研究目的
To evaluate the phased array antenna system in the 90-GHz band using fiber-dispersion-based true time delay for beam steering.
研究成果
90-GHz-band beam steering is successfully demonstrated using the fiber chromatic dispersion effect, with a beam steering range of 5 degrees. The system shows potential for applications requiring fixed wireless system alignment.
研究不足
The recon?guration time of the WSS limits the beam steering speed, making the system suitable for automatic alignment of the antenna facing in the ?xed wireless system rather than quick beam steering.
1：Experimental Design and Method Selection:
The study configures a four-elements phased array antenna system using wavelength division multiplexing (WDM) technique for adding delays in multiple input signals.
2：Sample Selection and Data Sources:
Four wavelength tunable laser diodes (TLDs) are used as lightwave seed sources with different wavelengths.
3：List of Experimental Equipment and Materials:
Includes TLDs, an optical Mach–Zehnder interferometer-type modulator, erbium-doped fiber amplifier, wavelength selective switch (WSS), photodiodes (PDs), and a pyramidal horn antenna.
4：Experimental Procedures and Operational Workflow:
The modulated signals are passed through a dispersion-based WDM delay controller, split by WSS, converted into millimeter-wave signals by PDs, and irradiated into the air.
5：Data Analysis Methods:
The antenna pattern is evaluated using a harmonic mixer connected to an electrical spectrum analyzer.
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wavelength tunable laser diodes
TLD
Used as a lightwave seed source with different wavelengths.
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optical Mach–Zehnder interferometer-type modulator
Used as a two-tone optical generator.
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erbium-doped fiber amplifier
Used in the dispersion-based WDM delay controller for amplifying signals.
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wavelength selective switch
WSS
Splits the WDM signal into four output ports with an optical filter feature.
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photodiodes
PD
Converts the optical two-tone signal with the delays into a 96-GHz millimeter-wave signal.
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pyramidal horn antenna
Irradiates directive millimeter-wave signal into the air.
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harmonic mixer
HM
Used as a receiver with a horn antenna to evaluate the antenna pattern.
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electrical spectrum analyzer
ESA
Used to analyze the received signals.
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