A miniaturized quad-band frequency selective surface for C-band applications

Abstract

In this paper, a low-profile quad-band frequency selective surface (FSS), designed as a sub-reflector for satellite communication is presented. This single layered FSS employs non-concentric open loops with controlled field coupling to provide four closely spaced transmission zeroes within the C-band. The proposed design approach occupies lesser metallized area which gives an additional benefit of frequency tuning while retaining the miniaturized cell dimension. The four band-stop center frequencies are 4.6, 5.5, 6.3 and 7.3 GHz with an average bandwidth of 240 MHz. The unit cell has a miniaturized dimension of 0.138${\lambda }_0\times$0.138${\lambda }_0\times$0.012${\lambda }_0$, where ${\lambda }_0$ stands for free space wavelength at the lowest resonating frequency. The FSS provides angularly stable frequency response up to ${45}^{\circ }$ for TE as well as TM polarization. Additionally, the FSS can be mechanically tuned to allow either TE or TM polarized wave. This study also reports the outcomes based on parametric variations and verifies the frequency behaviour of the structure using a circuit model. The simulated results are validated by testing a design prototype of the proposed FSS. Good concordance is observed between the simulated and measured results.

Keywords:

• C-band
• frequency selective surfaces
• quad-band
• sub-reflector

Acknowledgments

This work is partially supported by the National Institute of Technology Trichy seed grant NITT/R&C/SEEDGRANT/19- 20/P.09/ECE/SSK. The authors thank Mrs. T. Adilaxmi and Mr. Rambabu of ACD Communications, Hyderabad, India, for providing the far-field measurement facilities.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

National Institute of Technology Trichy seed grantNITT/R&C/SEEDGRANT/19- 20/P.09/ECE/SSK

Notes on contributors

R. Adeline Mellita

R. Adeline Mellita is currently pursuing her PhD degree with the Department of Electronics and Communication Engineering, at Indian Institute of Information Technology Design and Technology, Kancheepuram, India. Her research interests include frequency selective surfaces, metamaterial absorbers, antennas and microwave passive components.

S. S. Karthikeyan

S. S. Karthikeyan received the B.E. degree in Electronics and Communication Engineering from Bharathidasan University, Trichy, in 2001 and M.E. in Applied Electronics from Sathyabama University, Chennai, in 2005. He obtained his Doctoral Degree from the Indian Institute of Technology Guwahati, Assam, India in 2011. He is currently an Assistant Professor in the Department of Electronics and Communication Engineering, National Institute of Technology, Tiruchirappalli, India. His research interests include electromagnetic bandgap substrates, microwave filters, metamaterials, microwave sensors, etc.

P. Damodharan

P. Damodharan received the B.E degree in electrical and electronics engineering from the Bharathidasan University, Tiruchirappalli, India, in 1996, the M.E. degree in power electronics and drives from the College of Engineering Guindy, Anna University, Chennai, India, in 2001, and the Ph.D. degree in electrical engineering from Indian Institute of Technology. Madras, Chennai, in 2008. He is currently an Assistant Professor in the Department of Electronics and Communication Engineering, Indian Institute of Information Technology, Design and Manufacturing, Kancheepuram, India. His research interests include power electronics and drives.

D. S. Chandu

D. S. Chandu has received his PhD degree from Indian Institute of Information Technology, Design and Manufacturing Kancheepuram, India in 2019. He was a Faculty at National Institute of Technology, Andhra Pradesh. He is currently an Assistant Professor in the Department of Electronics and Communication Engineering, Vellore Institute of Technology, Andhra Pradesh. His research interests include Printed Antennas, Substrate Integrated Waveguides and Frequency Selective Surfaces.