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at 10 GHz), while lowering costs compared to pure Rogers builds. These boards often use 4-layer or 6-layer stack-ups with L1-L2 or L1-L3 blind vias, ideal for 5G, antenna, and radar applications.
Key Features & Advantages
- Optimal Performance/Cost: RO4350B (usually 4–20 mil) is placed on outer layers for RF signals, while FR4 provides a cost-effective, rigid core.
- Blind Via Technology: L1-L2 blind vias (via-in-pad often used) enhance density and reduce via stubs, improving signal integrity.
- Material Compatibility: RO4350B handles like FR4, making it compatible with standard multilayer fabrication processes, including high-Tg FR4 bonding.
- Applications: 5G antennas, radar systems, automotive sensors, and high-power amplifiers.
- Layers 1–2: RO4350B Core (High Frequency).
- Layers 2–5: FR4 Prepreg/Core (Structural Layer).
- Layers 5–6: RO4350B Core (High Frequency) or FR4.
- Vias: Blind Vias L1-L2, L1-L3/L1-L4 (for 6+ layers), and Through-Holes.
- Controlled Depth Drilling: Crucial for precise L1-L2 blind vias.
- Registration: High-precision alignment is required for multilayer hybrid registration, typically conforming to IPC-6012 Class 2/3 standards.
- Warpage Management: Because RO4350B and FR4 have different thermal expansion rates, asymmetrical designs must be carefully managed to limit warpage.
- Surface Finish: Immersion Gold (ENIG) is generally preferred for flat surface planarity, especially with BGA components.
Disclaimer: Performance and manufacturing capabilities vary by fabricator. Always consult your vendor for stack-up validation.
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Web results
Hybrid 4-layer PCB 20 mil RO4350B + FR4 Blind Via
Bicheng PCB
https://www.bichengpcb.com › hybrid-4-layer-pcb-20-m...
Bicheng PCB
https://www.bichengpcb.com › hybrid-4-layer-pcb-20-m...
This 4-Layer RT/duroid 5880 multilayer PCB combines premium materials, precision manufacturing, and optimized design for high-reliability high-frequency/mission ...Read more
Hybrid PCB Mixed Material PWB Built On 10 mil RO4350B+ ...
circuitboardpcbs.com
https://www.circuitboardpcbs.com › sale-11579134-hybr...
circuitboardpcbs.com
https://www.circuitboardpcbs.com › sale-11579134-hybr...
Hybrid PCB Mixed Material PWB Built On 10 mil RO4350B+FR4 With Blind Via ; Place of Origin: China ; Brand Name: Bicheng Enterprise Limited ; Certification: UL.Read more
$2.99 to $8.99
People also ask
What are the disadvantages of using FR4?
Limitations: Despite its advantages, FR-4 falls short in applications requiring high-frequency precision or superior heat management. Its higher dielectric loss is a disadvantage in high-speed circuits where signal integrity cannot afford to weaken.
FR-4 vs. Rogers vs. Aluminum: PCB Material Choice | PCBCart
PCBCart
https://www.pcbcart.com › article › content › fr-4-vs-rog...
PCBCart
https://www.pcbcart.com › article › content › fr-4-vs-rog...
What is a blind via PCB?
Blind vias connect an outer layer of a PCB to one or more inner layers without penetrating the entire board. As the name suggests, these vias are “blind” because they are not visible from the opposite side of the PCB.May 5, 2023
PCB Vias: What Are Blind Vias, Buried Vias, and Micro Vias? - Autodesk
Autodesk
https://www.autodesk.com › products › fusion-360 › blog
Autodesk
https://www.autodesk.com › products › fusion-360 › blog
Web results
10 layer RF PCB with RO4350B+FR4
stormcircuit.com
https://www.stormcircuit.com › productinfo
stormcircuit.com
https://www.stormcircuit.com › productinfo
Storm Circuit offers quick-turn PCB prototypes in five days for Double-Sided PCB. Express orders will be shipped out in 3 days for 2 layer board, even 48 hours.Read more
Rogers PCB
Sierra Circuits
https://www.protoexpress.com › rogers-pcb
Sierra Circuits
https://www.protoexpress.com › rogers-pcb
Rogers PCBs offer superior dielectric constant are generally used in high-speed, commercial microwave, and radio frequency applications.
6-Layer PCB with RO4350B and High Tg FR-4 (S1000-2M)
LinkedIn · Sally Mao
6 months ago
LinkedIn · Sally Mao
6 months ago
Blind vias (L1-L2) enable dense circuit integration, reducing board size without sacrificing functionality. Disadvantages. High Manufacturing ...Read more
Hybrid 10 Layer PCB by RO4350b+Fr4 with Blind Via ...
Made-in-China.com
https://abiscircuits.en.made-in-china.com › product › C...
Made-in-China.com
https://abiscircuits.en.made-in-china.com › product › C...
Printed Circuit Boards adhere to IPC Class 2 & 3 international PCB standard. 5. Quantities range from prototype to medium&big batch production. 6.100% E-Test.Read more
· Review by MIC_BUYER
Rogers RO4350B + FR4 Mixed Delectrics PCB
ipcb.com
https://www.ipcb.com › mixerpcb
ipcb.com
https://www.ipcb.com › mixerpcb
Rogers RO4350B + FR4 Mixed Delectrics PCB ; Finished Thickness · 1.2MM ; Copper Thickness · 1OZ ; Dielectric Thickness · 0.508mm ; Thermal Conductivity · 0.69w/m.k.Read more
Rogers RO4350B vs. FR4: Which PCB Material is Right for ...
HUIHE Circuits
https://www.hhcircuits.com › Posts › Uncategorized
HUIHE Circuits
https://www.hhcircuits.com › Posts › Uncategorized
Mar 25, 2025 — Rogers FR4 is a cost-effective laminate used in general-purpose PCBs. It offers good mechanical strength, electrical insulation, and is widely ...Read more
Ordering a 4-Layer PCB With Blind Vias
Reddit · r/PrintedCircuitBoard
8 comments · 5 months ago
Reddit · r/PrintedCircuitBoard
8 comments · 5 months ago
A four layer board with blind vias isn't a good/efficient build. A six layer would be better. A standard four layer build has a single double ...Read more
Rogers PCB vs FR4 PCB: A Complete Comparison Guide ...
pcbjust.com
https://pcbjust.com › Blog
pcbjust.com
https://pcbjust.com › Blog
Dec 16, 2025 — The key is using compatible materials and a controlled lamination process. For example, Rogers RO4350B laminates well with certain FR4 grades ...Read more