《Printed Loop Antenna With a U-Shaped Tuning》.pdf

3464 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 58, NO. 11, NOVEMBER 2010 Printed Loop Antenna With a U-Shaped Tuning Element for Hepta-Band Laptop Applications Chien-Wen Chiu, Member, IEEE, and Yu-Jen Chi, Student Member, IEEE Abstract—A simple printed-loop antenna with wideband char- be thin or rectangular, with a long length to width ratio, i.e., the acteristics is presented for laptop computer applications. The practical antenna profile must be nearly planar: thin but long. In proposed rectangular loop pattern generates four resonant modes the past decade, researchers have proposed some practical an- below 4 GHz. The excited modes, two unbalance and two balance, are analyzed and discussed. A novel U-shaped tuning element tenna designs for laptop applications, some in the WLAN bands printed on the back side of the circuit board adjusts the resonant and some in the WWAN bands [1]–[5]. Recently, Wong et al., modes to cover GSM850/GSM900/DCS/PCS/UMTS/WLAN and demonstrated a printed monopole slot antenna can be attrac- WiMAX bands. Using HFSS software, this study conducted a sim- tive for multiband laptop computer applications. The proposed ulation to optimize the antenna design and fabricate a practical monopole slot antenna can achieve small size (60 mm 12 mm) structure to investigate its performance and characteristics. This study also measures various antenna parameters to validate the [6], [7]. To achieve low prices, a uniplanar inverted-F antenna proposed antenna. was proposed for the above application. The uniplanar PIFA which is prin