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Isolation improvement of 2.4/5.2/5.8 GHz WLAN internal laptop computer antennas using dual‐band strip resonator as a wavetrap
Author(s) -
Kang TingWei,
Wong KinLu
Publication year - 2010
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.24831
Subject(s) - laptop , ground plane , multi band device , electrical engineering , antenna (radio) , microwave , planar , resonator , engineering , broadband , acoustics , physics , computer science , telecommunications , computer graphics (images) , operating system
A high‐isolation two‐antenna structure comprising two small‐size uniplanar WLAN antennas and a dual‐band strip resonator embedded in‐between for laptop computer application is presented. The proposed design occupies a small planar size of 9 × 50 mm 2 when mounted above the top edge of the large supporting metal frame of the laptop display. The two WLAN antennas are coupled‐fed printed PIFAs capable of covering 2.4/5.2/5.8 GHz band operation, each occupying a size of 9 × 13 mm 2 and both facing to each other back‐to‐back with a spacing of 24 mm (that is, the total length of the proposed two‐antenna structure is 50 mm). The embedded strip resonator functions as a dual‐band wavetrap over the 2.4 and 5.2/5.8 GHz bands to trap the antenna's near‐field radiation between the two antennas, which effectively reduces the mutual coupling between the two antennas. Good measured isolation ( S 21 < −18 dB) over the 2.4/5.2/5.8 GHz bands is obtained, which is acceptable for practical laptop computer applications. The proposed design works for the large ground plane condition in the laptop computer, different from many of the reported two‐antenna designs working for the relatively much smaller ground plane conditions such as in the mobile phones and PC cards. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 58–64, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24831