Modifications of the geometry of a folded dipole antenna operating in the infrared were studied with the objective to increase the antenna input impedance. These modified folded dipoles were designed and optimized using numerical simulations. Candidate antennas were fabricated, and input impedance was measured experimentally using scattering-scanning near-field optical microscopy. Numerical and experimental results confirm that the choice of an appropriate antenna geometry leads to an input impedance of 1 kΩ or above. With this impedance, the modified folded dipole antenna could be implemented as a solution for the impedance mismatch challenge that arises in antenna-coupled infrared detectors.

为了增加天线输入阻抗，研究了在红外下工作的折叠偶极天线的几何形状的修改。这些改进的折叠偶极子是使用数值模拟进行设计和优化的。制造了候选天线，并使用散射扫描近场光学显微镜通过实验测量了输入阻抗。数值和实验结果证实，选择合适的天线几何形状会导致输入阻抗为1kΩ或更高。有了这个阻抗，可以将改进的折叠偶极天线实现为解决天线耦合红外探测器中出现的阻抗不匹配挑战的解决方案。