A Novel Miniaturized Mutil-Mode Pattern Diversity Antenna for Wearable Wireless Communications

A novel miniaturized, multi-mode, pattern diversity antenna for wearable wireless body area networks is proposed. The antenna uses even-modes to provide directional and omnidirectional radiation patterns, which can realize the miniaturization of the antenna. The omnidirectional radiation pattern is obtained by introducing a probe to excite TM
01
mode. The directional mode is realized by exciting the first negative order resonance (-1st mode) based on compound right-/left-hand (CRLH). Compared with the traditional patch antenna, the -1st mode works in the LH region, which is much lower than the +1st mode resonance. These CRLH resonators are realized by etching the gap on the surface of the chip and introducing short-circuit pins. The CRLH circuit consists of series and parallel inductors and capacitors provided by the above mentioned constitute. In addition, the antenna has simple structure and low profile. It only consists of patch, pins and thin metal ground, which is easy to process. Finally, the two antennas are integrated together to achieve pattern diversity, effectively save space and realize the miniaturization of the antenna. Its overall size is only 0.41λ
0
× 0.41λ
0
× 0.049λ
0
.