Publication: Tag antenna design for uhf
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Date
2010-04-01
Authors
Mamat, Airee Anuar
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Abstract
This project is concentrate on designing three type UHF tag antenna for RFID application that is Dipole Meandered tag antenna, Dipole Spiral tag antenna and Square Spiral tag antenna. Those antennas are design and simulated using Advanced Design System (ADS) software. All antennas are used microstrip line feeding. Dimension for those 3 antennas must be determined first to make sure we get an accurate result. Also, the dimensions of all antennas need to give an attention because it will determine the size of the tag antenna. The limitation size for tag antenna is around 5cm × 5cm. In determined what type of tag antenna that we want to design, we considered the polarization which is linear polarized and circular polarized. Both Dipole Meandered tag antenna and Dipole Spiral tag antenna are linear polarized type while Square Spiral tag antenna is circular polarized type. To be working for RFID application, those tag antenna need to operate at frequency of 919 MHz to 923 MHz (Malaysia UHF band for RFID) with the center frequency of 921 MHz. This center frequency is target frequency for all tag antenna design in this project. The magnitude of S(1,1) which is refer to return loss should be more than -10dB. Other antenna parameters such as gain, directivity, and radiation pattern obtain from the simulation using ADS software. The FR4 substrate is use as dielectric substrate for tag antennas. After fabrication, SMA connector will be soldered at feeding path. Testing and measurement will be carried out for S-Parameter analysis, radiation pattern analysis and gain analysis. Lastly, conclusion will be made based on simulation and measurement result. Some improvement for those designs is expected for future usage in the world.