2.5-Dimensional Switchable Frequency Selective Surface Based on Reed Switch

This paper presents a 2.5-dimensional switchable frequency selective surface based on the active device reed switch. This structure uses reed switches instead of PIN diodes to connect the upper and bottom metal patches on the basis of 2.5 dimensions. The structure can control the connection and disconnection of the reed inside the reed switch by controlling whether the external magnetic field is applied or not, thereby controlling the switching of the structural performance. When the external magnetic field is not applied, the internal reed remains disconnected. At this time, the structure has a pass band of 0-3GHz; when a certain strength of the external magnetic field is applied to connect the internal reeds, there will be a stop band ranging from 1.90 GHz to 2.12 GHz, and the center of the stop band is 2.028 GHz. In addition, the structure has good miniaturization performance, and the unit size is only 0.08 λ× 0.08 λ.