Tdk Corporation

Seisuke Mochizuka

Michiyuki Nakazawa

Masaki Takahashi

Kenji Inoue

Takuya Sato

An electronic component includes a first and second inductor forming sections integrated with a stack, and a connection conductor layer connecting the first and second inductor forming sections inside the stack. In the first inductor forming section, two first through hole lines are connected to a wide portion of an inductor conductor layer, and two second through hole lines are connected to a narrow portion of the inductor conductor layer. In the second inductor forming section, two first through hole lines are connected to a wide portion of an inductor conductor layer, and two second through hole lines are connected to a narrow portion of the inductor conductor layer.

Multilayer electronic component

Disclosed is a surface acoustic wave filter comprising two or more IDTs arranged in a propagation direction of the surface acoustic wave, wherein said two or more IDTs include at least one pair of IDTs arranged adjacent to each other in order to be acoustically coupled to each other, and have different numbers of paired electrode fingers, and a pitch between each neighboring two of almost all of the electrode fingers included in one of the pair of IDTs which has the smaller number of paired electrode fingers is made different from one to another in order that the IDTs should include no primary pitch area.

Longitudinally coupled resonator-type surface acoustic wave filter

A SAW filter comprises an IDT disposed on a piezo-electric substrate, wherein the IDT includes comb-shaped electrodes having a plurality of interdigital electrodes arranged in a propagation direction of surface acoustic waves and bus bars for connecting these interdigital electrodes, arranged in opposition, and the interdigital electrodes are crossed with one another. The IDT comprises one or more branch electrodes branched from the interdigital electrode and positioned in a non-overlap zone between an overlap zone at which the interdigital electrodes overlap and the bus bar, and the branch electrode includes a branch electrode body extending in a direction substantially orthogonal to the propagation direction of surface acoustic wave. The SAW filter can be applied to any of a longitudinally coupled multi-mode filter, a ladder type filter, a resonator, a filter having a resonator connected in series to a longitudinally coupled multi-mode filter, and the like. A SAW filter and a SAW resonator highly resistant to damages to the electrodes with high Q and low insertion loss can be provided.

Surface acoustic wave filter and resonator utilizing a branch electrode with an electrically opened end

A surface acoustic wave apparatus includes an input terminal, an output terminal, a plurality of acoustically coupled interdigital transducers (IDT), and a phase rotating element (line or inductor) connected in parallel with one or more IDT's. The acoustically coupled IDT's are connected in series between the input and output terminals. Alternatively, the acoustically coupled IDT's may include a series IDT to which the phase rotating element is connected and which is connected in series between the input and output terminals, and a branch IDT acoustically coupled to the series IDT, and disposed on a transmission path which branches from a transmission path between the input and output terminals to a reference potential. Among the plurality of IDT's, &#x3bb;a&#x2267;&#x3bb;b is established, where &#x3bb;a represents an electrode finger pitch of the IDT to which the phase rotating element is connected, and &#x3bb;b represents an electrode finger pitch of the IDT to which no phase rotating element is connected.

Surface acoustic wave apparatus

A surface acoustic wave device is provided with an input signal electrodeand an output signal electrodeto and from which an electric signal is inputted or outputted; a first surface acoustic wave resonatorincluding an input terminalconnected to the input signal electrodeand having a plurality of comb electrodes, an output terminalconnected to the output signal electrodeand having a plurality of comb electrodes, a common terminalwhich has a plurality of comb electrodes and which forms interdigital transducers A and B together with the comb electrodes of the input terminaland the comb electrodes of the output terminaland a second surface acoustic wave resonatorconnected between the common terminalof the first surface acoustic wave resonatorand a pair of grounding terminals

Surface acoustic wave device and branching filter

A surface acoustic wave device is provided with an input signal electrodeand an output signal electrodeto and from which an electric signal is inputted or outputted; a first surface acoustic wave resonatorincluding an input terminalconnected to the input signal electrodeand having a plurality of comb electrodes, an output terminalconnected to the output signal electrodeand having a plurality of comb electrodes, a common terminalwhich has a plurality of comb electrodes and which forms interdigital transducers A and B together with the comb electrodes of the input terminaland the comb electrodes of the output terminal; and a second surface acoustic wave resonatorconnected between the common terminalof the first surface acoustic wave resonatorand a pair of grounding terminals

Growing community of inventors

Tokyo, Japan

Seisuke Mochizuka