A Compact Dual-Band Antenna for Wireless Body-Area Network Applications

Abstract

A novel compact dual-band antenna for wireless body-area network (WBAN) is presented. The miniaturization is realized by bisecting a quadrant circular microstrip antenna along the fictitious magnetic wall, while the electric field distribution at 2.45 GHz is preserved. By slitting an open-ended quarter-wavelength slot, a second resonant mode at 5.8 GHz is excited. The proposed antenna is fabricated and measured both in free space and on-body. Enhancement in bandwidth and radiation patterns is observed for on-body performance compared with that in free-space. Measured fractional bandwidths of 1.2% and 2.0% are obtained at the two bands respectively when the antenna is mounted on-body, along with the corresponding simulated radiation efficiency values of 60% and 76%. The robust on-body performance reveals the proposed antenna a good candidate for low data-rate WBAN applications.Index Terms-Wireless body-area network (WBAN), dual-band, compact, on-body performance.

Circularly Polarized Rectangular Ring-Slot Antenna with Chamfered Corners for Off-Body Communication at 5.8 GHz ISM Band

“…The antennas reached stable on-body performance. The maximal reached gain of the antenna [4] was 5.16 dBi with the measured fractional bandwidth of 2.0 % for 5.8 GHz ISM frequency band. In [5], the authors published the miniaturized folded cavity backed crossed-slot antenna.…”

“…Further, SIW based antennas have usually small sensitivity to the surrounding environment. Possible SIW antenna candidates for off-body communication were presented in [2][3][4][5][6]. In [2], the two-pole filtering antenna based on a SIW resonator for BCC is presented.…”

“…Unfortunately, the antenna has two-layer configuration. To reduce the dimensions and complexity of the antenna, single layer antennas based on a quarter-mode SIW topology were proposed [3], [4]. The antennas reached stable on-body performance.…”

“…A further step was the redesign of the antenna for the textile substrate. Although the antenna concepts [3][4][5] have good impedance and radiation properties, they have the disadvantage of using a coax-to-SIW transition from their bottom side which limits their exploitation for BCC. In [6], a concept of the Koch slot loop antenna with tuning stub equipped by a coax-to-SIW transition in the antenna plane was proposed The Koch snowflake was created from the third interaction of the Koch fractal.…”

Checkerboard Electromagnetic Band Gap (Ebg) Structured S-Shaped Antenna for Wearable Applications

“…The technology to design and develop the printed antennas has been continuously altered from the structural view of configuration to antenna features improvement. EBG structures have play a very important role to improve the features of printed antennas [18][19][20][21]. "I"-typed EBG units with varying size and center distance are used.…”