The Design Of The Wearable Antenna In Clothing

With the rapid development of mobile communication technology, the traditional Internet is rapidly moving forward to the mobile Internet, and growing popularity, after smart phones, tablet PCs, "intelligent wearable devices", "wearable technology" has become a hot research topic in the field of IT in recent years. In order to make the research of wearable devices more practical, the researchers put forward the concept of human center network. Human center network is an extension of the concept of wearable devices, namely taking human body as the center to build a wireless network connected the various kinds of electronic equipment, as one of the essential components of signal transmission and reception in the human center network, the wearable antenna has become one of the hot spots in the current research. In this paper, we mainly study the wearable dual-band antenna, including two major types of microstrip patch antenna printed on the fabric and button antenna.The main purpose of this paper is to design dual-band wearable antenna for clothing based on two ISM bands 2.4-2.4835GHz and 5.725-5.85GHz, through theoretical analysis, modeling and simulation and physical measurements to explore and design the new structure antennas, the main work is as follows:Firstly, this paper developed the microstrip patch antenna with soft fabric material as the substrate. Through literature research, put creatively and design a circular ring wide slot patch antenna, and has carried on the related simulation, emulation result makes clear, in the specified ISM dual band Sll of antenna can be less than-10dB(VSWR≤2). Through the investigation and research, this paper summarizes some design methods based on the relevant indicators of the subject, and on this basis, develops two new structure antennas(Circular patch antenna with double curved seam, rectangular slot diamond shaped patch antenna), and the rectangular slot Diamond patch antenna was tested. The test results show that real output performance and simulation results are in general agreement,, the VSWR can be less than 2 in specified ISM dual bands, and the antenna gain respectively is 5.5dB and 6.5dB in two center frequency 2.44GHz and 5.78GHz, the gain fluctuation is fairly stable at working frequency bands, and the antenna exhibits very good unidirectional radiation performance with the radiation to the human body is very small.Secondly, the button antenna with low profile and small size is developed under the condition of keeping the normal clothing’s appearance. In this paper, we developed a total of four button antennas:circular ring conformal antenna, T slot stereoscopic dual-band antenna, circular dual-band button antenna, stereoscopic branch antenna. Due to the strengths and weaknesses of performance, structure and production of the five antenna models, in this paper, we will introduce them one by one, and simulation and experimental analysis of the human influence on the antenna are carried out for the stereoscopic branch antenna, analyzed three kinds of state:work independently, placement of the abdomen, close to the arm. According to the production process and costs, in this paper, the semi handmade way is used for physical testing in the four independent designed button antennas. Test results are broadly consistent with the simulation results, the tested results show that:the designed antenna structures are feasible, VSWR is less than 2 in ISM dual-band, the maximum gain amplitude fluctuation is stable in the working frequency band, and the radiation patterns show very good one-way.