The Research Of Antenna Quality In Short Range Wireless Testing System

With the fast development of wireless communications technology, people take notice of the wireless communications demand within one room or between something that don't apart far away from each other, in some cases transmitter or receiver locates in complicated conditions, bring forward a blue print of circle antenna used in dynamic testing system which provides a new technical approach to resolve the data transmission with wireless communication transmitter located in bad condition such as rotating mode and so on.Firstly, introduce the brief history of antenna and status quo of wireless communications technology in short range home and abroad, then make the elements of antenna radiation clear, do deduction related to the radiation of ideal current cell; accurately define a series of qualitative and quantitative parameters which scale the antenna quality, make a brief presentation of antenna design and simulation automated software ADS\HFSS\MATLAB and measurement instrument vector network analyzer HP8753E, as a function of frequency response, antennas can be sorted as four kinds, take the typical structure into account, set up the model and do simulation and analysis, summarize the characters, merits and defects of each kind of antennas; concern a wireless communications in short range works in relatively bad conditions, put forward a blue print that turn transmitter antenna to be circle-shaped, when the radius of the antenna is a little larger than that of the shaft and fixed to the testing circuit, the center of the circle superpose the center of the shaft, here the testing circuit and the antenna rotate with the shaft and the circle-shaped antenna structure keep stillness refer to the ground, the tested shaft is made of steel, make use of high frequency structure simulation software HFSS and advanced design system ADS, by comparison between modeling and analysis with different antenna materials, different radiuses of the circle(the center of the circle doesn't superpose that of the tested shaft and the structure doesn't keep stillness refer to the ground anymore with the augmentation of the radius of the circle) and different radiuses of the antenna, fix on the parameters, get results with reason, and insert an amplifying circuit to the output port of the transmitter, accomplish the impedance matching and further amplifying of the signal, make improvement to the transmitting and receiving quality of the wireless dynamic testing system.