Inquire: Call 0086-755-23203480, or reach out via the form below/your sales contact to discuss our design, manufacturing, and assembly capabilities.
Quote: Email your PCB files to Sales@pcbsync.com (Preferred for large files) or submit online. We will contact you promptly. Please ensure your email is correct.
Notes: For PCB fabrication, we require PCB design file in Gerber RS-274X format (most preferred), *.PCB/DDB (Protel, inform your program version) format or *.BRD (Eagle) format. For PCB assembly, we require PCB design file in above mentioned format, drilling file and BOM. Click to download BOM template To avoid file missing, please include all files into one folder and compress it into .zip or .rar format.
TP-1/2 PPO Ceramic Microwave Laminate: High-Dk Substrate Without Glass Fiber
Most RF engineers reach for PTFE-ceramic or hydrocarbon-ceramic laminates when they need better-than-FR4 microwave performance. Both are solid choices in the 3.0–6.15 Dk range. But when a design calls for Dk 10, Dk 16, or even Dk 20 — the territory where patch antenna dimensions shrink enough to fit inside a GPS receiver puck or a missile-borne seeker — neither PTFE-glass nor hydrocarbon-ceramic composites can deliver those dielectric constants at low loss without either becoming impractically heavy or suffering from sintered ceramic’s notorious machining limitations.
The TP-1/2 PPO ceramic microwave laminate from Taizhou Wangling Insulating Materials Factory occupies that specific niche. It is a glass-free, thermoplastic substrate combining polyphenylene oxide (PPO) resin with ceramic filler in a ratio that is deliberately tunable from Dk 3 all the way to Dk 25 — the widest single-family Dk range of any substrate in the Wangling catalogue. This article breaks down what TP-1/2 is, why the PPO-ceramic construction matters, which Dk grades serve which applications, how it processes in production, and where it sits relative to sintered ceramic substrates and Rogers high-Dk laminates.
What Is the Wangling TP-1/2 PPO Ceramic Microwave Laminate?
Material Architecture: PPO Resin Plus Ceramic, Nothing Else
The TP series dielectric layer consists of ceramic and polyphenylene oxide resin (PPO). The sheet contains no glass fiber reinforcement of any kind. Unlike every other Wangling substrate family — F4BM uses woven glass, WL-CT uses woven glass, even TFA uses nano-ceramic without glass but is PTFE-based — the TP series is built on a fundamentally different polymer: PPO.
Polyphenylene oxide (also called polyphenylene ether, PPE) is a high-performance engineering thermoplastic known for its thermal stability, inherent low dielectric constant, and low dissipation factor. Rogers Corporation built its RO4000 hydrocarbon series around a hydrocarbon resin system related to this chemistry, but TP takes a different approach: it uses PPO as a thermoplastic matrix rather than a thermosetting one, and loads it with ceramic particles at high volume fractions to engineer Dk values far above what any unfilled polymer can achieve.
The Dk is adjusted precisely by adjusting the ratio between ceramic and PPO resin. The higher the ceramic loading, the higher the Dk. At low ceramic loading you get Dk 3.0–4.4; at high loading you reach Dk 10.2, 16, 20, and beyond. The PPO matrix holds the ceramic particles in a stable, uniform composite that processes like a thermoplastic — machinable, drilable, sheerable — rather than like a sintered ceramic block.
Naming Convention: TP, TP-1, and TP-2
The Wangling naming logic is simple and worth stating clearly before specifying:
Designation
Description
TP
Bare substrate — no copper foil (smooth surface material)
TP-1
Single-sided — copper foil on one side only
TP-2
Double-sided — copper foil on both sides
The suffix number does not indicate a Dk grade. Dk is encoded separately in the model number — for example, TP1020 indicates a TP-series substrate with a dielectric constant of 10.2. This is the same convention used across the Wangling catalogue (TFA294 = TFA at Dk 2.94; WL-CT350 = WL-CT at Dk 3.5).
The Core Engineering Problem TP-1/2 Solves: High-Dk Without Sintered Ceramic
Why High Dielectric Constant Matters in Antenna and Filter Design
In antenna engineering, the physical size of a resonant element — a patch antenna, a microstrip resonator, a dielectric filter cavity — scales inversely with the square root of the substrate’s dielectric constant. At GPS L1 (1.575 GHz), a half-wavelength patch on FR4 (Dk 4.2) measures approximately 47 mm across. On a substrate with Dk 10.2, that same patch shrinks to approximately 30 mm — a 36% reduction in linear dimension, which translates to a 59% reduction in patch area. On Dk 20, the patch shrinks further to 21 mm across.
For applications where circuit board real estate is critically limited — GPS modules inside watches, Beidou receivers in smartphones, missile-borne seekers, miniaturised radar altimeters — this shrinkage is not a cosmetic benefit. It is the primary design enabler. The substrate materials with naturally high-Dk options (Dk 10+) in a machinable, PCB-processable format are very few. Sintered ceramics offer high Dk but cannot be drilled, etched, or cut on standard PCB equipment. Most PTFE-ceramic composites top out at Dk 10.2 with limited thickness options and significant cost. The TP-1/2 PPO ceramic microwave laminate fills this gap with a machinable, copper-clad substrate available across a Dk range that sintered ceramics cover but PCB-processable materials historically have not.
Why Not Just Use Sintered Ceramic?
The machinability question is the crux. Sintered ceramic substrates — alumina, LTCC, barium titanate composites — are brittle, cannot be drilled by standard carbide tooling, require diamond cutting for any shaping, crack under thermal cycling at plated through holes, and cannot be processed through standard PCB etching chemistries. Assembly onto sintered ceramics requires wire bonding or flip-chip attachment; conventional reflow soldering with copper-clad land patterns is not possible without specialist processes.
The TP-1/2 PPO ceramic composite solves this by providing the dielectric constant of high-Dk ceramic in a matrix that can be drilled, turned, ground, sheared, and etched, and which accepts standard copper foil adhesion without the vacuum-coating metallisation required for bare ceramic. The adhesion between copper foil and the PPO-ceramic dielectric is more reliable than that of ceramic substrates with vacuum coating, making the TP-1/2 stack durable under standard PCB assembly and environmental cycling.
TP-1/2 PPO Ceramic Microwave Laminate: Available Dielectric Constants and Key Specifications
Dk Range and Common Grades
The dielectric constant can be selected within the range of 3 to 25 according to circuit requirements, and it is stable. The most commonly stocked grades and their application spaces are:
One important characteristic worth understanding before designing with high-Dk TP grades: the dielectric loss increases as frequency increases, but the change is not significant within 10 GHz. This is characteristic of PPO-ceramic composites, where the polymer matrix contribution to loss increases with frequency at a rate governed by the PPO loss tangent, while the ceramic filler provides a stabilising low-loss contribution.
In practice, the TP-1/2 grades are best suited to applications up to approximately 10 GHz for low-loss-critical designs, and remain usable to higher frequencies in applications where Dk-enabled miniaturisation matters more than absolute insertion loss — such as compact resonator filters, dielectric resonator antennas, and GPS patch elements where the radiating efficiency tolerates moderate substrate loss.
TP-1/2 vs Rogers High-Dk Ceramic Laminates: Honest Comparison
The international comparators for TP-1/2 in the high-Dk space are Rogers RT/duroid 6006 (Dk 6.15), RT/duroid 6010 (Dk 10.2), and the Rogers RO3200 series (ceramic-filled laminates with Dk 3.02, 6.15, and 10.2). These are the substrates that have traditionally defined the performance envelope for high-Dk microwave PCB work.
The TP-1/2 advantages are clear in three areas: Dk flexibility (no other PCB-processable substrate offers Dk 11, 16, or 20 in a machinable copper-clad format), thickness range (up to 12 mm, far exceeding Rogers options), and cost. The Rogers RT/duroid series holds the edge on loss tangent (both 6006 and 6010 publish Df around 0.0023–0.0027 at 10 GHz, better than TP-1/2’s absolute value), but for many antenna and filter applications the miniaturisation benefit of higher Dk outweighs the absolute loss difference.
Applications Where TP-1/2 PPO Ceramic Microwave Laminate Excels
GPS, Beidou, and GNSS Patch Antenna Elements
This is the highest-volume application for TP-1/2. Satellite navigation patch antennas for GPS L1 (1.575 GHz), Beidou B1 (1.561 GHz), Galileo E1 (1.575 GHz), and GLONASS L1 (1.602 GHz) all operate at frequencies where substrate Dk directly determines physical antenna footprint. Using Dk 9.6 or Dk 10.2 TP-1/2 substrate reduces a standard GPS patch from roughly 47 mm square (on FR4-equivalent) to approximately 30 mm square — a size that fits inside compact GPS module housings, wearable devices, and vehicle integration designs where antenna board area is architecturally constrained.
TP high-frequency PCBs are utilised in applications such as Beidou, missile-borne systems, fuzes, and miniaturised antennas. The use in missile fuzes and Beidou missile-borne systems reflects the -100°C lower operating limit — an extreme cold-soak requirement that few substrate materials meet, and that the PPO-ceramic composite handles by virtue of PPO’s inherent cryogenic toughness.
Miniaturised Microwave Filters and Diplexers
Bandpass filters and diplexers for satellite transponder frequency separation, GPS L1/L2 dual-band receivers, and compact radar front-ends all benefit from the circuit miniaturisation that high-Dk substrates enable. A coupled-line bandpass filter at 1.575 GHz on Dk 10.2 TP-1/2 is approximately one-third the length of the same filter on Dk 3.0 material. For satellite receivers where multiple filter functions must fit in a small RF front-end module, this size reduction is design-enabling.
The TP-1/2 thickness range — up to 12 mm — is another advantage here. Thick dielectric substrates are used in dielectric resonator-based filter designs where the substrate itself forms part of the resonant cavity. No other PCB-processable substrate in the Wangling catalogue offers 8 mm, 10 mm, or 12 mm dielectric thickness in a copper-clad, machinable format.
Radar Altimeters and Missile-Borne Electronics
Military radar altimeters and missile guidance electronics operate across extreme temperature ranges, high vibration environments, and must meet stringent size and weight budgets. The TP-1/2 PPO ceramic composite’s -100°C to +150°C operating temperature range is broader than most PCB substrates — only PTFE-based materials reach comparable cryogenic performance. Combined with the circuit miniaturisation enabled by Dk 10–20 grades and the machinability advantage over sintered ceramic, TP-1/2 is a practical substrate for conformal missile-borne antenna elements and proximity fuze electronics.
Dielectric Resonator Antenna (DRA) Substrates
Dielectric resonator antennas use the substrate dielectric volume itself as the radiating element, with the resonant frequency determined by substrate dimensions and Dk. Higher-Dk substrates produce smaller, more physically compact DRAs. The TP-1/2 grades with Dk 9.2 through 11 sit in the sweet spot for DRA designs targeting L-band and S-band frequencies, where the resonator must be compact enough for integration into consumer or military hardware but the substrate thickness must be substantial (typically 3–8 mm for DRA operation). The TP series’ availability in thick formats up to 12 mm, combined with full machinability, makes it the practical choice for DRA work that pure ceramic cannot support without specialist fabrication.
Fabrication Requirements and Critical Limitations for TP-1/2
Processing Strengths: Machining Superiority Over Sintered Ceramic
The material is easy to machine and can be processed through drilling, turning, grinding, shearing, etching, and other methods, which ceramic substrates cannot achieve. In production, standard carbide-tipped drill bits work for via and mounting hole drilling. The PPO matrix is far tougher than sintered ceramic — it does not crack or chip on drill entry and exit. Milling to shape and scoring/shearing for singulation all work normally.
Copper etching uses standard ferric chloride or cupric chloride chemistry — the same as FR4. No sodium etch or plasma activation steps are needed (unlike PTFE). Surface finish deposition (ENIG, immersion silver, HASL) processes on standard plating lines.
The Multilayer Limitation Is Real and Non-Negotiable
The most important constraint for any designer evaluating TP-1/2 is this: due to the thermoplastic nature of the material, it is generally not recommended for multilayer PCB processing. If multilayer PCB processing is required, low-temperature bonding sheets must be selected, and feasibility must be fully considered.
The thermoplastic PPO matrix does not cross-link like a thermoset. Under the temperatures and pressures of standard multilayer lamination, the PPO matrix will deform rather than bond. This limits TP-1/2 PCBs to single-layer or double-sided (TP-2) designs in virtually all standard board house processes. Engineers who need high-Dk multilayer RF substrates should look at ceramic-filled PTFE laminates (TFA615, TFA1020) or high-Dk hydrocarbon ceramic laminates (WL-CT615) that support multilayer lamination.
Panel Size Constraint
The maximum PCB size is 150 mm × 220 mm — significantly smaller than the 460×610 mm or 915×1220 mm panels available for other Wangling substrates. This limits TP-1/2 to small-to-medium designs and rules out large-format antenna arrays or panel-level production of large boards. For GPS patch elements, compact filters, and miniaturised radar front-ends this constraint is rarely a problem. For large phased arrays or infrastructure antenna panels it eliminates TP-1/2 from consideration.
Surface Finish Selection
Surface Finish
Suitability for TP-1/2 Applications
Notes
ENIG
Excellent
Best for GPS and navigation antenna elements; flat, reliable
Immersion Silver
Very Good
Slightly lower loss; tarnish risk in humid storage
Pure Gold
Best for high-reliability mil/aero
Used in missile-borne and fuze applications
HASL
Acceptable for lower-frequency use
Surface planarity adequate below 5 GHz
OSP
Limited
Oxidation risk; use only for short-cycle assembly
ENEPIG
Best above 10 GHz
Pd layer removes Ni magnetic loss; premium cost
Useful Technical Resources for TP-1/2 PPO Ceramic Microwave Laminate
Resource
Description
Link
Wangling TP-1/2 Product Page
Official TP series overview with Dk range and naming
FAQ 1: What Dk value should I choose for a GPS L1 patch antenna?
For a standard GPS L1 (1.575 GHz) patch antenna where physical size reduction is the goal, the Dk 9.6 and Dk 10.2 grades are the most commonly used. Both produce patch antenna dimensions in the 29–32 mm range for standard half-wavelength designs at 1.575 GHz — compact enough for most GPS receiver module housings. The Dk 9.2 grade gives slightly larger patches with marginally better efficiency (lower substrate loss) if your housing can accommodate the extra few millimetres. The Dk 6.15 grade is appropriate if circuit miniaturisation is secondary and you want lower loss in the antenna ground plane and feed network, at the cost of a larger patch footprint.
FAQ 2: Can TP-1/2 be used above 10 GHz?
Yes, with caveats. The dielectric loss in TP-1/2 increases with frequency — it is a PPO-ceramic thermoplastic, not a PTFE-ceramic composite, and the polymer loss tangent is higher at microwave frequencies than PTFE’s. Within 10 GHz, the loss increase is not significant and the substrate is routinely used for GPS, Beidou, and S-band radar applications. Between 10 and 20 GHz the loss becomes a more significant insertion loss contribution, particularly for the high-Dk grades where the ceramic loading is high. For designs where every 0.1 dB of insertion loss matters above 10 GHz — phased array T/R modules, mmWave filters — TFA or WL-CT grades with PTFE or hydrocarbon resin bases are better choices. TP-1/2 above 10 GHz is appropriate for compact resonator designs where circuit size reduction justifies the higher loss budget.
FAQ 3: Why is the maximum panel size only 150 mm × 220 mm?
The thermoplastic PPO matrix is pressed and bonded differently from thermoset laminates. The production process is special, and the panel size constraint reflects the limitations of the specialist tooling and pressing process used to achieve uniform ceramic dispersion and copper adhesion across the substrate. For the intended applications — compact GPS patches, small filter boards, miniaturised radar front-ends — this panel size is rarely a binding constraint. A 150×220 mm panel yields multiple GPS patch substrates per panel with standard panelisation and V-scoring.
FAQ 4: How does TP-1/2 compare to Rogers RT/duroid 6010 for a GPS patch antenna?
Rogers RT/duroid 6010 (Dk 10.2) has a published Df of 0.0023 at 10 GHz, which is better than typical TP-1/2 Dk 10.2 material in absolute loss terms. The Rogers material also supports multilayer construction and has established international aerospace qualification pedigree. For a GPS patch antenna at 1.575 GHz where insertion loss in the substrate is small compared to antenna radiation efficiency, the Df difference between TP-1/2 and RT/duroid 6010 is second-order — both substrates produce comparable patch efficiency at L-band frequencies. The practical advantages of TP-1/2 are cost (significantly lower than Rogers premium PTFE laminates), broader Dk selection, and greater thickness availability. For mil-aero programmes with RT/duroid qualification requirements, Rogers remains the safer material choice. For commercial GPS module production where qualification flexibility exists, TP-1/2 Dk 10.2 delivers the same miniaturisation result at lower material cost.
FAQ 5: What happens if a board house tries to make a multilayer PCB using TP-1/2?
The thermoplastic PPO matrix will deform and flow under standard multilayer lamination temperatures (typically 180°C and above for thermoset presses). The result is a distorted, delaminated, or mechanically compromised board. Unlike thermoset materials that cure irreversibly at lamination temperature, PPO softens and flows above its softening point during the press cycle. If multilayer construction is genuinely required, the board house must use low-temperature bonding sheets specifically qualified for thermoplastic lamination — and even then, the stack depth is limited. The strong engineering recommendation is to design TP-1/2 circuits as single-layer or double-sided boards, and move any digital control or power routing to a separate FR4 board interconnected by connectors.
Summary: When TP-1/2 PPO Ceramic Microwave Laminate Is the Right Substrate
The TP-1/2 PPO ceramic microwave laminate occupies a unique position in the high-frequency substrate landscape. Its defining characteristic — adjustable Dk from 3 to 25 without glass fiber, in a machinable copper-clad format — solves a problem no other single substrate family addresses: giving PCB designers access to the miniaturisation power of high-Dk ceramics without the brittleness, vacuum metallisation, and machining limitations of sintered ceramic substrates.
For GPS and Beidou patch antenna designers, Dk 9.6 and 10.2 grades provide the circuit compression needed for compact navigation module designs. For miniaturised filter and diplexer designers targeting L-band and S-band, the Dk 6.15–11 range combined with thick substrate availability (up to 12 mm) enables dielectric resonator and coupled-line designs that are impossible on conventional thin PCB laminates. For missile-borne and fuze electronics, the -100°C lower operating limit and extreme machinability make TP-1/2 the practical substitute for sintered ceramic in environments where ceramic’s brittleness under shock and vibration is a reliability concern.
The honest trade-offs are these: the 150×220 mm panel size limits TP-1/2 to compact designs; multilayer PCB construction is not recommended; and Df performance above 10 GHz trails PTFE-based alternatives. For the specific application space TP-1/2 targets — compact single or double-sided high-Dk substrates for navigation, miniaturised radar, and filter circuits — those trade-offs are entirely acceptable, and the material’s combination of Dk flexibility, machinability, and cost-competitiveness is not replicated by any other PCB-processable substrate available today.
Engineers evaluating TP-1/2 for a GPS module, miniaturised antenna, or compact filter design should work with a fabricator experienced in this specialist thermoplastic material. Wangling PCB supports TP-1/2 fabrication with the specialist process knowledge this unique PPO-ceramic substrate requires.
Inquire: Call 0086-755-23203480, or reach out via the form below/your sales contact to discuss our design, manufacturing, and assembly capabilities.
Quote: Email your PCB files to Sales@pcbsync.com (Preferred for large files) or submit online. We will contact you promptly. Please ensure your email is correct.
Notes: For PCB fabrication, we require PCB design file in Gerber RS-274X format (most preferred), *.PCB/DDB (Protel, inform your program version) format or *.BRD (Eagle) format. For PCB assembly, we require PCB design file in above mentioned format, drilling file and BOM. Click to download BOM template To avoid file missing, please include all files into one folder and compress it into .zip or .rar format.
