研究目的
Investigating uncertainties affecting millimeter-wave antenna measurements, including misalignment, anechoic environment effectiveness, and probe radiation impact.
研究成果
Misalignment effects are predictable and small (<0.03 dB error) with proper alignment tools. A fully shielded anechoic environment is necessary for accurate measurements, as it significantly reduces unwanted reflections. Probe radiation increases the noise floor by approximately 20 dB, limiting dynamic range for low-gain antennas, with back-probing suggested as a potential mitigation in some cases.
研究不足
The study is limited to frequencies up to 90 GHz and specific antenna types (horn and OEWG). The probe radiation issue lacks a readily available solution, and the effectiveness of absorbers is primarily validated up to 40 GHz, with extrapolation to higher frequencies. The anechoic chamber's modular nature may introduce variability, and the alignment accuracy depends on available camera/laser technology.
1：Experimental Design and Method Selection:
The study uses a designed millimeter-wave anechoic chamber for semi-hemispherical antenna measurements. It involves theoretical models for predicting misalignment effects and FFT transformations for time-domain analysis of reflections.
2：Sample Selection and Data Sources:
Antennas under test include an E-band horn antenna (18mm x 14mm aperture) and an open-ended waveguide (OEWG) antenna (
3：1mm x 5mm aperture). Data is collected through frequency sweeps and angular scans. List of Experimental Equipment and Materials:
A portable millimeter-wave anechoic chamber with probe station, alignment system, sensors for temperature and vibration, digital camera, lasers for alignment, electromagnetic absorbers, metal plate for reflection tests, and probe connections.
4：Experimental Procedures and Operational Workflow:
Alignment is performed using marks and digital camera; angular scans from θ = -90° to 90° with 1° resolution; frequency sweeps from 60 GHz to 90 GHz; FFT applied to transform data to time domain; measurements of S21 parameters and radiation patterns under varying environmental conditions (e.g., with/without absorbers).
5：Data Analysis Methods:
Statistical analysis of gain errors, percent error calculations, and comparison of radiation patterns and received power under different setups.
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