the first surface acoustic wave to generate a cancellation reflected wave which cancels the undesired reflected wave.

Surface acoustic wave device

A surface acoustic wave device comprises an input and output transducers. A signal is supplied from a signal input circuit to the input transducer and a surface wave corresponding to the input signal is propagated from the input transducer to the output transducer, from which an electrical signal corresponding to the surface wave is withdrawn and is applied to a signal output circuit. An impedance converting circuit is inserted in series between the signal input circuit and the input transducer and/or between the output transducer and the signal output circuit. It has been discovered that this arrangement reduces the electrical triple transit echo.

Growing community of inventors

Takatsuki, Japan

Seiichi Arai