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Small‐size wideband monopole antenna closely coupled with a chip‐inductor–loaded shorted strip for 11‐band WWAN/WLAN/WiMAX operation in the slim mobile phone
Author(s) -
Wong KinLu,
Lee ChengTse
Publication year - 2011
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.25712
Subject(s) - monopole antenna , electrical engineering , wideband , antenna (radio) , wimax , printed circuit board , mobile phone , engineering , umts frequency bands , electrical length , electronic engineering , omnidirectional antenna , antenna efficiency , telecommunications , wireless
A small‐size wideband antenna suitable for the 11‐band WWAN/WLAN/WiMAX operation in the slim mobile phone is presented. The wideband antenna has a simple structure and is formed by a printed monopole closely coupled with a chip‐inductor‐loaded shorted strip. The antenna occupies a small footprint of 15 × 20.5 mm 2 (∼308 mm 2 ) on the system circuit board and can generate two wide operating bands for the desired 11‐band operation. The antenna's upper band is mainly contributed by the printed monopole and covers the GSM1800/1900/UMTS operation (1710–2170 MHz), the 2.4/5.2/5.8 GHz WLAN operation (2400–2484/5150–5350/5725–5875 MHz), and the 2.5/3.5/5.5 GHz WiMAX operation (2500–2690/3300–3800/5250–5850 MHz). The lower band is contributed by the parasitic chip‐inductor‐loaded shorted strip closely coupled by the printed monopole and covers the GSM850/900 operation (824–960 MHz). Further, the antenna can be disposed on the system circuit board of the mobile phone with a small thickness of 3 mm only, allowing the antenna very promising to be applied in the modern slim mobile phone. Detailed results of the proposed antenna are presented. The specific absorption rate results of the antenna, including the case with the user's hand presence, are also analyzed. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:361–366, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25712