Rogers RO4725JXR 2-Layer 60.7mil High-Frequency Antenna PCB with Immersion Gold
1.Introduction of RO4725JXR
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. RO4725JXR antenna grade laminates are fully compatible with conventional FR-4 and high temperature lead-free solder processing. These materials do not require the special treatment needed on traditional PTFE-based laminates for plated through-hole preparation. RO4725JXR laminates are an affordable alternative to conventional PTFE-based antenna materials, allowing for designers to optimize cost and performance.
RO4725JXR laminates have the mechanical and electrical properties that antenna designers need. The laminates have a dielectric constant (Dk) of 2.55 and a loss tangent (Df) of 0.0022 measured at 2.5 GHz when using LoPro Reverse Treated EDC Foil. These values allow antenna designers to realize substantial gain values while minimizing signal loss. Materials are available with a demonstrated low PIM performance, with values better than -160 dBc (43dBm 1,900MHz signal).
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 with X axis of 13.9 ppm/°C, Y axis of 19 ppm/°C, Z axis of 25.6 ppm/°C
High Tg value of >280 °C
Perfect PIM value of -166 dBc
3.Benefits
Low loss dielectric with low profile foil
Low insertion loss
Dk matched to standard PTFE based antenna offerings
Reduced passive inter-modulation (PIM)
Consistent circuit performance
4.PCB Construction Details
| Specification | Value |
|---|---|
| Base Material | RO4725JXR |
| Layer Count | 2-layer |
| Board Dimensions | 115.1mm × 66.3mm (±0.15mm) |
| Minimum Trace/Space | 5/6 mils |
| Minimum Hole Size | 0.3mm |
| Blind Vias | No |
| Finished Board Thickness | 1.62mm |
| Finished Cu Weight (Outer Layers) | 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% prior to shipment |
5.PCB Stackup (2-Layer Rigid Structure)
Copper layer 1 – 35 µm
Rogers RO4725JXR Core – 1.542 mm (60.7mil)
Copper layer 2 – 35 µm
6.PCB Statistics:
Components: 25
Total Pads: 150
Thru Hole Pads: 92
Top SMT Pads: 58
Bottom SMT Pads: 0
Vias: 131
Nets: 2
7.Typical Applications
Cellular Base Station Antennas
8.Quality Assurance
Artwork Format: Gerber RS-274-X
Quality Standard: IPC-Class-2
Availability: Worldwide
