Abstract
Conventional planar frequency selective surfaces (FSSs) are characterized in the far-field region and they are sensitive to the incidence angle of impinging waves. In this paper, a spherical dome FSS is presented, aiming to provide improved angular stable bandpass filtering performance as compared to its planar counterpart when the FSS is placed in the near-field region of an antenna source. A comparison between the conformal FSS and a finite planar FSS is presented through simulations at the frequency range between 26 to 40 GHz in order to demonstrate the advantages of utilizing the conformal FSS in the near-field. The conformal FSS is 3D printed and copper electroplated, which leads to a low-cost and lightweight bandpass filter array. Placing it in the near-field region of a primary antenna can be used as radomes to realize compact high-performance mm-wave systems. The comparison between simulated and measured conformal FSS results is in good agreement. The challenges that arise when designing, manufacturing, and measuring this type of structure are reported and guidelines to overcome these are presented.
Highlights
Conventional planar frequency selective surfaces (FSSs) are characterized in the far-field region and they are sensitive to the incidence angle of impinging waves
The results indicate that planar finite FSS does not offer the same level of passband bandwidth as the infinite FSS with normal incidence, because the transmitted wave impinging the FSS from the open-ended waveguide (OEWG) with a smaller range of incidence angles
The concept of using the conformal FSS in the near-field region is introduced in this paper, aiming to provide improved bandpass performance compared to the equivalent finite planar FSS structure
Summary
The concept of using the conformal FSS in the near-field region is introduced in this paper, aiming to provide improved bandpass performance compared to the equivalent finite planar FSS structure. The passband properties of the structure were presented showing that the use of a conformal FSS provides better angular stability and is less sensitive to the distance between the FSS and the receiver, compared to the finite planar case. Slots, etc.) with different dimensions on the curved array from the centre of the surface to the edges, so the edge effect can be mitigated. This new concept of curved FSS can be applied to build other types of metasurfaces, such as transmitarrays, lens, etc. This new concept of curved FSS can be applied to build other types of metasurfaces, such as transmitarrays, lens, etc. and could be used as a tunable polarizer for widening or narrowing its passband properties
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
