RO4725JXR 2-Layer 0.8mm Immersion Gold PCB for Antenna Applications
1.Introduction
Rogers RO4725JXR Hydrocarbon / Ceramic / Woven Glass antenna grade laminates are a reliable, low-cost alternative to conventional PTFE-based laminates. The resin systems of RO4725JXR dielectric materials provide the necessary properties for ideal antenna performance. These laminates are fully compatible with conventional FR-4 and high-temperature lead-free solder processing and do not require special treatment for plated through-hole preparation. RO4725JXR materials offer an affordable solution for designers seeking to optimize both cost and performance in high-frequency applications.
2.Key Features
Dielectric Constant of DK 2.55 +/-0.05 at 10GHz/23°C
Dissipation Factor of 0.0026 at 10GHz/23°C and 0.0022 at 2.5GHz
Excellent Thermal Coefficient of Dielectric Constant: +34 ppm/°C
CTE matched to copper: X-axis 13.9 ppm/°C, Y-axis 19 ppm/°C, Z-axis 25.6 ppm/°C
High Tg value >280°C
Perfect PIM value: -166 dBc
3.Benefits
Low loss dielectric with low profile foil
Low insertion loss
Dk matched to standard PTFE-based antenna materials
Reduced passive inter-modulation (PIM)
Consistent circuit performance
4.PCB Construction Details
| Parameter | Specification |
|---|---|
| Base Material | RO4725JXR |
| Layer Count | 2-layer |
| Board Dimensions | 53mm x 79mm (±0.15mm) |
| Minimum Trace/Space | 4/7 mils |
| Minimum Hole Size | 0.3mm |
| Blind Vias | No |
| Finished Thickness | 0.8mm |
| Cu Weight (Outer) | 1oz (1.4 mils) |
| Via Plating Thickness | 20 μm |
| Surface Finish | Immersion Gold |
| Top Silkscreen | No |
| Bottom Silkscreen | No |
| Top Solder Mask | No |
| Bottom Solder Mask | No |
| Electrical Test | 100% tested prior to shipment |
5.PCB Stackup (2-Layer Rigid Structure)
Copper layer 1 - 35 μm
RO4725JXR Core - 0.78 mm (30.7mil)
Copper layer 2 - 35 μm
6.PCB Statistics:
Components: 6
Total Pads: 39
Thru Hole Pads: 31
Top SMT Pads: 8
SMT Pads: 0
Vias: 20
Nets: 2
7.Typical Applications
Cellular Base Station Antennas
8.Quality Assurance
IPC-Class 2 compliant
100% electrical tested
Global availability
Gerber RS-274X support