The laminate knowledge base — what the four key specifications mean, the major grades compared in one table, and how Rogers, Taconic, Isola, Arlon and Panasonic divide the market.
High-frequency laminate sourcing starts with a vendor brochure and ends with a signature — but the decisions in between are engineering decisions, and they deserve the underlying knowledge: what the specifications mean, which manufacturers stand behind which grades, and how the popular models actually differ. This guide assembles that knowledge base, with the major grades compared in one table.
Four numbers carry most of the meaning. Dielectric constant sets trace geometry and velocity; dissipation factor sets loss per wavelength; thermal conductivity and CTE set power handling and reliability; and moisture uptake predicts field drift. All four are measured at defined frequencies — a Dk quoted at 1 GHz says little about 28 GHz behavior — and all four interact with the impedance targets defined in the controlled impedance design rules. Reading datasheets at the right frequency, under the right conditions, is the first competence a buyer needs.
The grades below cover the majority of RF and microwave production worldwide. Values are typical datasheet figures at 10 GHz; verify against the specific lot and frequency in qualification.
| Material | Manufacturer | Dk | Df | Typical use |
|---|---|---|---|---|
| RO4350B | Rogers | 3.48 | 0.0037 | Base stations, automotive radar |
| RO3003 | Rogers | 3.00 | 0.0010 | 77 GHz radar, 5G antennas |
| RT/duroid 5880 | Rogers | 2.20 | 0.0009 | mmWave, satellite, low-loss RF |
| TLY-5 | Taconic | 2.20 | 0.0009 | Phased arrays, satellite |
| RF-35 | Taconic | 3.50 | 0.0018 | Cost-balanced RF circuits |
| Astra MT77 | Isola | 3.00 | 0.0017 | Automotive radar, aerospace |
| I-Tera MT40 | Isola | 3.38 | 0.0028 | 5G, high-speed digital |
| AD255C | Arlon | 2.55 | 0.0015 | Military radar, RF power |
| Megtron 6 | Panasonic | 3.40 | 0.0020 | High-speed routers, servers |
Rogers’ product line brackets the high-frequency market: the hydrocarbon RO4000 series overview for volume RF with standard processing, the RO3000 ceramic-filled PTFE family for radar and antennas, and the RT/duroid 5880 extreme for minimum loss at mmWave. Grade-specific behavior matters more than brand — the RO4350B material guide shows how one grade’s processing advantages explain its market position. Rogers material also carries the deepest fabricator familiarity, which shortens qualification on new programs.
Taconic’s glass-microfiber PTFE grades serve phased arrays and satellite work — the TLY-5 millimeter-wave analysis covers the flagship — while RF-35 competes on cost-performance balance. Isola’s thermoset lines target automotive radar and 5G with stable wide-temperature behavior. Arlon holds the military and RF-power niches with low-loss, thermally robust laminates. Panasonic’s Megtron family spans high-speed digital and RF front ends. Second-source discipline favors designs that approve alternates across these vendors rather than marrying one brand.
Run the parameters as a filter: frequency and loss budget cut the table to a few rows, power and environment cut further, and processing cost finishes it. Domestic alternatives now sit inside the same decision — the domestic-versus-Rogers gap analysis maps where substitution is realistic. Whatever the shortlist, close with a coupon in the candidate material, measured per the high-frequency PCB testing workflow — the table starts the conversation; the measurement ends it.
Frequently Asked Questions
Dissipation factor at your operating frequency. It drives the loss budget more than any other figure, and datasheet values quoted at the wrong frequency mislead more selections than any other cause.
Depth of the product line, fabricator familiarity, and two decades of qualification history. The grades are genuinely strong, and the ecosystem around them shortens qualification.
Yes, and you should. Approving alternates across vendors protects supply and price — but qualify each alternate with its own coupon data, since grades are similar, not identical.
In specific grades and applications, yes — the gap has narrowed to processing maturity rather than raw electricals. Qualify with the same coupon discipline as any other source.
Send your frequency, loss budget and volume and we will return a two-or-three-grade shortlist from the table — with the processing cost each choice carries.
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