access icon free Ultrathin design and implementation of planar and conformal polarisation rotating frequency selective surface based on SIW technology

© The Institution of Engineering and Technology
Received 17/10/2017, Accepted 17/05/2018, Revised 10/04/2018, Published 18/05/2018

The design of novel ultra-thin polarisation rotating frequency selective surface based on substrate integrated waveguide (SIW) technology has been presented. The primary function of the structure is to select the linear polarisation from the impinging electromagnetic wave on it and to rotate the wave into the 90° counter-clockwise direction in the given frequency band. The proposed array consists of periodic Y-shaped slot elements surrounded by SIW cavities. The structure shows a relative bandwidth of 8% with impedance matching better than −10 dB and a very good insertion loss of 0.3 dB. It also offers co-polarisation below −20 dB in the passband. The proposed structure is very thin (0.055λ 0) compared to the existing SIW-based frequency selective polarising rotators. Also, the conformal analysis of the proposed structure has been carried to study its behaviour for real-time applications when used on curved surfaces. Finally, to prove the efficacy of proposed structure, a prototype has fabricated and measured its performance. A very good agreement is observed between the experimental and simulated results.

Inspec keywords: slot antennas; conformal antennas; planar antennas; substrate integrated waveguides; electromagnetic wave polarisation; frequency selective surfaces

Other keywords: substrate integrated waveguide; SIW technology; periodic Y-shaped slot elements; counter-clockwise direction; linear polarisation; planar polarisation rotating frequency selective surface; electromagnetic wave; ultrathin design; conformal polarisation rotating frequency selective surface; ultra-thin polarisation rotating frequency selective surface; loss 0.3 dB

Subjects: Single antennas; Microwave materials and structures; Waveguides and microwave transmission lines

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