Saw element and saw device

An SAW element comprising:

• a first wiring portion formed between input and output terminals;
• a plurality of second wiring portions formed between said first wiring portion and a reference potential terminal;
• at least two single unit elements;
• each of said single unit elements including:
• a first SAW resonator which is located in said first wiring portion and which has a predetermined resonant frequency and a predetermined anti-resonant frequency;
• a second SAW resonator which is connected to said second wiring portion of the side of said input terminal of said first SAW resonator and which has an anti-resonant frequency corresponding with said predetermined resonant frequency of said first SAW resonator;
• a third SAW resonator which is connected to said second wiring portion of the side of said output terminal of said first SAW resonator and which has an anti-resonant frequency corresponding with said predetermined resonant frequency of said first SAW resonator;
• a first connection paint for connecting said second SAW resonator of the side of said reference potential terminal and said third SAW resonator of the side of said reference potential terminal with each other;
• and
• a first inductance element which is located between said first connection point and said reference potential terminal,
• wherein said SAW element further comprises a second connection point for connecting the side of said reference potential terminal of said first inductance element in a respective single unit element to each other, and a second inductance element which is located between said second connection point and said reference potential terminal.

An SAW element comprising:

• a first wiring portion formed between input and output terminals;
• a plurality of second wiring portions formed between said first wiring portion and a reference potential terminal;
• and
• at least two single unit elements,
• each of said single unit elements including:
• a first SAW resonator which is located in said first wiring portion and which has a predetermined resonant frequency and a predetermined anti-resonant frequency;
• a second SAW resonator which is connected to said second wiring portion of the side of said input terminal of said first SAW resonator and which has an anti-resonant frequency corresponding with said predetermined resonant frequency of said first SAW resonator;
• a third SAW resonator which is connected to said second wiring portion of the side of said output terminal of said first SAW resonator and which has an anti-resonant frequency corresponding with said predetermined resonant frequency of said first SAW resonator;
• a first connection point for connecting said second SAW resonator of the side of said reference potential terminal and said third SAW resonator of the side of said reference potential terminal with each other;
• and
• a first inductance element which is located between said first connection point and said reference potential terminal,
• wherein each said single unit element provides an substantially identical frequency response comprising a bandpass filter having:
• an attenuating pole fs caused by said resonant frequency or said first SAW resonator;
• an attenuating pole fp caused by said resonant frequency of said second SAW resonator and said third SAW resonator;
• and
• attenuating poles f1 and f2 caused by an electrostatic capacity of said first SAW resonator, an electrostatic capacity of said second SAW resonator, and an inductance of said first inductance element.

An SAW device comprising:

• a mounting substrate on which a predetermined conductor pattern is formed;
• a first SAW element which is mounted on said mounting substrate by a flip-chip mounting, said first SAW element having a piezo-electric substrate and an SAW resonator formed on said piezo-electric substrate, said first SAW element further having input and output terminals which are formed in one of the both sides of a central axis of said piezo-electric substrate and which are electrically connected to said SAW resonator;
• and
• a second SAW element which is mounted on said mounting substrate adjacent to said first SAW element by a flip-chip mounting, said second SAW element having a piezo-electric substrate and an SAW resonator formed on said piezo-electric substrate, said second SAW element further having input and output terminals which are formed in the side remote from said first SAW element and which are electrically connected to said SAW resonator, said input and output terminals being formed in the side remoter from said first SAW element than from said central axis of said piezo-electric substrate.

An SAW device including two SAW elements which are mounted on said SAW device and which have center frequencies different from each other, wherein at least one of the two SAW elements comprises a branching filter comprising a SAW element comprising:

• a first wiring portion formed between input and output terminals;
• a plurality of second wiring portions formed between said first wiring portion and a reference potential terminal;
• and
• at least two single unit elements,
• each of said single unit elements including:
• a first SAW resonator which is located in said first wiring portion and which has a predetermined resonant frequency and a predetermined anti-resonant frequency;
• a second SAW resonator which is connected to said second wiring portion of the side of said input terminal of said first SAW resonator and which has an anti-resonant frequency corresponding with said predetermined resonant frequency of said first SAW resonator;
• a third SAW resonator which is connected to said second wiring portion of the side of said output terminal of said first SAW resonator and which has an anti-resonant frequency corresponding with said predetermined resonant frequency of said first SAW resonator;
• a first connection point for connecting said second SAW resonator of the side of said reference potential terminal and said third SAW resonator of the side of said reference potential terminal with each other;
• and
• a first inductance element which is located between said first connection point and said reference potential terminal,
• wherein respective said predetermined resonant frequency of each of said single unit elements is corresponding with each other and
• the predetermined resonant frequency of the single unit element comprises an electrostatic capacitance of the first SAW resonator, the second SAW resonator, the third SAW resonator, and the first inductance unit.