Open AccessDual‐band MNG patch antenna for smart helmet
Author(s) -
Lee H.,
Yang H.,
Myeong S.,
Lee K.
Publication year - 2018
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2018.6044
Subject(s) - multi band device , bandwidth (computing) , patch antenna , physics , antenna (radio) , radio spectrum , electrical engineering , frequency band , acoustics , optics , telecommunications , computer science , engineering
A novel dual‐band compact patch wireless fidelity (Wi‐Fi) antenna using μ‐negative (MNG) transmission lines (TLs) for the smart helmet is presented. In the smart helmet scenario, rescue agent is able to communicate with the other rescue agents, control centre, and drones via the helmet by Wi‐Fi dual bands. For the smart helmet communication, the antenna, which consists of two MNG‐TL loops located on the outside and inside, is devised. The dual‐band corresponds to the zeroth‐order resonance (ZOR) and second‐positive‐order resonance (SPOR) of the outer MNG‐TL. The ZOR frequency of the outer MNG‐TL is near the Wi‐Fi 2.4 GHz band, and the SPOR frequency of the outer MNG‐TL, excited by the coupling between the inner and outer MNG‐TL loops, is the Wi‐Fi 5 GHz band. The prototype of the proposed antenna has been fabricated and measured. The bandwidth of the antenna includes Wi‐Fi 2.4 and 5 GHz bands with high radiation efficiencies of >49% and a compact size of 27.6 mm × 27.6 mm × 1.27 mm (1/4.5 λ × 1/4.5 λ × 1/98.4 λ at the lowest operating frequency).