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Material Constants for Common Dielectrics and Conductors used in the Microwave Industry

 

Although we believe the values indicated here are accurate for use in material characteristics, we do not guarantee the performance or operation of any component or system based on the information on this page.   Each application should be tested and verified fully with its operating parameters prior to using any material for an actual component.   Please contact Engineering Specialties Service for further information or more detailed design support. 

 

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Material

 (Trade name)

Dielectric Constant

(~ 10 GHz)

Loss Tangent

(~ 10 GHz)

Thermal Conductivity

Cal/(cm-sec-C)

Operating Temperature

Diamond

 5.7

 

2.87

>500C

Beryllium Oxide

6.7

.004

0.62

>500C

Aluminum Nitride

8.5

.004

0.40

>500C

Boron Nitride (HP)

4.11

0.002

0.15

>500C

Aluminum Oxide, (Alumina 99.8%)

9.98

0.0006

0.09

>500C

Aluminum Oxide, (Alumina 96 %)

9.7

0.0006

0.06

>500C

FR-4 circuit board

4.1

0.015

0.0008

250C

FLUOROSINT tm 500

2.8

.008

0.002

250C

Fluoroloy tm K

Or Rulon K

 

 

0.0006

250C

Fluoroloy tm H

Or Rulon H

2.4

.0003

.003

200C

Kapton  tm 2.9 0.005 0.00029 > 250C
Lexan  tm 2.95 0.02 0.0007 95C

Nylon

2.73

.004

 - - - -

75C

Pure Teflon tm

2.1

 0.0002

.0006

250C

Rexolite 1422

2.52 2.54

0.0006

.0004

100C

Fused Quartz

Silicon Dioxide

3.78

0.00006

 0.004

 >750C

Dry Air

1.001

0.0000

.00006

N/A

Water distilled

77

0.16

 

 

RTV Epoxy

~2.5

0.001

.0003

150C

 

Material Constants for Conductors used in the Microwave Industry

 

Material

 (Trade name)

Thermal Conductivity

Cal/(cm-sec-C)

Electrical Resistivity,

ohm-cm x 10-6

Silver

0.98

1.62

Copper

0.94

1.72

Gold

0.71

2.44

Aluminum

0.52

2.62

Brass,  66% Cu, 34% ZN

0.26

3.9

Nickel

0.22

6.9

Stainless Steel

0.05

10.5

                                                       

         

* Items followed by the (*) may be trade names from a single supplier using proprietary formulas. 

The data on this page is a summation of published results on these materials from the respective manufacturer.