SMALL-SIZE PRINTED LOOP ANTENNA FOR PENTA-BAND THIN-PROFILE MOBILE PHONE APPLICATION

摘要

A planar printed loop antenna with a small area of 15 × 50 mm{sup}2 and capable of covering all five operating bands of GSM850/900/1800/1900/UMTS for WWAN (wireless wide area network) operation in the thin-profile mobile phone is presented. The antenna is very suitable to be directly printed on the system circuit board of the mobile phone, making it easy to fabricate at low cost and generally showing no thickness above the circuit board; the latter is very attractive for thin-profile mobile phone applications. In addition, the proposed loop antenna is very suitable to be printed at the bottom position of the mobile phone; in this case the antenna meets the SAR (specific absorption rate) limit for practical applications.