1. UKM Learning and Research Repository
2. Master Thesis / Tesis Master
3. Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

Title:	Development of high gain microstrip antenna for RFID application
Authors:	Anabi Hilary Kelechi (P54644)
Keywords:	Radio Frequency Identification (RFID) Internet of Things Microstrip Universiti Kebangsaan Malaysia -- Dissertations
Issue Date:	9-Apr-2012
Description:	Radio Frequency Identification (RFID) is ubiquitous in the Auto - ID industry because it is an enabling technology for the internet of things. Its ability to store data and nonline-of sight has increased the popularity of RFID system over the barcode technology. Passive UHF RFID system encounters some performance limitations such as; chip sensitivity, antenna gain, antenna polarization, impedance match, tag detuning, poor read range and limited bandwidth. Microstrip antennas (MSAs) offer attractive choice because of their well-known advantages that include; low profile, lightweight, conformity as well as their ease of fabrication. However, conventional microstrip antennas have some inherent disadvantages such as; low gains and limited bandwidth. Therefore, for MSA to serve as antenna for RFID tags, some engineering maneuvering is required. In this project, a unique passive UHF RFID wideband antenna operating in the range of 0.960 - 1.140 GHz and 2.45 - 2.60 GHz were stimulated, fabricated and analyzed. Several contemporary MSA techniques were deployed in simulating and fabricating the antennas and such techniques used include; inverted F ground plane, microstrip feed line, unequal arm, offset feeding technique and antenna beam forming. The resultant effect of all these techniques is the simulation of a high gain MSA for UHFand microwave RFID applications. Furthermore, capacitor loading was introduced on the simulated UHF patch antenna to yeild a dual band MSA operating at 2.45 - 2.60 GHz. The introduction of parasitic loading technique introduces impurity in the antenna and subsequently, lowers the Q value of the antenna. The antenna was analyzed via a commercially available fullwave, Method-of-Moment (MoM) based electromagnetic simulator (Zeland IE3D version 12.0). The results for the VSWR, gain and co-and cross-polarization patterns were presented. A simulated gain of approximately 3 and 3. 5 dBi respectively were recorded for UHF and microwave band. The simulated gain in the UHF frequency spectrum when compared with commercially available UHF SENSTECH RFID tag can be technically said to exhibit a high gain because the gain of SENSTECH RFID tag is quoted to be 0 dBi. Accordingly, the antenna operating in the band of 0.960 - 1.140 GHz and 2.45 - 2.60 GHz shows a measured impedance bandwidth (2:1 VSWR) of 27% and 8 % respectively. However, a radiation efficiency of about measured 90 % was obtained which is slightly lower than the stimulated value of 95% for the same parameters in both frequencies. The proposed antenna is Y shaped patch with unequal monopole arms and is responsible for the dual resonant frequencies at 0.96 and 2. 45 GHz of the antenna. The dielectric used was duroid 6202 with εr = 2.94, double sided, copper cladding thickness of 1.524 mm. Overall, the fabricated antenna is robust because of it can be made to operate in a dual frequency band, occupies less space and less expensive material-wise because a fraction of substrate materials were used.,Certification of Master's/Doctoral Thesis" is not available
Pages:	145
Call Number:	TK7871.67.M5K435 2012 3 tesis
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.