研究目的
To develop a fast and accurate closed-form model for predicting key parameters of coax-fed rectangular patch antennas, including resonant frequency, quality factor, bandwidth, gain, and input impedance, as functions of aspect ratio, feed location, and substrate electrical parameters, for use in CAD programs.
研究成果
The improved closed-form model accurately predicts resonant frequency, quality factor, bandwidth, gain, and input impedance for rectangular patch antennas with aspect ratios from 0.4 to 2.0, substrate thicknesses up to d/λg=0.23, and permittivities from 2.2 to 10.2. It shows close agreement with experimental and simulation results, is simple and fast for CAD applications, and can be extended to other regular patch shapes and substrates. Future work could generalize it for defected ground planes and improve accuracy by considering leaky wave modes.
研究不足
The model is not valid for inverted geometries and may have inaccuracies near the edge of the patch due to inherent limitations of the cavity model. It does not account for leaky wave modes, and surface wave loss is not incorporated, though the model performs well without it for substrates up to d/λg=0.25.
1：Experimental Design and Method Selection:
The study employs an improved closed-form model based on cavity model and single resonant parallel R-L-C circuit analysis. Theoretical models include expressions for resonant frequency, input impedance, quality factors, bandwidth, and gain.
2：Sample Selection and Data Sources:
Prototype antennas are etched on substrates like Taconic (εr1=
3：33, d1=7875 mm, tanδ1=001), Rogers (εr1=4, d1=58 mm, tanδ1=0022), and Arlon (εr1=8, d1=63 mm, tanδ1=0004). Data from experiments and literature are used for validation. List of Experimental Equipment and Materials:
Network Analyzer Agilent E5071B, substrates (Taconic, Rogers, Arlon), coaxial probes (diameter g=
4：24 mm or 27 mm), and etching materials. Experimental Procedures and Operational Workflow:
Antennas are designed and fabricated with varying aspect ratios, feed locations, and substrate parameters. Measurements are performed using the network analyzer to obtain input impedance, resonant frequency, etc. Simulations are conducted using HFSS software.
5：Data Analysis Methods:
Computed values from the model are compared with experimental and simulation results using statistical methods to assess accuracy and agreement.
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