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Properties guide pdf Advanced Circuit Materials Division S Roosevelt Avenue Chandler AZ Tel - - Fax - - www rogerscorporation com High Frequency Circuit Materials Properties Guide Featured in this guide Key Properties Definitions Key Properties Aliases Sy

Advanced Circuit Materials Division S Roosevelt Avenue Chandler AZ Tel - - Fax - - www rogerscorporation com High Frequency Circuit Materials Properties Guide Featured in this guide Key Properties Definitions Key Properties Aliases Symbols Units of Measure Target Ranges Test Methods Design Criteria Conversion Tables Rogers RT duroid laminates TMM laminates RO materials and RO materials have key electrical and mechanical properties designers use to select the ideal material for a particular application These properties are listed on our data sheets selector guide and website For those who are not design engineers what the values and units represent may not be easily understood The test methods used to determine these values might not be known and the impact these properties have on design may not be readily evident The purpose of this properties guide is to define each key property how we test it and how each property is critical to design Table of Contents Dielectric Constant page Dissipation Factor page Insulation Resistance page Volume Resistivity page Surface Resistivity page Thermal Coefficient of Dielectric Constant page Dielectric Strength page Young ? s Modulus page Compressive Modulus page Flexural Modulus page Moisture Absorption page Thermal Conductivity page Coefficient of Thermal Expansion page Peel Strength page Glass Transition Temperature page Dimensional Stability page Flammability Rating page Impact Notch Izod page Acknowledgements page Conversion Tables page Key Properities Main Chart page The world runs better with Rogers Page DIELECTRIC CONSTANT and DISSIPATION FACTOR KEY PROPERTY Dielectric Constant ALIAS Relative Permittivity Dissipation Factor loss tangent tan d approx power factor SYMBOL K ? DK e r tan d DF K ? ? K ? UNIT OF MEASURE UNITS Ratio of the permittivity of a substance to the permittivity of free space Ratio of loss to capacity None None DEFINITIONS Dielectrics are materials that do not conduct electricity that is they are insulators In the most fundamental electrostatic terms two quantities of electrical charge Q and Q ? in free space vacuum at a given distance r will repel each other with a mechanical force F by the relationship where the value of e is the absolute permittivity of free space e that is the smallest possible value Replacing free space with a dielectric reduces the force in proportion to its value of e If Q and Q ? have the same sign or ?? then the value of F is positive indicating repulsion If they differ then F is negative indicating attraction The ratio of e to e is called the relative permittivity or dielectric constant Dk Any dielectric other than a vacuum has the internal capability of responding by limited charge separation to the electric field imposed by the Q and Q ? charges thus reducing the force This charge separation is also called a dipolar response constant insulator between them and again current must flow to keep the same voltage The ratio of electrical charge to voltage is referred to as capacitance of the system of plates and separation Dielectric constant