研究目的
To extend the tunneling effect of epsilon-near-zero (ENZ) narrow channel for matching two microstrip lines with different impedance characteristics, providing a compact and efficient alternative to conventional methods.
研究成果
The ENZ-based impedance matching circuit successfully matches microstrip lines with different impedances (50? to 100? and 150?) at a plasma frequency of 7.5 GHz, achieving a bandwidth of 8%-15% and low insertion loss (<0.2 dB). Application to a microstrip patch antenna demonstrates practical utility with good radiation efficiency and gain. The compact size makes it suitable for integrated circuits and antenna arrays, though manufacturing tolerances need consideration for precise frequency alignment.
研究不足
The bandwidth is limited to 8%-15%, dependent on the ENZ metamaterial properties. Fabrication tolerances, such as substrate permittivity variations, can cause frequency shifts. The use of SMA connectors introduces insertion losses, and the method may be challenging for very high-frequency applications without further optimization.
1：Experimental Design and Method Selection:
The study uses ENZ metamaterials to design a compact impedance matching circuit. A rectangular waveguide operating in TE10 mode is implemented via substrate integrated waveguide (SIW) technology to realize the ENZ medium. Theoretical models include equations for reflection coefficient and effective permittivity.
2：Sample Selection and Data Sources:
Microstrip lines with impedances of 50?, 100?, and 150? are used. Simulations are performed using CST Microwave Studio, and measurements are conducted with an Agilent N5230A network analyzer.
3：List of Experimental Equipment and Materials:
Substrates include RT-Duroid 5870 (εr=
4：33, thickness=68 mm) and Rogers RO4003C (εr=38, thickness=508 mm). Metallic vias and walls are used for SIW implementation. SMA connectors are employed for measurements. Experimental Procedures and Operational Workflow:
Design parameters are calculated based on plasma frequency. Circuits are fabricated, and S-parameters are measured after de-embedding and normalization. A microstrip patch antenna is also integrated and tested.
5：Data Analysis Methods:
S-parameters are analyzed to assess matching performance. Circuit modeling with lumped elements (e.g., capacitors, inductors) is used for validation. Bandwidth is evaluated based on |S11| and |S22| < -10 dB criteria.
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