1、DRAFT FOR DEVELOPMENTDD IEC/TS 61994-4-3:2008Piezoelectric and dielectric devices for frequency control and selection Glossary Part 4-3: Materials Materials for dielectric devicesICS 31.140g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g5
2、1g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58DD IEC/TS 61994-4-3:2008This Draft for Development was published under the authority of the Standards Policy and Strategy Committee on 30 May 2008 BSI 2008ISBN 978 0 580 63060 6National forewordThis Draft for De
3、velopment is the UK implementation of IEC/TS 61994-4-3:2008. This publication is not to be regarded as a British Standard.It is being issued in the Draft for Development series of publications and is of a provisional nature. It should be applied on this provisional basis, so that information and exp
4、erience of its practical application can be obtained.Comments arising from the use of this Draft for Development are requested so that UK experience can be reported to the international organization responsible for its conversion to an international standard. A review of this publication will be ini
5、tiated not later than three years after its publication by the international organization so that a decision can be taken on its status. Notification of the start of the review period will be made in an announcement in the appropriate issue of Update Standards.According to the replies received by th
6、e end of the review period, the responsible BSI Committee will decide whether to support the conversion into an international Standard, to extend the life of the Technical Specification or to withdraw it. Comments should be sent to the Secretary of the responsible BSI Technical Committee at British
7、Standards House, 389 Chiswick High Road, London W4 4AL.The UK participation in its preparation was entrusted to Technical Committee EPL/49, Piezoelectric devices for frequency control and selection.A list of organizations represented on this committee can be obtained on request to its secretary.This
8、 publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Amendments/corrigenda issued since publicationDate CommentsIEC/TS 61994-4-3Edition 1.0 2008-02TECHNICAL SPECIFICATIONPiezoelectric and dielectric devices for frequen
9、cy control and selection Glossary Part 4-3: Materials Materials for dielectric devices DD IEC/TS 61994-4-3:2008PIEZOELECTRIC AND DIELECTRIC DEVICES FOR FREQUENCY CONTROL AND SELECTION GLOSSARY Part 4-3: Materials Materials for dielectric devices 1 Scope This part of IEC 61994 specifies the terms and
10、 definitions for materials applied for devices using waveguide type dielectric resonators representing the state-of-the-art, which are intended for use in the standards and documents of IEC TC 49. 2 Normative references The following referenced documents are indispensable for the application of this
11、 document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 61338-1: 2004, Waveguide type dielectric resonators Part 1: Generic specification 3 Terms and definitions For the purposes of
12、 this document, the terms and definitions of IEC 61338-1 apply, notably the following. 3.1 dielectric material material which predominantly exhibit dielectric properties IEC 61338-1 3.2 dielectric resonator material dielectric materials defined to be used for resonator application at high frequency,
13、 i.e. UHF or SHF range. The dielectric material is required to have high relative permittivity, a low loss factor and a minimal temperature coefficient of permittivity IEC 61338-1 3.3 electric constant 0 constant equal to 8,85421012AsV1m1, defined by the permittivity of vacuum IEC 61338-1 3.4 relati
14、ve permittivity r absolute permittivity of a material or medium divided by the electric constant 0 DD IEC/TS 61994-4-3:2008 2 NOTE The complex relative permittivity r is defined as “r j= , )(r Re= , )(“r Im= where is usually called dielectric constant; “ corresponds to the dielectric loss of the mat
15、erial. IEC 61338-1 3.5 absolute permittivity quantity which when multiplied by the electric field strength E is equal to the electric flux density D ED = , r0 = IEC 61338-1 3.6 loss angle phase displacement between the component of the electric flux density and the electric field strength IEC 61338-
16、1 3.7 loss factor tangent of the loss angle /“tan = NOTE The loss factor can be determined by the ratio of the negative part to the real part of the complex relative permittivity. IEC 61338-1 3.8 quality factor of a material 0Q reciprocal of the tangent of the loss angle tan/1“/0=Q NOTE The quality
17、factor of a material is also defined as 2 times the ratio of the stored electromagnetic energy to the energy dissipated in the material per cycle. It is frequency dependent. IEC 61338-1 3.9 temperature coefficient of permittivity TC fractional change of permittivity due to a change in temperature di
18、vided by the change in temperature DD IEC/TS 61994-4-3:2008 3 6refrefref10)(=TTTCT 1 106/K where T is the permittivity at temperature T ; ref is the permittivity at reference temperature refT . IEC 61338-1 3.10 coefficient of linear thermal expansion fractional change of dimension due to a change in
19、 temperature divided by the change in temperature 6refrefref10)(=TTlllT 1106/K where Tl is the dimension at temperature T ; refl is the dimension at reference temperature refT . IEC 61338-1 3.11 dielectric resonator resonator using dielectrics with a high dielectric constant and the structure of whi
20、ch is a dielectric waveguide of finite length NOTE The dielectric resonators in use are always shielded with conductors. IEC 61338-1 3.12 dielectric support element supporting a dielectric resonator. The support is generally used for TE01mode resonators and has a low dielectric constant IEC 61338-1
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