Triple Band-stop Performance Realization Through a Single Substrate Layer Frequency Selective Surface

Abstract

A single-substrate-layer Frequency Selective Surface (FSS) is designed with a 1.6 mm thick FR4 substrate for triple band-stop frequency filtering applications, that are for Bluetooth, WLAN, WiMAX, and X-band. The proposed FSS unit cell consists of two polygon loops on the front side and a square loop with four annular rings attached to its corners on the backside. The offered design covers three frequency bands: 2.3-4 GHz, 5-6 GHz, and 8-12 GHz. There are three resonances at 3.3, 5.6, and 9.9 GHz. The equivalent circuit model of the proposed structure and the formulas of the LC parameters are presented. A prototype of this structure was manufactured in size of 26 × 26 cm² and experimentally verified in the antenna and microwave laboratory. The software used for design and simulation is HFSS from Ansys, which uses the finite element method. A comparison with similar structures was performed to demonstrate the performance of the proposed structure. The advantages of the proposed filter include adequate bandwidth, simple structure, as well as small size. In addition, it is unaffected by variant angles of incidence for TE polarization and TM polarization. Furthermore, due to its symmetrical design, it shows a polarization-independent feature. Experimental results for both polarizations verify the merits of the proposed approach, as shown before in the simulation results as well.

Keywords:

• Frequency selective surfaces(FSS)
• Bluetooth
• WLAN
• WiMAX
• X-band

DISCLOSURE STATEMENT

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

Consent to Participate

All authors agreed with the content and that all gave explicit consent to submit and that they obtained consent from the responsible authorities at the institute/organization where the work has been carried out.

Additional information

Funding

No funding was received to assist with the preparation of this manuscript

Notes on contributors

V. Nadjari

Vafa Nadjari received his BSc in electrical and telecommunication engineering from Urmia University in 2013 and MSc degree in telecommunication from Kamal University, Urmia, Iran in 2016. Now, he is a PhD candidate of telecommunication engineering at Urmia University. His research interests are frequency selective surfaces and antenna design. Corresponding author. Email: [email protected]

J. Nourinia

Javad Nourinia received his BSc in electrical and electronic engineering from Shiraz University and MSc degree in electrical and telecommunication engineering from Iran University of Science and Technology, and a PhD degree in electrical and telecommunication from the University of Science and Technology, Tehran, Iran in 2000. From 2000 he was an assistant professor and now he is a professor in the Department of Electrical Engineering of Urmia University, Urmia, Iran. His primary research interests are in antenna design, numerical methods in electromagnetics and microwave circuits. Email: [email protected]

Ch. Ghobadi

Changiz Ghobadi received his BSc in electrical engineering electronics and MSc degrees in electrical engineering telecommunication from Isfahan University of Technology, Isfahan, Iran, and a PhD degree in electrical-telecommunication from the University of Bath, Bath, UK in 1998. From 1998 he was an assistant professor and now he is a professor in the Department of Electrical Engineering of Urmia University, Urmia, Iran. His primary research interests are in antenna design, radar, and adaptive arrays. Email: [email protected]