The domestic PTFE workhorse. Eight F4B laminates with Dk from 2.20 to 6.15 — excellent value for antennas and RF front ends, with custom thicknesses easy to arrange from our stocking program.
Exact values from supplier datasheets. Standard dielectric thickness in mm, excluding metal layers.
| Model | Dk | Df | Standard thickness (mm) | Typical applications |
|---|---|---|---|---|
| F4BM220 | 2.20 ± 0.04 | 0.0010 | Standard set (see note) | Antenna, RF front end |
| F4BM255 | 2.55 ± 0.05 | 0.0013 | Standard set (see note) | Antenna, coupler |
| F4BM265 | 2.65 ± 0.05 | 0.0015 | Standard set (see note) | Antenna, filter |
| F4BM300 | 3.0 ± 0.05 | 0.0017 | Standard set (see note) | RF front end |
| F4B350 | 3.5 ± 0.05 | 0.0025 | Standard set (see note) | Filter, RF module |
| F4BTM400 | 4.00 ± 0.08 | 0.0030 | Standard set (see note) | Compact antenna |
| F4BTM440 | 4.40 ± 0.10 | 0.0033 | Standard set (see note) | Compact antenna, loading |
| F4BTM615 | 6.15 ± 0.12 | 0.0045 | Standard set (see note) | Miniaturized antenna |
All eight models share the standard thickness set: 0.127 / 0.254 / 0.508 / 0.762 / 1.016 / 1.524 / 2.0 / 3.0 mm — other thicknesses can be customized.
Capabilities that apply to every F4B (Wang Ling) board we build.
Comparable RF performance to premium brands at a significantly lower price point — ideal when BOM cost drives the design.
Standard 0.127 / 0.254 / 0.508 / 0.762 / 1.016 / 1.524 / 2.0 / 3.0 mm; other thicknesses on request.
<50 Ω ± 5 Ω; ≥50 Ω ± 10% — verified per panel with coupon testing.
F4B + FR-4 hybrids are one of our most requested cost-optimized builds.
Upload your Gerber files — our engineers will confirm the right F4B (Wang Ling) laminate, thickness and stack-up for your Dk/Df and impedance targets, free DFM review included.
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