Chip‐inductor‐embedded small‐size printed strip monopole for WWAN operation in the mobile phone

A simple small‐size printed strip monopole embedded with a chip inductor for covering all the five operating bands of GSM850/900/1800/1900/UMTS for wireless wide area network (WWAN) operation in the mobile phone is presented. The antenna consists of a chip‐inductor‐embedded longer radiating strip and a shorter radiating strip. With a 10‐nH chip inductor embedded, the longer radiating strip has a length of about 46 mm only (about 0.14 wavelength at 900 MHz), yet supports a wide resonant mode at about 900 MHz for the antenna's lower band to cover GSM850/900 operation. The shorter radiating strip has a length of about 30 mm (about 0.2 wavelength at 2000 MHz) and provides a wide resonant mode at about 2000 MHz for the antenna's upper band to cover GSM1800/1900/UMTS operation. With the five operating bands covered, the two radiating strips occupy a small printed area of about 350 mm 2 on the system circuit board of the mobile phone. Details of the proposed antenna are described, and the specific absorption rate results of the antenna are also analyzed. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 966–971, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24225