An inductive frequency selective surface for use in secure facilities

Limiting mobile phone usage while maintaining a viable communication link for the emergency services can be crucial for secure facilities such as prisons. This paper presents the design of an inductive frequency selective surface (FSS) with a pass-band operating from 380 to 420 MHz covering the TETRA frequency band used by emergency services in Europe. The FSS is designed to attenuate signals in the mobile cellular frequency bands aiming to inhibit the operation of contraband mobile phones. The paper considers how the optical impact of the design can be reduced, thereby enabling its usage as a window covering, and the subsequent effect on the surface´s band-pass and band-stop performance.