Research On The Antenna With The Detection Of The Indoor Communication Area Of The Active RFID Tag

The RFID (Radio Frequency Identification) system as a new identificationtechnology has been widely used. The electronic tag, because of its low cost and highpositioning accuracy, is expected to become a kind of optimization of indoorpositioning technology. Currently using narrow beam antenna to detect the tagpositioning scheme of communication areas also has raised popular attention. Thistopic mainly studies and designs several kinds of detecting antennas which apply tothe indoor positioning technology of tag, and makes experiments aboutcommunication area detection of RFID tag. Its contents mainly include:First of all, the design of rod antenna, a coaxial feed and a micro-strip line fedmicro-strip patch antenna elements with2.4GHz center frequency, using a micro-stripline fed patch unit group array, and the best patch unit space is0.6λ0. The simulationresult shows that although the return loss at2.4GHz center frequency meets thedesign requirements, the main width of E lobe surface is about50o, which means arelatively wide beam can’t reach the narrow beam requirements.Second, a kind of distance array antenna with2.4GHz center frequency isdesigned. The antenna uses air as the dielectric materials, and the space between theradiation patch layer, the ground plane layer and a reflective layer are air. ThroughADS to design a parallel feed power divider network. After the simulation andoptimization process, we obtain the final optimal dimensions for manufacture. Aprototype antenna was fabricated according to the best physical dimensions. Fromsimulation results we can see that S11=-16.78dB at2.4GHz center frequency and theE plane beam is about12owhich reach the requirements of narrow beam. On the basisof the testing to the antenna, the E plane beam is about19oand return loss is-12.36dBof the antenna, the simulation results are consistent with the experiment results.Finally, with the distance narrow beam array antenna to build the2.4GHz activeRFID tag communication area detection system, and makes testing experiments aboutcommunication area of RFID tag. The experiment results show that the distancenarrow beam array antenna can be applied to an active RFID tag communication areadetection and be expected to be applied to the tag positing system.