Miniaturised UWB antenna with dual-band rejection of WLAN/WiMAX using slitted EBG structure

• Published in: IET microwaves, antennas & propagation Vol. 13; no. 3; pp. 360 - 366
• Main Authors: Ghahremani, Mehdi, Ghobadi, Changiz, Nourinia, Javad, Ellis, Mubarak Sani, Alizadeh, Farzad, Mohammadi, Bahman
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 27.02.2019; Wiley
• Subjects: antenna radiation patterns; band‐pass filters; defected ground structure; defected ground structures; dual‐band rejection; full‐size antenna characteristics; interfering bands; microstrip antennas; microstrip tapered feed line; microwave access bands; miniaturised UWB antenna; notch filters; notched bands specifications; photonic band gap; reference antenna; Research Article; simple UWB antenna; slitted EBG structure; slitted electromagnetic bandgap structure; structural symmetry; ultra wideband antennas; ultra wideband communication; ultra‐wideband spectrum; WiMax; wireless LAN; WLAN/WiMAX; worldwide interoperability for microwave access; ultra-wideband spectrum; WLAN/WiMAX; ultra wideband antennas; ultra wideband communication; reference antenna; notch filters; slitted electromagnetic bandgap structure; dual-band rejection; slitted EBG structure; band-pass filters; miniaturised UWB antenna; antenna radiation patterns; worldwide interoperability for microwave access; defected ground structures; microstrip tapered feed line; photonic band gap; WiMax; microwave access bands; microstrip antennas; simple UWB antenna; full-size antenna characteristics; interfering bands; notched bands specifications; structural symmetry; wireless LAN; defected ground structure
• ISSN: 1751-8725; 1751-8733
• DOI: 10.1049/iet-map.2018.5674

This study presents a new slitted electromagnetic bandgap (EBG) structure to filter undesired wireless local area network (WLAN) and worldwide interoperability for microwave access (WiMAX) bands in the ultra-wideband (UWB) spectrum. A simple UWB antenna which consists of a microstrip tapered feed line, a circular patch and a defected ground structure is used as a reference antenna. The antenna is then integrated with a slitted EBG structure near the feed line to notch two interfering bands. The created notched bands by the EBG structure can be independently controlled. Owing to structural symmetry of the proposed antenna, the size can be reduced by approximately half to form a miniaturised antenna. The miniaturised antenna has the same full-size antenna characteristics with little change in the notched bands specifications. Frequency domain measurement results show that the full-size and miniaturised antennas have a flat transfer function, and a group delay variation of about 0.5 ns in the entire UWB band except for the notched bands.