Custom Rogers mmWave phased array high frequency PCB for 24GHz,28GHz,60GHz,77GHz radar. Controlled impedance, low loss, no solder mask on antenna radiator, LDI precision fabrication.
Key Benefits
✅ Ultra-low loss Rogers substrate (RT5880 / RO3003 / RO4350B), stable Dk across mmWave frequency band
✅ Tight controlled impedance (50Ω standard, ±3% / ±5% tolerance) for antenna feed network
✅ No solder mask on antenna radiators, eliminate parasitic dielectric interference
✅ High phase matching for multi-channel feed lines, guarantee accurate beam steering
✅ Fence grounding via design, improve channel isolation & suppress unwanted coupling
✅ Low-profile copper foil option, minimize conductor loss at millimeter wave
✅ Low water absorption & low thermal drift, reliable performance in harsh outdoor/automotive environments
✅ LDI laser direct imaging, fine trace & strict length matching for phased array requirement
Specifications
| Item | Specification |
|---|---|
| Product Name | Millimeter Wave Phased Array RF High Frequency PCB |
| Base Material | Rogers RT/duroid 5880 / RO3003 / RO4350B |
| Dielectric Constant (Dk) | 2.20 @10GHz (RT5880) |
| Dissipation Factor (Df) | 0.0009 @10GHz (RT5880) |
| Standard Impedance | 50Ω Microstrip, ±3% / ±5% tolerance |
| Board Thickness | 0.254mm / 0.508mm / 0.787mm / 1.524mm |
| Copper Foil | Low Profile Copper / Reverse Treat Foil (RTF), 0.5oz / 1oz |
| Surface Finish | ENIG / Hard Gold Plating; Antenna area solder mask free |
| Typical Operating Band | 24GHz, 28GHz, 60GHz, 77GHz |
| Layer Stack | 2-layer standard; Hybrid Rogers+FR4 stack available |
| Fabrication Tolerance | Trace width ±0.02mm, Outline ±0.05mm |
RF & Impedance Performance
✅ Impedance Characteristice
The feed network adopts 50Ω microstrip controlled impedance, the most common standard for RF radar and antenna systems. At mmWave frequencies, impedance is extremely sensitive to Dk fluctuation, copper roughness and trace dimension. We compensate stack-up and trace width according to actual material batch test data, to keep impedance stable over the working bandwidth. Custom impedance such as 70.7Ω,100Ω differential line is supported for power divider & coupler circuits.
✅ Signal Performance Features
- Low Insertion Loss: Low Df Rogers material greatly reduces dielectric attenuation, critical for long feedlines in millimeter wave.
- Phase Consistency: Multi-channel feed traces are length-matched precisely. Good phase balance ensures predictable beam forming & scanning for phased array antennas.
- VSWR & Return Loss: Typical port VSWR ≤1.5:1, return loss better than -15dB after impedance tuning.
- High Isolation: Dense grounding via fence along array edges acts as an electrical wall, suppress crosstalk and mutual coupling between adjacent antenna elements, channel isolation >20dB.
- Low Dispersion: Dk stays consistent across wide frequency range, less frequency drift for broadband radar design.
Manufacturing Advantages
We are specialized in high-frequency microwave PCB fabrication, with mature process for PTFE-based Rogers boards.
- Solder mask-free antenna window process: Antenna radiation pads are exposed bare copper. Solder mask will shift resonant frequency and raise loss, which is forbidden for mmWave antenna.
- LDI Laser Direct Imaging: For ultra-fine traces required by high-frequency microstrip lines, stable line width control for impedance consistency.
- PTFE dedicated drilling & routing: Special cutting tools and parameter to avoid substrate smearing, tearing and hole roughness.
- Panel shrinkage & expansion compensation: Pre-compensate material dimensional change to guarantee critical trace length matching for phased array.
- Rf impedance coupon test: Impedance test coupons produced together with panels for verification before shipment.
- Hybrid lamination service: Combine Rogers high-frequency core with FR4 for cost optimization when the project budget is limited.
Application Scenarios
- 77GHz Automotive Millimeter Wave Radar
- 24GHz Short-range Security Radar
- 5G / 6G Phased Array Communication Antenna
- Imaging Radar & Sensing Radar Module
- Microwave RF Transceiver Front-end
