Hybrid RF High Frequency 6-Layer PCB Built on 10mil (0.254mm) RO4350B and FR-4 with Blind Via

(Printed circuit boards are custom-made products; the images and parameters shown are for reference only)

Introduction

Hello Everyone,
Warm greetings!
Today, we are discussing a 6-layer hybrid PCB constructed with RO4350B and FR-4. Let's begin with the first design.

This PCB is designed for radar antenna applications. It features two cores of RO4350B on the top and bottom sides, with plated through holes connecting each layer. The stack-up reveals that each dielectric material exceeds 0.2mm in thickness, resulting in an overall PCB thickness of 1.9mm. The pads and holes are finished with immersion gold. These boards are manufactured according to IPC 6012 Class 2 standards using the supplied Gerber data. Each shipment contains 25 panels.

Now, let's look at the second design.

This model is more complex than the first. It maintains the 10mil RO4350B core but incorporates three types of blind vias. The specifications are as follows:

Base Material: RO4350B 10mil + FR-4
Layer Count: 6 layers
Via Types: Blind via L1-L2, L1-L3, L1-L4
Format: 82mm x 95mm = 1 type = 1 piece
Surface Finish: Immersion gold
Copper Weight: Outer Layer 35 μm / Inner Layer 35 μm
Solder Mask / Legend: None
Final PCB Height: 1.4mm
Standard: IPC 6012 Class 2
Packing: 20 panels are packed for shipment.
Lead Time: 20 working days
Shelf Life: 6 months

There is a similar product with inner layers using half-ounce copper, resulting in a finished PCB thickness of 1.0mm. Below are the stack-up and micro-section images.

Advantages of RO4350B Hybrid PCBs:

1.Enhanced Signal Integrity: Improved performance compared to all-FR4 stack-ups.
2.Cost Efficiency: Reduced costs compared to all low-loss material stack-ups.
3.Pre-production Engineering Design: Prevents potential issues during pre-production.
4.Certification: Manufactured in an ISO9000, ISO14001, IATF16949, and UL certified facility.
5.Standards Compliance: IPC Class 2 / IPC Class 3 compliant.

Applications

The applications for this technology are extensive, including radar data acquisition converters, microstrip antennas, tower-mounted boosters, modular oscilloscopes, attenuators, and 5G antennas.

Thank you for reading. Feel free to contact us for your RF PCB inquiries.

Appendix: PCB Data Sheet