论文标题
天线带宽工程通过时变电阻
Antenna bandwidth engineering through time-varying resistance
论文作者
论文摘要
谐振电路的操作带宽受到谐振器的尺寸的限制，该大小称为CHU极限。由于天线带宽与其大小成反比，因此该极限限制了天线的微型化。在这里，我们提出了对电阻元件的缓慢调制，以设计小天线的带宽。电阻的时间调制会导致由调制参数完全控制的虚拟阻抗。我们展示了如何使用虚拟阻抗来优化谐振电路的频率响应，从而同时在多个频率下增强了匹配。我们通过实验验证了所提出的技术，证明了由小天线辐射的宽带调制信号的辐射增强。
Operational bandwidth of resonant circuits is limited by the resonator's size, which is known as the Chu limit. This limit restricts miniaturization of antennas, as the antenna bandwidth is inversely proportional to its size. Here, we propose slow time modulation of resistive elements to engineer bandwidth of small antennas. The temporal modulation of resistance induces virtual impedance that is fully controlled by the modulation parameters. We show how the virtual impedance can be used to optimize the frequency response of a resonant circuit, leading to enhanced matching at multiple frequencies simultaneously. We experimentally verify the proposed technique, demonstrating enhancement of radiation of a broadband modulated signal radiated by a small antenna.
