研究目的
To analyze and design a gain-enhanced tri-band microstrip antenna by manipulating higher-order modes' equivalent magnetic currents to convert radiation patterns from conical to broadside, thereby increasing gains and improving performance.
研究成果
The study successfully demonstrated that manipulating EMCS can convert higher-order modes' radiation patterns from conical to broadside, enhancing gains. The designed tri-band antenna achieved gains around 10 dBi at 3.9, 4.95, and 5.9 GHz with consistent patterns and polarization. Future work could involve broadening bandwidths using thicker substrates and applying the theory to other antenna designs.
研究不足
The antenna has narrow bandwidths (0.8% to 1.3%), which may limit its application in broadband systems. Fabrication errors can cause frequency shifts, and the efficiency of the first band is lower due to measurement and fabrication inaccuracies. The design is specific to higher-order modes in square patches and may not generalize to other antenna types.
1：Experimental Design and Method Selection:
The study uses theoretical analysis based on the cavity model to manipulate equivalent magnetic currents (EMCS) for pattern conversion. Simulations are conducted using HFSS software to design and optimize the antenna.
2：Sample Selection and Data Sources:
A microstrip square antenna is designed and fabricated on a Rogers5880 substrate. Data is sourced from simulations and measurements of the fabricated antenna.
3：List of Experimental Equipment and Materials:
Rogers5880 substrate (dielectric constant εr = 2.2, height 1.58 mm), coaxial cable for feeding, shorting pins, slots, Agilent Vector Network Analyzer N9917A for S11 measurements, StarLab SATIMO of MVG for radiation pattern and gain measurements.
4：2, height 58 mm), coaxial cable for feeding, shorting pins, slots, Agilent Vector Network Analyzer N9917A for S11 measurements, StarLab SATIMO of MVG for radiation pattern and gain measurements.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Design the antenna with one-port differential feeding, load shorting pins and slots to control EMCS. Simulate using HFSS, fabricate the antenna, measure S11 with the network analyzer, and test radiation patterns and gains with the StarLab system.
5：Data Analysis Methods:
Analyze S11, radiation patterns, gains, and efficiency from simulated and measured data. Use theoretical calculations for directivity and EMCS relationships.
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