If you work on RF antenna hardware, you have likely run across RO4725JXR high‑frequency circuit boards. This antenna‑grade hydrocarbon‑ceramic laminate sits inside many modern 5G base station antennas, and it solves real pain points engineers face with older PTFE‑based substratesRogers Cor.
Many RF designers pick RO4725JXR PCB for its stable dielectric performance. Its nominal Dk hits 2.55 with tight tolerance ±0.05 at 10 GHz. Dk shift stays small as temperatures swing, thanks to low TCDk of +34 ppm/°C. That consistency matters when you need repeatable impedance control across production batches.
Signal loss stays very low on RO4725JXR printed circuit boards. The dissipation factor Df reads 0.0022 at 2.5 GHz when paired with LoPro reverse‑treated copper foil. Less insertion loss means better antenna gain and higher working efficiency for cellular antenna arrays.
One standout strength is its low passive intermodulation performance. Well‑fabricated RO4725JXR antenna PCB can reach typical‑166 dBc PIM rating. For public telecom infrastructure, poor PIM creates signal noise that degrades whole‑network performance. This material keeps intermod distortion well under control for high‑power antenna systems.
Mechanical and thermal properties add extra reliability. Glass transition temperature Tg exceeds 280 °C, so it holds up through lead‑free high‑temperature soldering cycles. Z‑axis CTE sits around 25.6 ppm/°C, closely matched to copper. Plated through holes suffer far fewer cracking failures during thermal cycling, a common failure mode for high‑frequency PCBs deployed outdoorsMade-in-Ch….
Unlike most PTFE microwave substrates, RO4725JXR laminate works with standard FR‑4 PCB fabrication workflows. Shops do not need special modified etching or lamination equipment. It cuts down lead time and overall board cost for high‑volume antenna projects. The material is roughly 30 % lighter than comparable PTFE‑glass cloth materials too, helpful for weight‑limited tower‑mount antenna assemblies.
You will commonly see custom RO4725JXR circuit boards built as double‑layer or multi‑layer structures. Fabricators can apply immersion gold, OSP, immersion silver or other surface finishes according to assembly needs. Standard dielectric thickness options include 30.7 mil and 60.7 mil core materials for different antenna impedance requirements.
What projects fit this material best? Cellular base station antenna PCB, 5G remote radio unit circuits, distributed antenna system boards, and general high‑performance RF antenna hardware. It is less ideal for millimeter‑wave designs pushing far above 20 GHz, where you would select other Rogers high‑frequency materials instead.
To wrap it up, Rogers RO4725JXR high frequency PCB balances solid RF electrical specs, good PIM, manufacturability and competitive cost. It remains a practical go‑to substrate whenever you build antenna hardware that cannot afford random performance drift or field reliability issues.
RO4725JXR™ Antenna Grade Hydrocarbon-Ceramic Woven Glass Laminate
| Property | RO4725JXR Value | Direction | Units | Condition | Test Method |
|---|---|---|---|---|---|
| Dielectric Constant, εr (Process) | 2.55 ±0.05 | Z | — | 10 GHz, 23°C | IPC-TM-650 2.5.5.5 |
| Dielectric Constant, εr (Design) | 2.64 | Z | — | 1.7 GHz – 5 GHz | Differential Phase Length Method |
| 損耗因數 (Df) | 0.0022 | Z | — | 2.5 GHz, 23°C | IPC-TM-650 2.5.5.5 |
| 損耗因數 (Df) | 0.0026 | Z | — | 10 GHz, 23°C | IPC-TM-650 2.5.5.5 |
| Thermal Coefficient of εr (TCDk) | +34 | Z | ppm/°C | -50°C to +150°C | IPC-TM-650 2.5.5.5 |
| 體積電阻率 | 2.16×10⁸ | — | MΩ·cm | Condition A, 0.030” core | IPC-TM-650 2.5.17.1 |
| 表面電阻率 | 4.8×10⁷ | — | MΩ | Condition A, 0.030” core | IPC-TM-650 2.5.17.1 |
| Dielectric Strength | 630 | — | V/mil | 0.030” thickness | IPC-TM-650 2.5.6.2 |
| Passive Intermodulation (PIM) | ≤ -166 | — | dBc | 1900 MHz, 43 dBm, 0.060” | Rogers Internal Method |
