Premium
An ultra‐small cavity‐backed sector antenna with fractal transmission lines and NRI‐TLs for VHF application
Author(s) -
Cao Weiping,
Sun Chengjie,
Li Jinxin,
Li Simin,
Lin Yiyu
Publication year - 2018
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31493
Subject(s) - optics , patch antenna , antenna efficiency , coaxial antenna , bandwidth (computing) , materials science , omnidirectional antenna , antenna (radio) , antenna measurement , electrical engineering , physics , telecommunications , computer science , engineering
Abstract A novel ultra‐small cavity‐backed sector antenna with fractal transmission lines (FTLs) and negative refractive index transmission lines (NRI‐TLs) is proposed in this paper. The proposed antenna comprises three parts. The first one is a U‐shaped cavity‐backed antenna composed of a planar double‐sector patch and a U‐shaped backed‐cavity. The other two parts are FTLs and NRI‐TLs, respectively, both of which are used to achieve bandwidth enhancement and size reduction for the U‐shaped cavity‐backed antenna. Although the U‐shaped cavity‐backed antenna and the proposed antenna have the same size of 36 cm × 40 cm × 25 cm, the proposed antenna can operate in a lower frequency band. Due to the introduction of the negative refractive index transmission lines, the overall size reduction is up to 12.3%. With features such as ultra‐small size, moderate bandwidth and good radiation property, the proposed antenna can meet the demanding requirements to the application of UAV airborne system.