Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Toru Sakuragawa

Yuki Satoh

Kozo Murakami

Ryoichi Takayama

Ryouichi Takayama

Hiroyuki Nakamura

Kazunori Nishimura

Mitsuhiro Furukawa

Naoki Yuda

Shunichi Seki

Tetsuo Kawasaki

Katsuya Fujii

Hiroyuki Handa

Hidekazu Nakanishi

Koji Nomura

Yuta Moriura

Yohei Morishita

Toru Okino

Yoshitaka Nakamura

Ichiro Kameyama

Satoshi Morishita

Hiroshi Fujinaka

Yasufumi Kawai

Tetsuro Shimamura

Kimio Aizawa

Hiroyuki Hagino

Ikuo Ota

Hideki Nanba

Yuki Sato

Kazushi Nishida

Yasuhiko Yokota

Koji Seo

Hiroshi Kushanti

Yuji Murashima

A travel sickness estimation system includes an estimation unit and an output unit. The estimation unit is configured to perform estimation processing of estimating, based on person information indicating conditions of a person who is on board a moving vehicle, whether or not the person is in circumstances that would cause travel sickness for him or her. The output unit is configured to output a result of the estimation processing performed by the estimation unit.

Travel sickness estimation system, moving vehicle, travel sickness estimation method, and travel sickness estimation program

A SAW resonator includes an IDT electrode formed on a piezoelectric substrate and reflector electrodes disposed on both sides of the IDT electrode. The IDT electrode includes first finger-electrodes, second finger-electrodes and strip-line electrodes. The first and the second finger-electrodes do not overlap with each other but are acoustically coupled together by the strip-line electrodes. This acoustic coupling by the strip-line electrodes eliminates the need for a common bus-bar electrode, so that the loss caused by the resistance of the common bus-bar electrode can be reduced, and the SAW resonator can be downsized.

Surface acoustic wave (SAW) resonator SAW filter and SAW antenna duplexer using the SAW resonator

A surface acoustic wave filter with little electromagnetic coupling between wires and improved attenuation characteristics is provided. This surface acoustic wave filter comprises: a package having a concavity in the shape of stairs made by laminating dielectrics, a surface acoustic wave element provided on the bottom face of the concavity, a plurality of wires for connecting between a plurality of electrodes provided on the surface of the surface acoustic wave element and a plurality of electrodes provided on one same plane portion of the stairs of the package in correspondence to a plurality of electrodes, and a dummy wire provided between the wires.

Surface acoustic wave filter

Surface acoustic wave (SAW) resonator, SAW filter and SAW antenna duplexer using the SAW resonator

In a surface acoustic wave (SAW) filter including a substrate and an electrode formed on the substrate, the electrode includes a base layer, a first metal layer made of a metal consisting of Al or consisting mainly of Al, and having a given orientation relative to the substrate, a second layer for preventing the first metal layer from migration of Al atoms occurring in vertical to the substrate, and a third layer for adjusting a thickness of the layer. In this SAW filter having an arbitrary layer thickness, the layer hardly causes grain boundary diffusion, and grains of the layer can be made fine for effective resistance to stress. Thus, in this SAW filter, the migration of the Al atoms of the electrode that is associated with the SAW propagation-induced stress imposed on the electrode is inhibited. Accordingly, the filter exhibits excellent resistance against electric power.

Surface acoustic wave filter utilizing a layer for preventing grain boundary diffusion

An antenna duplexer has a power durability to a signal input from an antenna terminal and has stable characteristics. The antenna duplexer includes an input terminal, a transmission filter including a surface acoustic wave (SAW) filter having an input port connected to the input terminal, a phase shifter having an input port connected to an output port of the transmission filter, a reception filter having an input port connected to an output port of the phase shifter, an output terminal connected to the output port of the reception filter, and an antenna terminal connected between the transmission filter and the phase shifter. The transmission filter has a power durability at the output port of the filter, being equal to or larger than a power durability at the input port of the filter.

Antenna duplexer

A small-sized multi-frequency antenna duplexer using surface acoustic wave filters to be applicable to a plurality of frequencies. This antenna duplexer includes two surface acoustic wave (SAW) filters for transmission and reception having passing bands of mutually different frequencies, a phase shift substrate, and a package for accommodating them. The passing band of each antenna duplexer is mutually different from other's passing band. This multi-frequency antenna duplexer includes a plurality of antenna duplexers. In one package, transmitter surface acoustic wave filters, receiver surface acoustic filters, and phase shift substrates are mounted. Thus, the multi-frequency antenna duplexer are reduced in size.

Multi-frequency antenna duplexer

An antenna duplexer capable of optimally decreasing the insertion loss and the voltage standing wave ratio (VSWR) at a center frequency and its vicinity in the pass band in transmitter-band of the device. The output port of transmitter surface-acoustic-wave (SAW) filter ( ) is electrically connected with phase shift circuit ( ), to which receiver SAW filter ( ) is also electrically connected. The transmitter and receiver SAW filters have different pass bands and attenuate the other pass band with each other. Phase shift circuit ( ) shifts the phase of receiver SAW filter ( ) in the transmitter-band. In addition, phase shift circuit ( ) has the characteristic impedance in which the magnitude of the reflection coefficient at the center frequency in the transmitter-band of receiver SAW filter ( ) is to be not less than 0.8 and the phase angle of reflection coefficient at the center frequency in the transmitter-band of receiver SAW filter ( ) takes the range from 0&deg; to 45&deg;.

SAW antenna duplexer having a phase shifter with less than 50 ohm characteristic impedance

A band switching filter includes a resonator circuit having a surface acoustic wave resonator, a switching element and an impedance element. The filter selectively passes or attenuates a signal through one of two pass bands using a single filter. The resonant frequency of the resonator circuit can be shifted to another frequency by selectively connecting the surface acoustic wave resonator to an impedance element using a switching element.

Band switching filter using a surface acoustic wave resonator and an antenna duplexer using the same

Saw filter antenna sharing device using the same, and mobile communication terminal using the same

The present invention relates to a surface acoustic wave (SAW) filter which is used for cellular phones and other mobile communication equipment. The object of the present invention is to realize a SAW filter of which attenuation characteristics and pass characteristics can be set arbitrarily. The SAW filter of the present invention comprises comb-shaped electrodes facing each other disposed on the same piezoelectric substrate, at least two resonators with an input and output terminals, and an equivalent transmission line which is connected between an output terminal of a first resonator and an input terminal of a second resonator. The phase of the transmission line can be adjusted from 5 degrees to 175 degrees arbitrarily at the series resonance frequency of the resonators. This structure realizes a band-stop filter or a band-pass filter whose attenuation characteristics and pass characteristics can be set arbitrarily.

Surface acoustic wave filter utilizing a transmission line with phase characteristics that increase filter out of band attenuation

The present invention relates to a surface acoustic wave filter used in frequency filter of portable telephone and other mobile communication device, and is intended to realize a surface acoustic wave filter capable of obtaining a stable filter characteristic even in the event of input of a large signal. The invention includes resonators (,) to (,) formed on a piezoelectric substrate (,), through-holes (,) provided near the resonators (,) to (,), and a conductive material (,) filling up the through-holes (,), in which the through-holes (,) filled up with the conductive material (,) are electrically grounded. In this constitution, by the through-holes (,) provided near the resonators (,) to (,) and filled up with the conductive material (,), the heat generated in the resonators (,) to (,) when a large signal is applied to the input terminal (,) can be released, so that a stable filter characteristic may be maintained if a large signal is applied.

As the electrode material of a surface acoustic wave device, a laminated body laminating a second metal layer,on a first metal layer,is stacked up in two or more stages, and the first metal layer,is a metal of which coefficient of diffusion to Al is smaller than the coefficient of self diffusion of Al, and the second metal layer,is composed of an Al alloy of three elements or more containing at least one or more metals which forms solid solution with Al at ordinary temperature, and at least one or more metals forming segregation at the grain boundary of Al or an intermetallic compound with Al at ordinary temperature, and therefore the surface acoustic wave device excellent in electric power tolerance, compatible with the conventional pattern forming technology, stable thermally, and capable of preventing increase of insertion loss can be obtained.

Surface acoustic wave device and production method thereof and mobile communication equipment using it

An inexpensive high-frequency circuit device and its electronic component which allows two traces or lines to cross on the same surface without affecting other circuits characteristics. At least one of the lines is a high-frequency signal line. The high-frequency circuit device includes an insulated circuit board having a main surface, a first line disposed on the main surface of the circuit board, a second line disposed on the main surface of the circuit board crossing the first line with an electrically unconnected section at an intersection area of the two lines, a grounding terminal disposed on the main surface of the circuit board, a chip-type electronic component mounted on the main surface of the circuit board which has an insulating body and a line disposed on the insulating body for electrically bridging the electrically unconnected section in the second line, and a grounding layer disposed between the line on the electronic component and the first line which is electrically connected to the grounding terminal. The electronic component mounted on the above circuit board electrically bridges the unconnected section in the second line.

High-frequency circuit board trace crossing and electronic component

Growing community of inventors

Osaka, Japan

Toru Sakuragawa