2.4GHz Ring Fractal Antenna Design

With the rapid development of wireless communication technology, which is widely usedin people’s life and work. In recent years, with the proposed wireless sensor networktechnology, wireless communications and sensor testing technology more closely connected.However, wireless communication is inseparable from the antenna, the antenna is animportant device for electromagnetic wave propagation. It make wireless module to send asignal having directivity emitted, the more effective to increase the reception power of thereceiving end. Receiving the signal of the same power, increasing the antenna, tantamount toincrease the transmission distance. This work to be done for this article is to ensure that theantenna gain in the case, so that the miniaturization of the antenna to ensure the survival ofthe antenna in the field of explosion.First，For microstrip antenna radiation theory and basic performance parameters isintroduced. Microstrip antenna is equivalent to a low-resistance transmission line connectingthe two radiation seam, external radiation by the radiation slot. Before antenna design, theestimated performance of the antenna parameters (such as pattern, directivity, efficiency, inputimpedance, polarization and band), which will greatly improve the quality and efficiency ofthe antenna research. AP plus or minus45°dual-polarized antenna, linear polarization andcircular polarization of two polarization forms of polarization efficiency, no specialrequirements for the form of the polarization of the antenna.Second, in this word, several antenna miniaturization design ideas, the integrated antennasize, gain, ease of processing, aesthetics and other factors, and to identify appropriate methods,and ultimately determine the use of fractal theory to design the antenna. Annular antennastructure can be very good with the test device perfect shape, Koch points shaped by making amicrostrip ring antenna bandwidth to meet the IEEE802.11protocol. Koch fractal structure ofdifferent orders compared, it was found that the third-order Koch fractal, smaller size, a reduction of60%, the antenna gain compared to other order changed little, so the final choiceof the third-order Koch fractal antenna. Fractal structure due to their own self-similarity, itwill produce a multi-frequency effect. The third-order Koch antenna to resonate in the5.5GHz band. Finally, since the antenna is attached to the steel shell surface, the antennaaffected to some degree, subsequently corrected for this situation to ensure the best conditionof the antenna.Used Ansoft HFSS V13electromagnetic simulation software based on the finite elementmethod on antenna simulation design.