Surface-acoustic-wave resonator and filter utilizing effective reflecting structure
AssigneeTai-Saw Technology Co., Ltd.
InventorsChih-Chung Hsiao, Bao-De Huang
Life of this patent
Estimating the term…
Abstract
An interdigital transducer for a surface-acoustic-wave resonator includes a conductive grid and a plurality of practical electrodes. The conductive grid includes a bus bar, a plurality of dummy electrodes and a conductive bar. The bus bar has a signal transmission terminal, and is disposed on a first side of the first conductive grid. The plurality of dummy electrodes directly extend from the bus bar. The conductive bar is disposed on a second side of the first conductive grid, and is opposite to the bus bar. Each of the plurality of practical electrodes extends from the conductive bar.
Claims20
A surface-acoustic-wave (SAW) resonator comprising:
- a substrate;
- and
- an interdigital transducer disposed on the substrate, and including:
- a first conductive grid including:
- a first bus bar having a first signal transmission terminal, and disposed on a first side of the first conductive grid;
- a first plurality of dummy electrodes directly extending from the first bus bar;
- a first conductive bar disposed on a second side of the first conductive grid, and being opposite to the first bus bar;
- a first plurality of inner bars disposed between the first bus bar and the first conductive bar;
- and
- a first plurality of conductive connection segments electrically connected to the first bus bar and the first plurality of inner bars, directly extending between the first bus bar and the first plurality of inner bars, and interlaced with the first plurality of dummy electrodes;
- and
- a first plurality of practical electrodes, each of which extends from the first conductive bar, wherein:
- the first plurality of practical electrodes have a periodic electrode distance λ;
- and
- each of the first plurality of dummy electrodes and a nearby one of the first plurality of inner bars have a first gap distance therebetween which ranges from 0.0625λ to 0.5λ.
A surface-acoustic-wave (SAW) resonator, comprising:
- a substrate;
- and
- an interdigital transducer disposed on the substrate, and including:
- a first conductive grid including:
- a first bus bar having a first signal transmission terminal, and disposed on a first side of the first conductive grid;
- a first plurality of dummy electrodes directly extending from the first bus bar;
- a first conductive bar disposed on a second side of the first conductive grid, and being opposite to the first bus bar;
- a first inner bar disposed between the first bus bar and the first conductive bar;
- and
- a first plurality of conductive connection segments electrically connected to the first bus bar and the first inner bar, directly extending between the first bus bar and the first inner bar, and interlaced with the first plurality of dummy electrodes;
- and
- a first plurality of practical electrodes, each of which extends from the first conductive bar, wherein:
- the first plurality of practical electrodes have a periodic electrode distance λ;
- and
- each of the first plurality of dummy electrodes and the first inner bar have a first gap distance therebetween which ranges from 0.0625λ to 0.5λ.
An interdigital transducer for a surface-acoustic-wave (SAW) resonator, the interdigital transducer comprising:
- a first conductive grid including:
- a first bus bar having a first signal transmission terminal, and disposed on a first side of the first conductive grid;
- a first plurality of dummy electrodes directly extending from the first bus bar;
- a first conductive bar disposed on a second side of the first conductive grid, and being opposite to the first bus bar;
- and
- a first plurality of conductive connection segments electrically connected to the first bus bar and the first conductive bar, directly extending between the first bus bar and the first conductive bar, and interlaced with the first plurality of dummy electrodes;
- and
- a first plurality of practical electrodes, each of which extends from the first conductive bar, wherein:
- the first plurality of practical electrodes have a periodic electrode distance λ;
- and
- each of the first plurality of dummy electrodes and the first conductive bar have a first gap distance therebetween which ranges from 0.0625λ to 0.5λ.
Dependencies are inferred from the claim text.