Low loss PCB

Judge by dielectric constant (Dk) and Df value. Low-loss materials have lower Df and stronger Dk stability at high frequencies.

Applications include 5G communications (millimeter wave), satellite communications (Ka band), radar systems (above 30GHz), and high-speed digital circuits (28Gbps+).

Typically 2-5 times higher. For example, FR-4 costs about 100 CNY/m², while Rogers RO4350B ranges from 500-800 CNY/m².

For every 0.001 reduction in Df, the transmission loss of 10GHz signals decreases by approximately 0.5dB/10cm, improving signal integrity.

Rogers RO4350B: -40°C~280°C; Isola 370HR: -55°C~280°C.

Yes, it can achieve complex high-speed circuit design, but interlayer alignment accuracy must be controlled (≤±50μm).

Select based on the characteristic impedance requirements of transmission lines. For example, 50Ω microstrip lines typically use materials with Dk 2.2-3.5.

Yes, moisture absorption increases Dk and Df. It is recommended to bake at 125°C for 4 hours to remove moisture before use.

Most meet the UL94 V-0 standard. Some ceramic-based materials require additional treatment to meet flame retardant requirements.

Control through precise calculation of line width, dielectric thickness, copper foil roughness (Ra≤0.5μm), and optimization with simulation tools.

Avoid right-angle traces (increases reflection by ~10%), control the number of vias (each via introduces ~0.2dB loss), and maintain equal-length traces (deviation <5mil).

Maintain a 3W rule for line spacing (3 times the line width), use ground isolation, and reduce the length of parallel traces.

Use a symmetrical stacking structure with a power-ground layer spacing ≤0.1mm to reduce power noise (suppress EMI by ~20dB).

Yes, but hole wall roughness must be controlled (Ra≤1μm); otherwise, 0.3dB loss per inch of hole wall is added.

Critical. High frequency increases power consumption. Use dielectric materials with thermal conductivity ≥1W/mK.

Use microstrip baluns and LC matching circuits to keep return loss below -20dB (10GHz band).

Yes. Pads should be plated with hard gold (thickness ≥3μm) to prevent oxidation from affecting high-frequency contact performance.

Maintain a 1:1 line width-to-spacing ratio, control impedance at 100Ω±5%, and keep parallelism error <0.1mm.

Use Thevenin or AC termination matching to keep the reflection coefficient below 0.1 (18GHz band).

Requires stricter control of lamination temperature (deviation ±2°C), high-precision drilling (aperture tolerance ±25μm), and uniform electroplating.

Laser drilling (minimum aperture 0.1mm) or CNC drilling (minimum aperture 0.2mm), with control of hole wall roughness.

Improper lamination causes dielectric delamination. Vacuum lamination with pressure controlled at 5-8MPa is recommended.

Use RTF copper foil (Ra≤0.3μm), which reduces loss by 15%-20% compared to ordinary copper foil.

Bake at 150°C for 2 hours after lamination to release stress, with warpage ≤0.7%.

For high frequency, ENIG or immersion silver is recommended to avoid OSP oxidation at high temperatures, which increases loss.

Conventional process: 4mil/4mil; advanced process: 2mil/2mil.

Solder mask Df should be ≤0.02. Excessive thickness increases loss (0.1dB/10cm per 10μm).

Use high-precision LDI exposure machines (alignment accuracy ±25μm) and mechanical positioning pins.

Approximately 10%-15%, mainly due to dielectric delamination and impedance non-compliance.

Use a vector network analyzer (VNA) with microstrip test fixtures, covering the target frequency band.

Single-ended impedance ±10%, differential impedance ±8%, requiring sampling at multiple positions.

Through peel strength testing, requiring a bond strength between copper foil and dielectric layer ≥1.5N/mm.

Use TDR or VNA. Test loss of 10cm transmission line ≤3dB (10GHz).

Perform thermal shock testing (260°C, 10 cycles), requiring no delamination or open circuits.

Radiation emission must comply with EN 55032 Class B, with shielding effectiveness ≥40dB (1GHz).

Through S-parameter testing, requiring insertion loss of a single via ≤0.5dB (15GHz).

Test error ≤±0.05, using calibrated test fixtures and instruments.

Perform damp heat aging testing (85°C/85% RH, 1000 hours), with performance degradation <5%.

Eye diagram test (eye height ≥80%), jitter test (RJ+DJ ≤5% of UI), crosstalk test (near-end crosstalk ≤-30dB).

AAU (Active Antenna Unit), RF front-end modules, requiring low loss in millimeter wave bands (24-40GHz).

Support high-speed interfaces like PCIe 5.0 (32GT/s) and DDR5 (6400Mbps), reducing signal attenuation.

Check material Df, copper foil roughness, via design, and solder mask thickness.

Dielectric thickness deviation, line width processing errors, and uneven lamination pressure causing Dk variation.

Increase thermal vias (diameter ≥0.4mm, spacing ≤1mm) and use thermal gap materials.

Check lamination parameters and material moisture, and avoid high-temperature storage.

Use near-field probe scanning to focus on power layer coupling, via resonance, etc.

Yes, suitable for ADAS millimeter wave radars (77GHz), but must meet AEC-Q200 reliability standards.

Add ground fences (spacing ≤50mil) and cover edges with wave-absorbing materials.

Optimize layer design, use standardized materials, and mass-produce (reducing unit price by ~30%).

Consider high-speed FR-4 materials (e.g., Megtron 6, Df=0.012), reducing costs by ~40%.

Select materials based on actual operating frequency, e.g., medium-loss materials for 2-6GHz.

Material unit price, process complexity (e.g., multi-layer boards, blind/buried vias), and yield rate.

Use panel design, simplify processes (e.g., reduce blind/buried vias), and choose local suppliers.

Imported materials: ~4-6 weeks; domestic alternatives: reduced to 2-3 weeks.

Yes, reduce layer count and use standard material sizes (e.g., 18"×24") to minimize material waste.

Includes material costs, processing costs, and rework fees, accounting for ~15%-20% of total costs.

Cost-effective for low-volume trial production, reducing fixed asset investment by ~60%.

High, requiring special processing; recycling costs account for ~10% of manufacturing costs.

IPC-4101 (material specifications), IEC 61189 (test methods), RoHS 2.0 (environmental requirements).

Submit samples for flammability and electrical performance testing; certification takes ~4-6 weeks.

AEC-Q200 (passive component reliability), ISO 26262 (functional safety).

Must pass MIL-P-55110 (microwave circuit specifications) certification and extreme environment testing.

Must comply with RoHS Directive (restricting 6 hazardous substances like lead and mercury) and REACH regulations.

Conduct EMC and LVD tests; certification takes ~2-3 months.

Comply with ISO 13485 (medical device quality management) and FDA 510(k) certification.

IPC standards are updated every ~3-5 years to adapt to new technologies.

Conduct reliability tests such as salt spray testing (96 hours) and vibration testing (20-2000Hz).

SGS, Intertek, TÜV Rheinland, etc.

Developing towards lower Df (<0.002), higher integration (3D packaging), and flexibility.

AI-aided design optimizes routing (improving efficiency by 40%) and predicts signal integrity issues.

Ceramic matrix composites (Df<0.001) and graphene-reinforced materials will drive performance breakthroughs.

Currently limited by precision (line width ≥ 10 mil), but it is expected to achieve rapid prototyping in the future

Achieve higher integration by embedding chips and passive components, reducing signal transmission loss.

Require extremely low-loss materials (Df<0.0005) and ultra-stable dielectric constants.

Must support terahertz frequency bands (100-300GHz) with Df≤0.0015.

Use water-based etching and lead-free soldering to reduce energy consumption by ~25%.

Realize real-time process parameter monitoring via MES systems, improving yield by 15%.

Exploring the use of smart materials (e.g., shape memory alloys) to repair micro-cracks.

Evaluate process capabilities (minimum line width, layer count), certification, delivery time, and after-sales service.

Rogers, Isola, Panasonic, Taconic.

Shengyi Technology, Huazheng New Materials, Jingangguoji, with obvious cost-performance advantages.

Important; should provide material selection, process guidance, and failure analysis services.

Check production capacity (sq.m/month) and on-time delivery rate (≥95%).

Performance metrics, acceptance criteria, liability for breach, intellectual property ownership, etc.

Must have ISO 9001 certification and review SPC (statistical process control) data.

Specify return/replacement clauses in the contract; claim compensation if the defect rate exceeds 5%.

Obtain price discounts (~5%-10%), priority scheduling, and technical sharing.

Require RoHS test reports and environmental management system certification (ISO 14001).

Use anti-static packaging, avoid extrusion/deformation, and control temperature at 5-35℃.

Dry environment (humidity <40%), temperature 20-25℃, shelf life typically 12 months.

Recommended to use water-based cleaning agents; avoid chlorinated solvents to prevent material corrosion.

Hand over to professional recycling companies to avoid environmental pollution.

Must label material type, version number, manufacturing date, and impedance control range.

Accounts for ~3%-5% of total costs; high-end products require vacuum packaging + desiccants.

Provide special training on material properties, process specifications, and equipment operation (training period ~1 week).

High difficulty; requires specialized tools (e.g., laser rework stations) and prone to damaging the dielectric layer.

Must retain design files, process parameters, test reports, etc., for at least 5 years.