研究目的
To design a compact dual-band circularly polarized microstrip antenna over a reactive impedance surface for size miniaturization and improved performance in L and S bands.
研究成果
The proposed compact dual-band CP antenna over RIS achieves size miniaturization and independent feed ports for two frequency bands, with measured gains of 1.9 dBic and 1.94 dBic. The design is effective for applications requiring compact dual-band CP antennas, and future work could focus on further size reduction and bandwidth enhancement.
研究不足
The measured center frequencies show slight shifts compared to simulations, attributed to inaccuracies in the relative permittivity of the FR4 substrate. The antenna has narrow axial ratio bandwidths (0.9% and 1.1%), which may limit its application in broader bandwidth scenarios.
1：Experimental Design and Method Selection:
The antenna design involves stacking a square ring slotted truncated corner square patch (SRSTCSP) and a truncated corner square patch (TCSP) over a reactive impedance surface (RIS) to achieve circular polarization and compact size. The RIS is used for size miniaturization and bandwidth enhancement. Two probes are used for separate feeding of the patches via grounded coplanar waveguides (GCPW).
2：Sample Selection and Data Sources:
A prototype antenna is fabricated and measured. Simulations are performed to compare with measured results.
3：List of Experimental Equipment and Materials:
FR4 substrate (εr = 4.4, tan δ = 0.02), Taconic CER-10 substrate (εr = 10.2, tan δ = 0.002), metal patches for RIS and radiators, probes, and GCPW feed structures.
4：4, tan δ = 02), Taconic CER-10 substrate (εr = 2, tan δ = 002), metal patches for RIS and radiators, probes, and GCPW feed structures.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The antenna structure is built with four dielectric layers. The RIS unit cell is designed and optimized. The SRSTCSP and TCSP are fabricated with specific dimensions. Measurements include return loss, axial ratio, gain, and radiation patterns using appropriate equipment.
5：Data Analysis Methods:
Simulated and measured data are compared. Parameters such as bandwidth, gain, and radiation patterns are analyzed to evaluate performance.
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