On the Performance of a Microstrip Antenna Based UC-PBG Structures for UHF RFID Readers | ||
| Engineering and Technology Journal | ||
| Article 1, Volume 36, 5A, May 2018, Pages 480-487 PDF (915.01 K) | ||
| DOI: 10.30684/etj.36.5A.1 | ||
| Authors | ||
| Ali S. Jalal* 1; Marwa H. Jwair2 | ||
| 1Department of Information and Communication, Engineering, College of Information Engineering, Al-Nahrain University, Baghdad, Iraq. | ||
| 2Department of Information and Communication Engineering, College of Information Engineering, Al-Nahrain University, Baghdad, Iraq. | ||
| Abstract | ||
| Microstrip antennas suffer from low gain bandwidth product due to surface wave effects and aperture diffractions that limit their use for long-range communications. On top of that, the difficulty of achieving a pure circularly polarized radiation with high gain due to the feeding structure effects. This paper is subjected to design a gain enhanced circularly polarized patch antenna using Uniplanar Compact-Photonic Band Gap (UC-PBG) structu.res for UHF RFID applications. The patch is structured as truncated corners with cross slots at the centre mounted on an FR-4 epoxy substrate of 1.6mm thickness with an overall area of 188×188mm2. The UC-PBG is constructed of two layers; each is made of 7×7 unit cells, separated by 20mm mounted from the top of the patch at 30mm height. The unit cell characterizations are evaluated in terms of their S-parameters and dispersion diagram CST-MWS environment. The antenna shows a boresight gain of about 8.2 dBi at 915MHz with a front to back ratio (F/B) of 13dB. The benchmark enhancement in boresight gain after adding the UC-PBG layers is found to be 3.4 dBi with a radiation efficiency of 87%. Finally, an excellent agreement is achieved between the obtained measurements and numerical results. | ||
| Keywords | ||
| Circular Polarization; RFID; UHF; UC-PBG | ||
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