研究目的
Designing a low-profile antenna with multi-directional beams for wireless sensor networks to reduce energy consumption and enable multiple links.
研究成果
The proposed low-profile antenna with loop elements achieves a thickness of 3.2 mm and provides four directional beams with average gains of 8.0 dBi (simulated) and 5.6 dBi (measured), making it suitable for reducing energy consumption in wireless sensor networks. Future work includes reducing cross-polarization and improving fabrication to minimize discrepancies.
研究不足
Discrepancies between simulated and measured results (e.g., resonant frequency shift from 6.28 GHz to 6.44 GHz, gain difference of 2.5 dB) due to factors like air gaps in fabrication. Cross-polarization causes energy loss, and radiation is attenuated in some directions.
1：Experimental Design and Method Selection:
The antenna design is based on loop elements and surface wave principles to achieve a low-profile structure with four directional beams. Simulation and measurement methods are used to evaluate performance.
2：Sample Selection and Data Sources:
A fabricated antenna prototype is used for measurements, with simulations conducted using electromagnetic simulation tools.
3：List of Experimental Equipment and Materials:
The antenna consists of two loop elements, a feeding patch, two dielectric substrates (Taconic substrate with dielectric constant εr=2.2 and loss tangent 0.001), and a ground plane. Equipment includes simulation software and measurement tools for S11 and radiation patterns.
4：2 and loss tangent 001), and a ground plane. Equipment includes simulation software and measurement tools for S11 and radiation patterns.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The antenna is designed with specific dimensions (e.g., thickness 3.2 mm, substrate radius 34.5 mm, loop width 1 mm, long side length 66.79 mm, short side length 11 mm). It is fabricated and measured for S11 characteristics and radiation patterns at resonant frequencies.
5：2 mm, substrate radius 5 mm, loop width 1 mm, long side length 79 mm, short side length 11 mm). It is fabricated and measured for S11 characteristics and radiation patterns at resonant frequencies.
Data Analysis Methods:
5. Data Analysis Methods: Simulated and measured data are compared for resonant frequency, S11, gain, and radiation patterns to assess performance discrepancies.
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