12-Layer Hybrid PCB with RO4350B and RO3010 Laminates, Nickel-Free Palladium Gold Finish for Microwave & Broadband RF Devices

Printed Circuit Boards are custom-made products; the images and specifications provided are for reference only.

1. Product Overview

This custom 12-layer mixed dielectric RF multilayer PCB adopts a hybrid stackup combining two classic Rogers high-frequency substrates: 4mil RO4350B core for top and bottom outer layers, matched with 5mil, 10mil and 25mil RO3010 dielectric cores in the middle sections, while RO4450F prepreg is applied as bonding material between all layers. RO4350B and RO3010 hybrid PCB board adopts differentiated copper weight configuration: 1oz copper foil for top and bottom outer signal layers, and 0.5oz copper foil for all inner circuit layers to balance fine-line routing capacity and current carrying capacity.

For surface finishing, nickel-free palladium gold plating is adopted without nickel interlayer to deliver superior high-frequency signal performance and stable solderability. RO4350B and RO3010 high-frequency PCB is coated with standard green solder mask with white silk screen legends for clear circuit marking and reliable surface protection. The single unit dimension is 107mm × 91.5mm, with two pieces manufactured on one production panel.

Rogers RO4350B and RO3010 multilayer RF PCB integrates complex multi-group blind hole interconnection architecture to shorten signal transmission paths and reduce high-frequency signal loss. The blind hole types include L1-L2, L2-L5, L2-L6, L2-L8, L1-L9, L10-L12 and L3-L12, which realize flexible cross-layer signal routing for high-density microwave circuit layouts.

2. PCB Basic Specification Table

3. PCB Stackup Structure Description

This 12-layer mixed dielectric stackup uses RO4350B laminate as the top and bottom outer high-frequency cores with 4mil thickness each, while multiple thickness grades of RO3010 (5mil, 10mil, 25mil) are arranged in the middle inner layers to meet customized impedance and isolation requirements. RO4450F prepreg acts as the interlayer bonding medium to connect all core and copper layers.

The topmost and bottommost copper layers are 1oz outer copper, and all inner signal layers are 0.5oz thin copper for high-density fine-line routing. Multiple sets of blind hole structures penetrate different layer combinations to achieve vertical interconnection between non-adjacent layers, effectively optimizing routing space and minimizing transmission distance for high-frequency RF signals. A stackup diagram can be inserted in this section for visual reference.

4. RO4350B Material Introduction

RO4350B laminate belongs to Rogers RO4000 series hydrocarbon ceramic reinforced laminates, which are rigid thermoset substrates distinct from PTFE high-frequency materials. This material is engineered to deliver outstanding high-frequency electrical performance while supporting standard FR-4 mass production processes, balancing premium RF performance and controllable manufacturing costs.

When circuit operating frequency rises above 500MHz, most conventional FR-4 substrates cannot meet low-loss demands, while RO4350B maintains ultra-stable electrical properties across wide frequency bands. It features ultra-low dielectric loss, extremely low temperature coefficient of dielectric constant, and flat Dk performance under varying temperatures and frequencies; optional LoPro foil can further lower signal insertion loss, making it a perfect substrate for broadband RF and microwave circuits.

In terms of thermal and dimensional stability, RO4350B owns a CTE value close to copper, delivering excellent dimensional stability critical for hybrid multi-layer PCB construction. Its low Z-axis thermal expansion guarantees intact plated through holes even under severe thermal shock cycles. With a Tg exceeding 280°C, the material keeps stable expansion characteristics throughout all PCB manufacturing heating processes. Unlike PTFE substrates, RO4350B requires no special sodium etching treatment for vias and fits fully automated copper scrubbing and production equipment.

Rogers RO4350B adopts RoHS-compliant flame retardant formula with UL 94V-0 certification and complies with IPC-4103 standards. It has strong CAF resistance, consistent dielectric tolerance, repeatable impedance control for filter and matching network design, and supports large-volume industrial production with competitive pricing.

5.RO4350B Datasheet

6. RO4350B Application Fields

With comprehensive low-loss electrical performance and excellent manufacturability, Rogers RO4350B high-frequency material is widely applied in various high-frequency commercial and industrial electronic devices. Main application scenarios include cellular base station antennas and power amplifier modules, RF identification tag equipment, automotive radar and precision sensor systems, as well as low-noise block downconverters for satellite direct broadcast receiving systems. It serves as the preferred substrate for broadband microwave circuits, controlled impedance transmission lines and customized RF filter designs.

7. RO3010 Material Introduction

RO3010 is another classic high-frequency hydrocarbon ceramic laminate from Rogers, specially developed for ultra-low loss microwave circuit designs that demand precise dielectric constant control. It matches perfectly with RO4350B and RO4450F prepreg to form hybrid multi-layer RF PCB stackups, which is widely adopted for complex blind hole high-frequency boards. We can learn more technical data and view the RO3010 datasheet via Rogers 50mil RO3010 2-Layer High Frequency PCB for further reference.

Similar to the RO4000 series family, Rogers RO3010 features stable Dk/Df across broadband frequency ranges, low thermal coefficient of dielectric constant and matched copper CTE for superior dimensional stability in mixed dielectric stackups. Its low Z-axis expansion prevents hole cracking and layer delamination during repeated thermal cycling. The material can be processed with standard FR-4 fabrication flows without special PTFE post-treatment, compatible with automated mass production lines. It also provides outstanding CAF resistance and reliable plated through-hole performance under high-temperature processing conditions.

Rogers RO3010 laminate is available in multiple customized thickness specifications including 5mil, 10mil and 25mil, fully meeting the diversified dielectric thickness requirements of multi-layer impedance-controlled RF PCBs.

8. RO3010 Application Fields

Rogers RO3010 is widely used in high-precision microwave and millimeter wave circuit products, often combined with RO4350B to manufacture hybrid multilayer RF PCBs with complex blind hole structures. Typical applications cover automotive radar, base station RF power components, satellite communication receiving equipment, RF sensor modules and broadband matching circuit hardware. For detailed technical parameters and application cases, you can refer to our special RO3010 material introduction article released in April 2026.

9. Summary

This 12-layer hybrid high-frequency PCB integrates RO4350B outer cores, multi-thickness RO3010 middle cores and RO4450F bonding prepreg, adopting 1oz outer / 0.5oz inner copper collocation and nickel-free palladium gold surface treatment. Equipped with multiple groups of cross-layer blind hole interconnection structures, the board realizes compact high-density RF circuit layout and effectively reduces high-frequency signal transmission loss. Supported by the excellent low-loss, thermally stable and dimensionally consistent properties of RO4350B and RO3010 Rogers high-frequency materials, this multilayer PCB delivers stable impedance control and reliable long-term working performance, perfectly matching the production demands of cellular communication base station equipment, automotive radar, satellite receiving devices and other broadband microwave electronic products.