研究目的
Designing a miniaturized printed inverted-F antenna (PIFA) embedded on the circuit board of a LoRa sensor node for IoT applications, focusing on reducing operating frequency and broadening the bandwidth by cutting slots on the ground.
研究成果
The proposed miniaturized PIFA achieves a VSWR < 3 bandwidth from 402.4 MHz to 441.6 MHz and a realized gain higher than -6 dBi over the LoRa operating band, demonstrating omnidirectional radiation patterns suitable for IoT applications.
研究不足
The design is constrained by the limited space on the PCB for antenna deployment, requiring innovative approaches to achieve miniaturization and bandwidth enhancement without compromising performance.
1：Experimental Design and Method Selection:
The study adopts a PIFA structure as the basic operating element, with slots cut on the ground to reduce resonant frequency and create another resonance for bandwidth enhancement.
2：Sample Selection and Data Sources:
The antenna is designed on a
3：6 mm-thick FR4 PCB with dimensions of 125mm × 103mm × 6mm. List of Experimental Equipment and Materials:
The design utilizes FR4 substrate and involves simulation and optimization using CST Microwave Studio.
4：Experimental Procedures and Operational Workflow:
The antenna design involves cutting slots on the ground to adjust resonance and combining two resonances to achieve the desired bandwidth.
5：Data Analysis Methods:
The performance is evaluated based on reflection coefficients, VSWR, and realized gain over the operating frequency band.
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