MEGTRON 7 Dk and Df
Panasonic MEGTRON 7: Dk 3.31 and Df 0.0023 at 14 GHz (0.75 mm, BCDR). In the pcbplanner material library it is listed under ultra-low loss materials, with a glass transition temperature of 200 °C.
Datasheet values
| Entry | Dk | Df | at | Tg | Construction and test method |
|---|---|---|---|---|---|
| MEGTRON 7 (R-5785N), low-Dk glass | 3.31 | 0.0023 | 14 GHz | 200 °C | 0.75 mm, BCDR. |
Dk and Df depend on the glass style, the resin content and the test method, so the same product has different values in different constructions. Compare materials at the same frequency and, where possible, with the same method; for a construction not listed here, use the manufacturer’s construction table.
Dk and Df from 1 to 20 GHz
The datasheet gives one frequency. The table extends that point with the Djordjevic–Sarkar wideband Debye model, the same model the impedance and trace-loss calculators use: it keeps Df nearly flat and lets Dk fall slowly with frequency. These are model values, not measurements.
| Entry | 1 GHz | 2 GHz | 5 GHz | 10 GHz | 20 GHz |
|---|---|---|---|---|---|
| MEGTRON 7 (R-5785N), low-Dk glass | 3.32 / 0.0024 | 3.32 / 0.0024 | 3.32 / 0.0024 | 3.31 / 0.0023 | 3.31 / 0.0022 |
Each cell is Dk / Df.
Use it in a calculation
Similar materials
- Isola Tachyon 100G – Dk 3.02 and Df 0.0021 at 10 GHz
Other datasheet pages: Panasonic MEGTRON 6 · Panasonic MEGTRON 4 · Rogers RO4350B · Rogers RO4003C · Rogers RO3003 · Rogers RT/duroid 5880 · Isola 370HR · Isola FR408HR · Isola I-Speed · TUC TU-872 SLK · Shengyi S1141 · Shengyi S1000-2M · Nan Ya NP-155FR · DuPont Pyralux AP · DuPont Pyralux HP · Taiyo PSR-4000 solder mask
Sources
- Panasonic MEGTRON 7 R-5785(N) data sheet (2024). Low-Dk glass, 0.75 mm: Dk 3.31, Df 0.0023 at 14 GHz (BCDR); Tg 200 °C.