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Anechoic Chamber Testing Process
Precision Measurement & Performance Validation
Test Process

Anechoic chamber testing validates antenna radiation performance and compliance through standardized procedures and precision instruments, offering critical data for product optimization and certification.

Stage 1:
Pre-Testing Preparation
1.1 Requirements Confirmation & Sample Submission

Client Provides:

  • IoT devices, 5G base stations, radar systems, medical equipment
  • Single/multi-band (e.g., 2.4+5 GHz or 28 GHz mmWave)
  • 3 dBi (omni) to 20 dBi (directional)
  • Linear (V/H) or circular polarization (RHCP/LHCP)
  • Max dimensions (e.g., 15×15×5 mm)

Our Prepares:

  • Calibrates test equipment (VNA, signal generator, reference antennas)
  • Validates chamber performance (background noise ≤-50 dBm, reflectivity ≤-40 dB).

Deliverable: Test Plan Document.

    Stage 2:
    Testing Execution
    2.1 Basic Parameter Testing

    Test Item

    Method/Equipment

    Key Metrics

    S-Parameters

    Vector Network Analyzer (Keysight PNA)

    S11 (Return Loss), S21 (Isolation)

    Impedance Matching

    Smith Chart Analysis + TDR

    VSWR ≤2.0

    Frequency Coverage

    Frequency Sweep (0.1 GHz steps)

    -10 dB Bandwidth Coverage

    2.2 Radiation Performance Testing

    Test Item

    Method/Equipment

    Key Metrics

    Radiation Pattern

    Turntable + Standard Gain Horn (ETS-Lindgren)

    H/V-Plane Patterns, 3 dB Beamwidth

    Gain Measurement

    Substitution Method

    Peak/Average Gain (dBi)

    Efficiency Test

    Wheeler Cap/Radiation Integration

    Total Efficiency ≥50%

    Cross-Polarization

    Orthogonal Polarization Switching

    ≥15 dB (Circular Polarization)

    Side-Lobe Suppression

    High-Resolution Angular Scan (1° step)

    Side-Lobe Level ≤-10 dB

    2.3 Environmental Testing (Optional)
    • Thermal Cycling: Pattern stability at -40°C to 85°C.
    • Vibration Test: Post-random vibration (10–2000 Hz) validation.
    • Salt Spray Test: 48-hour exposure for corrosion resistance.
    Stage 3:
    Data Analysis & Reporting
    3.1 Data Processing
    • Pattern Optimization: 3D interpolation using MATLAB/Python.
    • Efficiency Calibration: Loss compensation via integrating sphere data.
    • Compliance Check: FCC Part 15/ETSI EN 300 328 standard alignment.
    3.2 Report Generation
    • Test setup (equipment list, chamber specs).
    • Raw data plots (S-parameters, polar radiation patterns).
    • Pass/Fail summary with improvement recommendations (e.g., bandwidth optimization).
    • Formats: PDF + stamped hard copy.
    Stage 4:
    Post-Testing Support
    4.1 Retesting
    • Free Retest: 1 free retest for failed items (within 30 days).
    • Expedited Service: 24-hour turnaround (+30% fee).
    4.2 Certification Assistance
    • Pre-compliance reports (FCC/CE).
    • Design modification support for certification.

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