A new type of three-dimensional (3D) Frequency Selective Surfaces (FSS) applied to passive sensing in Structural Health Monitoring (SHM) is presented. Such passive FSS sensors are proposed as an alternative to conventional sensors to eliminate the need of DC/AC power. Moreover, these FSSs are modified in a 3D form to feature enhanced performance compared to conventional FSSs and sensors. More specifically, the proposed 3D FSS is able to control its sensitivity |S21| in either TE or TM incident waves. In this project, incident angle characteristics are evaluated for SHM applications to obtain angular responses of up to 80 degrees. The resonant behavior of the TE-incident wave is shown to be sensitive towards the incident angle and is suitable to be used for monitoring any building tilting and damage. This is due to the significant 3D length changes of the conductor elements. Meanwhile, the TM-incident wave is found to be insensitive towards the incident angle.
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