研究目的
To design a planar ultrathin electronically steerable parasitic array radiator (ESPAR) with compact size, low profile, and electronically beam-switching capability for applications in wireless communications.
研究成果
The proposed planar ultrathin small CD-ESPAR possesses more compact size, larger bandwidth, and lower profile while maintaining beam-switching capability and full azimuth plane coverage, making it suitable for applications in wireless communications.
研究不足
The asymmetric structure of the proposed antenna results in differences in performance when different diodes are turned ON. The actual overall size and height of the antenna may be larger when considering the ground planes used in conventional ESPARs.
1：Experimental Design and Method Selection:
Theoretical analysis of the electric fields of orthogonally crossed dipoles in phase quadrature was conducted to design a planar crossed dipole ESPAR (CD-ESPAR). A simple but effective impedance matching method was also proposed and analyzed.
2：Sample Selection and Data Sources:
A prototype resonating at 2.3 GHz was designed, fabricated, and measured to verify the concepts.
3：3 GHz was designed, fabricated, and measured to verify the concepts.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The antenna was etched on both sides of an h = 0.813 mm thick Rogers RO4003C substrate. Two Skyworks SMP1345-079LF PIN diodes were used in the prototype.
4：813 mm thick Rogers RO4003C substrate. Two Skyworks SMP1345-079LF PIN diodes were used in the prototype.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The prototype was fabricated and measured to evaluate its performance, including reflection coefficient and radiation patterns.
5：Data Analysis Methods:
The measured results were analyzed to determine the antenna's impedance bandwidth and beam-switching capability.
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