Relative Dielectric Constants
| Material | Er |
| Air | 1.0 |
| PTFE/glass 2800 | 2.2 |
| Rogers RO | 2.9 |
| CE/goreply | 3.0 |
| BT/goreply | 3.3 |
| GETEK | 3.5 |
| CE/glass | 3.7 |
| Silicon dioxide | 3.9 |
| BT/glass | 4.0 |
| Polymide/glass | 4.1 |
| FR-4/glass | 4.1 |
| Glass cloth | 6.0 |
| Alumina | 9.0 |
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