Slide 1

Title: Application of Piezoelectric Ceramics in Communication system Dr. & Prof. Chun-Huy Wang Electronical Engineering, Nan-Jeon Institute of Technology Multimedia English Teaching PP.

Slide 2

Electronic Ceramics Ferroelectric Pyroelectric Piezoelectric Dielectric Dielectric Property Piezoelectricity Pyroelectricity Ferroelectricity

Slide 3

What can piezoelectric ceramics do?

Slide 4

Piezoelectricity Mechanical and electrical energy conversion phenomena, discovered by France Scientist Pierre and Jacques Curie brother in 1880. Direct Piezoelectric Effect Mechanical Electrical Converse Piezoelectric Effect

Slide 5

Piezoelectricity

Slide 6

Piezoelectric Ceramics (perovskite) Pervoskite structure, with the chemical formula as ABO 3 e.g. : BaTiO 3 cornal center face center

Slide 7

Piezoelectric Ceramics cornal center face center

Slide 8

Domain and domain boundaries of polycrystalline BaTiO 3 -(Jaffe et al. 1971), (left)domain structure of unpoled ferroelectric ceramics (right) graphical representation

Slide 9

Poling Poling is the final process in the fabrication. Initially, unpoled ceramics have no piezoelectricity because the piezoelectric tensors of the grains are randomly oriented. During the poling process, ferroelectric switching occurs and creates non zero overall piezoelectric tensors.

Slide 10

(3) after poling (1) unpoled (2) during poling

Slide 11

P~E Curve Domain Wall Movement

Slide 12

P~E curve vs Voltage Applied

Slide 13

Communication Applications Piezoelectric ceramics used as the resonator and filter in communication system with frequency lower than 100MHz For frequency higher than 100MHz the Surface Acoustic Wave (SAW) devices is used.

Slide 14

Communication Applications The ceramic filter and resonator are made of high stability piezoelectric ceramics that functions as a mechanical resonator. The frequency is primary adjusted by the size and thickness of the ceramic element. Typical application includes TVs, VCRs, telephones, remote controls and radios.

Slide 15

Communication Applications

Slide 16

Operating Principle and feature of each filter

Slide 17

Ceramics Resonator Resonator is the basic frequency control component, the piezoelectric filter is composed by the piezoelectric resonator.

Slide 18

Ceramics Resonator

Slide 19

Ceramic Filter Monolithic Filter (used for low frequency)

Slide 20

Ceramic Filter

Slide 21

SAW Resonator and Filter SAW : Surface Acoustic Wave In natural world, SAW can create by earthquake. In engineering, SAW can create by piezoelectric effect.

Slide 22

SAW Resonator and Filter

Slide 23

Advantages of SAW High Sensitivity High Accuracy Passive Wireless Digitalized Mass Production Many Application Possibilities

Slide 24

SAW Resonator and Filter Two Port ResonatorOne Port Resonator

Slide 25

SAW Resonator and Filter Applications of SAW Filter GSM Applications of SAW Filter PCS & CDMA

Slide 26

SAW Resonator and Filter Applications of SAW Resonator

Slide 27

Thank you For Listening