Anti-reflection coating effects on beam performance of spiral-fed silicon lens antennas for THz communication

Hossain, A. K. M. Zakir and Azam, S. M. Kayser and Ibrahimy, Muhammad Ibn and Abd. Aziz, Mohamad Zoinol Abidin and Nor, Mohd. Khanapiah and Uddin, Jasim (2025) Anti-reflection coating effects on beam performance of spiral-fed silicon lens antennas for THz communication. In: 2025 IEEE International RF and Microwave Conference (RFM), 17-19 September 2025, Penang, Malaysia.

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Abstract

This paper presents a numerical investigation of anti-reflection coating (ARC) effects on the beam performance of a spiral-fed half-hemispherical silicon lens antenna for terahertz (THz) communication up to 3.5 THz. Four single-layer ARC materials - SU-8, PTFE, HDPE, and polystyrene - are compared against the non-coated (NC) case. Key metrics including directivity, sidelobe level (SLL), back lobe level (BLL), and front-to-back ratio (FBR) are investigated. Results show SU-8 achieving the highest performance, with directivity of 26.6 dBi, SLL of –17.8 dB, and FBR of 25.32 dB at 3.5 THz. These findings provide valuable design guidelines for optimizing ARC selection in high-performance THz lens antennas for communication and sensing applications.

Item Type:	Proceeding Paper (Plenary Papers)
Uncontrolled Keywords:	terahertz communication, silicon lens antenna, anti-reflection coating, beam performance, spiral-fed antenna
Subjects:	T Technology > T Technology (General) > T10.5 Communication of technical information
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering Kulliyyah of Engineering > Department of Electrical and Computer Engineering
Depositing User:	Dr Muhammad Ibrahimy
Date Deposited:	02 Jan 2026 12:08
Last Modified:	02 Jan 2026 12:08
Queue Number:	2025-12-Q1331
URI:	http://irep.iium.edu.my/id/eprint/126462

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