Title :
Quarter-Wavelength Printed Loop Antenna With an Internal Printed Matching Circuit for GSM/ DCS/PCS/UMTS Operation in the Mobile Phone
Author :
Chi, Yun-Wen ; Wong, Kin-Lu
Author_Institution :
Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Kaohsiung, Taiwan
Abstract :
A small-size printed loop antenna with an internal printed matching circuit capable of GSM/DCS/PCS/UMTS operation in the mobile phone is proposed. The antenna comprises an 85-mm long folded loop strip and an internal printed matching circuit encircled therein and formed by a coupling strip and an inductive strip. The loop strip is excited by the coupling strip to generate a 0.25 lambda resonant mode at about 900 MHz for GSM operation. For the inductive strip, it effectively causes a wideband higher order mode at about 1900 MHz for DCS/PCS/UMTS operation. Further, the antenna shows a uniplanar structure and requires a very small printed area of 170 mm2 on the system circuit board of the mobile phone, making it easy to fabricate at low cost. Details of the proposed antenna and its radiation performances including the SAR (specific absorption rate) results are studied.
Keywords :
3G mobile communication; antenna radiation patterns; cellular radio; loop antennas; microstrip antennas; mobile handsets; GSM/ DCS/PCS/UMTS operation; antenna radiation performances; frequency 1900 MHz; frequency 900 MHz; internal printed matching circuit; mobile phone; quarter-wavelength printed loop antenna; size 85 mm; specific absorption rate; 3G mobile communication; Coupling circuits; Distributed control; GSM; Mobile antennas; Mobile handsets; Personal communication networks; Printed circuits; Resonance; Wideband; Internal mobile phone antennas; loop antennas; printed antennas; printed matching circuit; quarter-wavelength loop antennas;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2009.2027152
