Mobile phone communication function

Perovskites are vital circuit elements for many electronic purposes, from simple capacitors to dielectric resonators used in mobile phones, satellite communications, TV broadcasting and so on. The dielectric properties of bulk perovskites arise from the presence of polarisable constituents in the crystal. These include cation displacements, octahedral tilting and distortions as well as any defects present, such as grain boundaries and various point defects. The relative permittivity is the basic parameter describing a dielectric. In a static electric field this is written as (Table 6.1) but in varying electric fields is replaced by the complex relative permittivity, - is", which is a function of the frequency of the apphed electric field. 

Initially, and from a purely technical point of view, the smart textile concept may be perceived as the result of a convergence between two industries textiles and electronics. The miniaturization of electronics makes it possible for people to carry with them all kinds of devices, qualified as portables , that have functions ranging from leisure (Walkman, MP3, portable television) to communication and information management (mobile phones, personal digital assistants) to health (pacemakers, physiological sensors of parameters). 

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