Open AccessEnhanced directivity and bandwidth of a stepped open‐slot antenna with L‐shaped slots and parasitic strip
Author(s) -
Wu Jiangniu,
Zhao Zhiqin,
Ellis Mubarak Sani,
Nie Zaiping,
Liu Qing Huo
Publication year - 2014
Publication title -
iet microwaves, antennas and propagation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.555
H-Index - 69
eISSN - 1751-8733
pISSN - 1751-8725
DOI - 10.1049/iet-map.2013.0304
Subject(s) - directivity , bandwidth (computing) , slot antenna , acoustics , antenna (radio) , telecommunications , electrical engineering , electronic engineering , physics , engineering , antenna measurement
In this study, a printed stepped open‐slot antenna with unidirectional radiation characteristics is presented. Using a stepped feeding slot and a parasitic metal strip, the impedance matching is improved and a wide bandwidth is achieved. Additionally, by modifying the ground plane with a pair of L‐shaped slots, the radiation directivity of the proposed antenna is significantly enhanced and good unidirectional radiation characteristics are obtained. To demonstrate the effectiveness of the design, a prototype antenna is fabricated and tested. Experimental results show that the antenna provides a fractional bandwidth of 101%, ranging from 3.65 to 11.1 GHz with a compact size (30 mm × 30 mm). A moderate gain, which is better than 4 dBi, is also obtained. In addition, a stable radiation directivity, which is fixed in the endfire direction ( y ‐axis direction) is achieved. The measured front‐to‐back ratio is larger than 9.5 dB within the effective bandwidth.