1、Designation:D556814Standard Test Method forMeasuring Relative Complex Permittivity and RelativeMagnetic Permeability of Solid Materials at MicrowaveFrequencies Using Waveguide1This standard is issued under the fixed designation D5568;the number immediately following the designation indicates the yea
2、r oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers a procedure for determiningrelative c
3、omplex permittivity(relative dielectric constant andloss)and relative magnetic permeability of isotropic,reciprocal(non-gyromagnetic)solid materials.If the material isnonmagnetic,it is acceptable to use this procedure to measurepermittivity only.1.2 This measurement method is valid over a frequencyr
4、ange of approximately 100 MHz to over 40 GHz.These limitsare not exact and depend on the size of the specimen,the sizeof rectangular waveguide transmission line used as a specimenholder,and on the applicable frequency range of the networkanalyzer used to make measurements.The size of specimendimensi
5、on is limited by test frequency,intrinsic specimenelectromagnetism properties,and the request of algorithm.Being a non-resonant method,the selection of any number ofdiscrete measurement frequencies in a measurement bandwould be suitable.Use of multiple rectangular waveguidetransmission line sizes ar
6、e required to cover this entire fre-quency range(100 MHz to 40 GHz).This test method can alsobe generally applied to circular waveguide test fixtures.Therectangular waveguide fixture is preferred over coaxial fixtureswhen samples have in-plane anisotropy or are difficult tomanufacture precisely.1.3
7、The values stated in SI units are to be regarded as thestandard.The values given in parentheses are in inch-poundunits and are included for information only.The equationsshown here assume an e+jtharmonic time convention.1.4 This standard does not purport to address all of thesafety concerns,if any,a
8、ssociated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1711 Terminology Relating to Electrical Insulation3.Ter
9、minology3.1 For other definitions used in this test method,refer toTerminology D1711.3.2 Definitions:3.2.1 relative complex permittivity(relative complex dielec-tric constant),r*,nthe proportionality factor that relates theelectric field to the electric flux density,and which depends onintrinsic mat
10、erial properties such as molecular polarizability,charge mobility,and so forth:r*5 r2 jr5DW0EW(1)where:0=the permittivity of free space,D=the electric flux density vector,andE=the electric field vector.3.2.1.1 DiscussionIn common usage the word“relative”is frequently dropped.The real part of complex
11、 relativepermittivity(r)is often referred to as simply relativepermittivity,permittivity,or dielectric constant.The imaginarypart of complex relative permittivity(r)is often referred to asthe loss factor.In anisotropic media,permittivity is describedby a three dimensional tensor.3.2.1.2 DiscussionFo
12、r the purposes of this test method,the media is considered to be isotropic and,therefore,permit-tivity is a single complex number at each frequency.3.2.2 relative complex permeability,r*,nthe proportion-ality factor that relates the magnetic flux density to the1This test method is under the jurisdic
13、tion of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.12 on Electrical Tests.Current edition approved Nov.1,2014.Published November 2014.Originallyapproved in 1994.Last previous edition approved in 2008 as D5568 08.DOI:10.1520
14、/D5568-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this
15、 standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 magnetic field,and which depends on intrinsic material prop-erties such as magnetic moment,domain magnetization,and soforth:r*5 r2 jr5BW0HW(2)where:0=the permeability of free space,
16、B=the magnetic flux density vector,andH=the magnetic field vector.3.2.2.1 DiscussionIn common usage the word“relative”is frequently dropped.The real part of complex relativepermeability(r)is often referred to as relative permeability orsimply permeability.The imaginary part of complex relativepermeability(r)is often referred to as the magnetic lossfactor.In anisotropic media,permeability is described by athree dimensional tensor.3.2.2.2 DiscussionFor the purposes of this test method,the media is