A PCB engineer’s guide to TP-1/2 PPO ceramic microwave laminate — properties, Dk tuning from 3 to 25, Rogers equivalents, fabrication tips, and FAQs.
When an RF project lands on my desk asking for a dielectric constant above 6 with a loss budget that won’t wreck the link, I usually reach for one of two things: a filled-PTFE laminate from a well-known US brand, or a TP-1/2 PPO ceramic microwave laminate from Jiangsu. The second option catches most design engineers off guard because it uses a resin system (polyphenylene oxide) that many of us associate with low-Dk FR4 replacements, not with ceramic-loaded high-Dk boards. But the TP series quietly powers a lot of radar modules, GPS antennas, and satellite front-ends, and the reason is simple: it’s a homogeneous ceramic-PPO composite with no woven glass cloth, which changes the way signals behave on the board.
This article walks through what the TP-1/2 PPO ceramic microwave laminate actually is, the numbers that matter when you’re selecting it, how it compares to the usual suspects, and the fabrication quirks you’ll want to know before releasing Gerbers.
What Is the TP-1/2 PPO Ceramic Microwave Laminate?
TP is a thermoplastic high-frequency substrate manufactured by Taizhou Wangling Insulating Materials Factory. The dielectric layer is a blend of ceramic powder plus polyphenylene oxide (PPO) resin, with no fiberglass weave inside. That’s the headline difference from almost every other laminate in the same Dk bracket — you don’t have a glass yarn pattern running through the board, so Dk is the same whether a trace runs over a warp bundle or between them.
Naming is straightforward:
| Designation | Description |
| TP | Raw dielectric sheet, no copper cladding |
| TP-1 | Single-sided copper-clad laminate |
| TP-2 | Double-sided copper-clad laminate |
So when a fabricator quotes “TP-2 1.0 mm Dk 6.0,” they mean a 1.0 mm double-sided copper-clad PPO-ceramic board with a bulk dielectric constant of 6.0. Inside the TP family, the Dk is labelled at the end of the part number — TP440 means Dk 4.4, TP1020 means Dk 10.2, and so on.
Why No Glass Fiber Matters
Woven-glass reinforcement is standard in FR4, in the RO4000 hydrocarbon family, and even in many PTFE laminates. It stabilises mechanical properties and pulls Z-axis CTE down, but it creates two electrical headaches:
- Dk inhomogeneity — the glass bundles have a higher Dk than the resin gaps around them, so a 50 Ω microstrip run aligned with a glass bundle actually has a different impedance from one running between bundles. At 77 GHz automotive radar frequencies this “fiber weave effect” ruins skew budgets.
- Surface roughness at the resin-glass interface — contributes to insertion loss as frequency climbs.
By swapping the glass cloth for a homogeneous ceramic filler, the TP-1/2 PPO ceramic microwave laminate sidesteps both issues. The trade-off is that without glass, the board is more dependent on the resin and ceramic ratio for mechanical stability — which is why Wangling uses a specialised hot-press process rather than a typical prepreg lay-up.
Electrical Properties Summary
The spec that sells this material is the tunable dielectric constant. By changing the ratio of ceramic to PPO, the same manufacturing line produces substrates anywhere from Dk 3 up to Dk 25. In practice, the commercially stocked grades cluster around these values:
| Grade | Dielectric Constant (Dk) | Typical Application |
| TP300 | 3.0 | Wide-band antennas, low-loss feed lines |
| TP440 | 4.4 | General RF, Wi-Fi modules |
| TP600 | 6.0 | L/S-band radar, GPS |
| TP615 | 6.15 | Rogers RO3006 drop-in |
| TP920 | 9.2 | X-band patch antennas |
| TP960 | 9.6 | C/X-band microstrip |
| TP1020 | 10.2 | High-Dk couplers, miniaturised antennas |
| TP1100 | 11.0 | Phase shifters |
| TP1600 | 16.0 | Compact resonators |
| TP2000 | 20.0 | Size-critical RF front-ends |
The dissipation factor rises slightly as frequency increases, but within the sub-10 GHz window it remains low enough for most radar and satellite-communication budgets. Dk is quoted as stable across the operating-temperature range, which is critical when the board has to hold impedance through a thermal cycle in a vehicle roof or an antenna radome.
Thermal and Mechanical Properties
One reason designers hesitate with PPO-based laminates is legacy memory: early PPO materials from the 1960s had chemistry problems with solvent-based PCB processing. Modern TP-series material uses a different PPO formulation and handles aqueous processing fine.
| Property | Typical Value / Range | Notes |
| Operating temperature | -100 °C to +150 °C (long-term) | Wider low-temperature margin than most PTFE |
| Solderability | Compatible with wave and reflow soldering | Standard reflow profiles acceptable |
| Water absorption | Very low | Stable Dk in humid environments |
| Copper peel strength | Higher than vacuum-coated ceramic substrates | PPO wets the foil well |
| Machinability | Drill, mill, shear, turn, grind, etch | Much easier than pure ceramic |
| Thickness range | 0.5 mm to 12.0 mm | Wider than most RF laminates |
That thickness range is another detail worth flagging. Most high-Dk PTFE laminates top out around 2.5–3.0 mm. The TP-1/2 PPO ceramic microwave laminate can be pressed out to 12 mm in a single sheet, which opens up thick-substrate applications like dielectric resonators and bulk filter bodies.
How TP-1/2 Compares to Common Microwave Laminates
When I’m deciding between a TP grade and a more familiar alternative, this is roughly how the trade-off shakes out:
| Material | Resin System | Reinforcement | Dk Range | Typical Use Case |
| TP-1/2 PPO Ceramic | PPO + ceramic | None (ceramic filler only) | 3 – 25 | High-Dk antennas, radar, GPS |
| Rogers RO3000 series | PTFE + ceramic | None | 3.0 – 10.2 | mmWave radar, 5G |
| Rogers RO4000 series | Hydrocarbon + ceramic | Woven glass | 3.38 – 6.15 | Cost-sensitive RF |
| Rogers RT/duroid 6006/6010 | PTFE + ceramic | None | 6.15 / 10.2 | Precision microstrip |
| F4B / PTFE-glass | PTFE | Woven glass | ~2.55 | Broad RF, low Dk |
The closest functional competitors are the Rogers RO3000 and RT/duroid 6000 families — also non-woven, also ceramic-loaded. The TP-1/2 PPO ceramic microwave laminate differs from both in resin system: PPO instead of PTFE. What you get from that swap is easier through-hole plating, better copper adhesion, and simpler drilling, because PPO behaves more like a conventional thermoset than the slippery, smear-prone PTFE. What you give up is the absolute lowest loss at very high frequencies — PTFE still wins above 20 GHz.
Typical Applications in the Field
The material finds its way into systems where a high and precisely controlled Dk matters more than chasing the last fraction of a dB in loss:
- GPS and GNSS patch antennas — high Dk shrinks the patch area, which matters for wearables and small IoT modules.
- Radar systems — L-band, S-band, and C-band ground radars, marine radars, and weather radar front-ends.
- Satellite communication — Ku-band and C-band down-converter boards and LNB modules.
- Beidou navigation terminals — a significant chunk of Chinese domestic Beidou hardware runs on TP grades.
- Phased array sub-assemblies — couplers, power dividers, and phase shifters benefit from the homogeneous dielectric.
- Base station filters and duplexers — higher Dk lets you pack resonators closer together.
- Electronic countermeasures and EW equipment — wide operating temperature range and mechanical robustness help.
If you’re working on commercial Wangling PCB designs, the TP series sits alongside F4B PTFE-glass and WL-CT hydrocarbon-ceramic in the same catalog, so specifying one in a stack-up with another from the same vendor is straightforward from a procurement angle.
PCB Fabrication Notes for TP-1/2 PPO Ceramic Microwave Laminate
From the fabrication side, there are some quirks worth building into your design release:
Stack-up. Because TP is only available as TP-1 or TP-2 (single or double copper-clad), designs are almost always 1-layer or 2-layer. Multilayer TP boards are technically possible with bonding film but uncommon — if you need 4+ layers of high-Dk material, consider a hybrid stack-up with FR4 or RO4000 on the outer layers and TP as a core. A common 2-layer example looks like:
| Layer | Material | Typical Thickness |
| Top copper | Cu foil | 35 µm (1 oz) or 70 µm (2 oz) |
| Core | TP dielectric | 0.5 – 12.0 mm |
| Bottom copper | Cu foil | 35 µm (1 oz) or 70 µm (2 oz) |
Panel size. Maximum panel on TP laminate is typically 150 mm × 220 mm for finished boards. Array accordingly.
Drilling. PPO drills more like a thermoset than PTFE — standard tungsten-carbide bits, moderate feed rates, no special plasma etch required for through-hole cleaning. That’s a real time and cost saver compared with PTFE, which almost always needs sodium etch or plasma desmear.
Plating. Copper adhesion on TP is better than on vacuum-metallised ceramic substrates. Peel strength is high enough that plated-through-hole reliability in thermal cycling is solid.
Surface finish. Everything you’d expect: HASL, ENIG, immersion silver, immersion tin, OSP, pure gold, ENEPIG, bare copper. For RF performance I default to immersion silver or ENIG — they’re flat and predictable.
Soldermask and silkscreen. Standard LPI soldermask in green, black, blue, red, yellow, white works fine. The substrate doesn’t fight the mask chemistry.
Design Guidelines From Experience
A few things I’ve learned the hard way when designing on the TP-1/2 PPO ceramic microwave laminate:
Double-check the Dk grade against the part number. TP440 is Dk 4.4, TP1020 is Dk 10.2 — a mistake here means every transmission line is wrong. Put the grade directly in the fab drawing.
Use the manufacturer’s Dk at your actual operating frequency, not the generic nameplate. Dk drift with frequency is small but not zero. If you’re designing a 10 GHz antenna, ask Wangling for the Dk at 10 GHz, not at 1 MHz.
Check copper weight against trace width. High-Dk boards mean very narrow 50-Ω traces. On a 0.8 mm TP600 core with 1 oz copper, a 50-Ω microstrip is under 1.2 mm wide. For good etch factor, 0.5 oz copper is often a better starting point on higher-Dk grades.
Respect the thickness tolerance when doing impedance-controlled work. Ask the fab house for their as-shipped thickness measurements on the TP laminate before you finalise line widths — in-house impedance coupons are worth their weight.
Thermal management. The thermal conductivity of the PPO ceramic composite is modest. For high-power amplifier stages, bond a metal backing plate or use plated through-vias as thermal paths, same as you would for any ceramic-filled laminate.
Useful Resources and Datasheet Links
If you want to dig deeper into the specs, here are the primary-source resources I use:
- Taizhou Wangling Insulating Materials Factory official site — https://www.wang-ling.com.cn/index-en.html — datasheets for TP series, F4B, WL-CT, and other Wangling product lines.
- Wangling PCB fabrication partner — https://www.raypcb.com/Wangling-pcb/ — application engineering and prototype fabrication on TP-series materials.
- Microwave Journal — RF Laminate Formulation Trends — https://www.microwavejournal.com/blogs/1-rog-blog/post/27706-tracking-trends-in-rf-laminate-formulations — background on PTFE vs PPE/PPO system differences.
- IPC-4103 — industry specification for high-speed/high-frequency laminates; useful when writing a fab drawing note.
- Epec — RF/Microwave Laminate Materials guide — https://www.epectec.com/pcb/rf-microwave-laminate-material.html — vendor-agnostic overview of microwave laminate choices.
- Rogers Technical Papers library — https://rogerscorp.com/advanced-electronics-solutions — useful for cross-referencing TP grades to RO3000 and RT/duroid equivalents.
FAQs
How does the TP-1/2 PPO ceramic microwave laminate differ from Rogers RO3000 series?
Both are non-woven ceramic-filled composites, but the resin is different. RO3000 uses PTFE; TP uses modified PPO. TP is easier to drill and plate and generally less expensive, while RO3000 has lower loss at frequencies above 20 GHz. For applications below 15 GHz they’re largely interchangeable on a Dk-matched basis — TP615 for RO3006, TP1020 for RO3010.
Can TP-series PCBs be processed like standard FR4?
Broadly yes. Because there’s no PTFE in the resin, standard drilling, plasma desmear, aqueous cleaning, and soldermask chemistry all work. The biggest differences are higher-precision drilling is needed to avoid resin smear on the barrel walls, and thickness tolerance should be verified against impedance targets. Any PCB fab house that handles Rogers RO4000 can usually handle TP.
What is the maximum operating frequency for TP-1/2 PPO ceramic laminates?
Wangling documents stable dielectric performance through about 10 GHz, with usable performance above that for less loss-sensitive designs. For 20 GHz+ millimetre-wave work a PTFE-ceramic laminate (RO3003, RT/duroid 5880) is the better engineering choice.
Is TP-2 suitable for multilayer PCBs?
TP-2 by itself is a 2-layer board. For multilayer designs you bond multiple TP cores with a suitable bonding film, or you mix TP cores with FR4 / RO4000 prepreg in a hybrid stack-up. Hybrid constructions are the more common approach when you need 4+ layers with TP as a functional high-Dk layer.
How does high Dk help with antenna miniaturisation?
Antenna electrical length scales with the wavelength in the substrate, which is the free-space wavelength divided by the square root of Dk. A patch on a Dk-10 TP1020 substrate is roughly one-third the physical size of the same patch on a Dk-2.2 substrate. That’s the entire reason GPS and GNSS modules gravitate to high-Dk ceramic composites — they fit inside watches and small IoT devices.
Final Thoughts
The TP-1/2 PPO ceramic microwave laminate doesn’t get the same marketing coverage as the big Western brands, but for high-Dk, homogeneous-dielectric microwave work it’s a legitimate engineering choice. Tunable Dk from 3 to 25, no fiber-weave effect, wide thickness range up to 12 mm, and conventional PCB processing chemistry make it well-matched to radar, GPS, satcom, and antenna-miniaturisation applications. Cross-reference the grade against Rogers RO3000 or RT/duroid 6000 equivalents when writing the BOM, and make sure your fabricator has physical experience with the material before committing to the first build.
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A PCB engineer’s guide to TP-1/2 PPO ceramic microwave laminate — properties, Dk tuning from 3 to 25, Rogers equivalents, fabrication tips, and FAQs.