Qiao Sun, Nianxi Xu, Haigui Yang, Dongzhi Shan, Yang Tang, Xin Chen, Tongtong Wang, Jinsong Gao, Yu Cai, "Highly efficient optics/microwave beam splitter based on frequency selective surface," Chin. Opt. Lett. 22, 061202 (2024)

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- Chinese Optics Letters
- Vol. 22, Issue 6, 061202 (2024)

Fig. 1. Schematic diagram of the FSS-based optics/microwave beam splitter.

Fig. 2. Schematic diagram illustrating multiple-beam interference. (a) The reflections and refractions of the multiple-beam in the substrate. (b) The simulation transmittance curve of the substrate under oblique incidence angle of 45°.

Fig. 3. Equivalent circuit model diagram of the beam splitter. (a) The beam splitter substrate Model a. (b) The equivalent circuit model corresponding to Model a. (c) The multi-layer bonding beam splitter Model c. (d) The equivalent circuit model corresponding to Model c. (e) The beam splitter Model e with the FSS structure. (f) The equivalent circuit model corresponding to Model e.

Fig. 4. Design results of the optics/microwave beam splitter. (a) The structural parameters of the FSS added onto the interface. (b) The resonance current distribution of the FSS. (c) The simulation results of the TE polarization transmittance in the Ka band for three beam splitter models. (d) The simulation results of the TE polarization transmittance in the microwave frequency band for three beam splitter models.

Fig. 5. Schematic diagram of the optics/microwave beam splitter sample.

Fig. 6. (a) Fabricated optics/microwave beam splitter prototype. (b) The microwave measurement setup.

Fig. 7. (a) The 450–900 nm reflectance measurement result of the sample. (b) The 7.7–10.5 µm reflectance measurement result of the sample. (c) The Ka band transmittance measurement result of the sample and the comparison with the simulation. (d) The microwave working frequency band transmittance measurement result of the sample and the comparison with the simulation.

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