A Novel Compact CPW-FED Printed Dipole Antenna for UHF RFID and Wireless LAN Applications

Transcription

1 International Journal of Electronics and Computer Science Engineering 427 Available Online at ISSN A Novel Compact CPW-FED Printed Dipole Antenna for UHF RFID and Wireless LAN Applications P. Prabhu 1, C.Poongodi 2,R.Ranjith Kumar, K. Prabhakaran Pg Scholar 1,3,4,, Associate Professor 2 Bannari Amman Institute Of Technology, Tamil Nadu, India 1,2 Ramakrishan Engineering Collge,Tamilnadu India 3,4 Prabhu.beece66@gmail.com ABSTRACT-A novel compact CPW-fed printed dipole antenna is proposed for dual-band Ultra wide band (UHF) RFID and wireless local area network (WLAN) operations. This antenna consist of two dipole elements and it covers 2.53 GHz Ultra High Frequency (UHF) RFID and 5.2 GHZ WLAN IEEE Standards. The return loss, radiation pattern, field pattern, linear and circular polarization components are simulated for this proposed antenna and it has simple design, compact size and exhibits broadband impedance matching characteristics. Some parametric studies of the geometric and radiation characteristic of the proposed antenna will explored with in further discussion to provide inside antenna view of antenna design. Keywords-CPW-fed ; UHF RFID; WLAN; 1. INTRODUCTION RFID and WLAN is emerging technology in wireless communication and it needs efficient antenna design. An RFID system is a wireless communication system in which object can be identified and analyzed without having any physical contact with it. The RFID technology can be used in many applications like distribution industry, delivery service control, library management, parking control, and patient supervision in hospitals. Due to this rapid growth in the radio frequency technology, RFID tag antennas are available in market with very small sizes like cards, labels and coins. Different frequency range has been allocated in different countries for RFID application. The most commonly used frequencies are LF (125 khz, 135 khz), HF (13.56MHz) [5], amateur band ( MHz), UHF (300MHz to 3 GHz) and microwave frequency (2.45 GHz and 5.8 GHz) [2]. WLAN is operating at ISM band range 5.15/5.35 GHz range [3]. Each frequency range has different abilities to receive signals across distances and to penetrate through different materials, so RFID systems have different applications in different frequency ranges. Many organizations are carrying out proceedings on RFID applications.[5] The operating frequency for the RFID systems rises into the microwave region; the design of RFID antenna becomes more complicated and critical. In antenna design dielectric materials are not directly connected with conducting material, Co-planer wave guide (CPW) feeding method is used in this simulation and this feeding method is efficient compare to the microstrip feeding method. This proposed antenna is compact in size and efficient in the operating frequency range 2.53GHz for UHF RFID and 5.2 GHz for WLAN IEEE applications. 2. ANTENNA DESIGN Figure.1 shows geometry of the proposed antenna for a UHF RFID and WLAN operations. In this proposed antenna look like mirror of G shape and it is printed on Rogers_RT_Duroid6002 substrate with 2.93 dielectric constant, fed using CPW with 50 ohm line for the excitation. This proposed antenna is simulated using Advance Design System software. In this resonance frequency is achieved using equation, f 2π 1 = (1) LC f- Resonate frequency, This antenna is tuned for two resonant frequencies and it is given by

2 IJECSE,Volume2, Number 2 P. Prabhu et. al. 428 where f 1 = λ * g c ε eff λg - wavelength, ε -permittivity f c 2 =.(3) λ g * ε 1 eff where λg1 wavelength, ε -permittivity..(2) The length L of the proposed antenna is given by L = 2w + 4w + 4w + 2w + 2g + 4g + 2g + 2L + 4L + 2..(4) [ ] L3 The first resonance frequency for printed dipole antenna is at 2.53 GHz and second resonance frequency is at 5.2GHz. These resonant frequencies are mainly used in UHF RFID and WLAN applications and this resonant frequency is achieved by adjusting the dimensions of antenna parameters. The final parameters for MEMS simulations are the dielectric constant 4.5, substrate thickness 1.2mm, the length of the antenna are L 1= 2mm, L 2= 12mm, L 3= 8mm, L 4= 16mm, L 5= 10.5mm and trace width of the antenna W 1 =10mm, W 2 =10mm, W 3 =5.5mm, W 4 =1mm, W 5 =3mm. Thus the guided wave length corresponding to the resonant frequency 2.53GHz and 5.2 GHz is calculated from this dimensions based on the systematic comparative studies by means of simulation using ADS 2012 and a set of suitable geometric parameters for the antenna is designed, such that the antenna operates around GHz and 5.2 GHz band with a sufficient impedance bandwidth. Figure.2 Geometry Of Proposed Antenna Structure In ADS.

3 A Novel Compact CPW-FED Printed Dipole Antenna for UHF RFID and Wireless LAN Applications 429 Figure.1geometry Of The Proposed Antenna Structure. Table.1 Antenna Parameters Of The Proposed Antenna. Parameter L1 L2 L3 L4 L5 W1 W2 W3 W4 W5 Dipole Antenna parameters Value 2mm 12mm 8mm 16mm 10.5mm 10 mm 10mm 5.5mm 1mm 3mm 3. RESULTS AND DISCUSSIONS The proposed antenna has been successfully simulated. Radiation pattern of the CPW-fed antenna shown in Figure.3

4 IJECSE,Volume2, Number 2 P. Prabhu et. al. 430 Figure.3 Radiation Pattern Of Cpw-fed Printed Dipole Antenna Figure.4 Return Loss Resonant Frequency Of Cpw-Fed Printed Dipole Antenna Return loss of the CPW-fed printed dipole antenna shown in Figure.4.In this CPW-fed printed dipole antenna has the less return loss of -19dB at 5GHz frequency. The resonant frequency for RFID occurs at 2.53GHz with -14dB and another resonant frequency for WLAN occurs at 5.2 GHz with -19dB. In this return loss clearly shows proposed antenna can operate in two frequency 2.53GHz and 5.2 GHz. Effective area of the CPW-fed antenna is shown in Figure.5. An absolute field of proposed antenna shown is in Figure.6. Electrically linear and circular polarization of the proposed antenna is shown in Figure.6 &.7 respectively.

5 A Novel Compact CPW-FED Printed Dipole Antenna for UHF RFID and Wireless LAN Applications 431 Figure.5 Effective Area Of Cpw-Fed Printed Dipole Antenna. Figure.6 Absolute Fields Of Cpw-Fed Printed Dipole Antenna. Figure.6 E-Plane Circularl Polarization Of Cpw-Fed Printed Dipole Antenna.

6 IJECSE,Volume2, Number 2 P. Prabhu et. al. 432 Figure.7 E-Plane Linearly Polarization Of Cpw-Fed Printed Dipole Antenna. Figure.8 Gain And Directivity Of Cpw-Fed Printed Dipole Antenna. Gain and directivity of the CPW-fed printed dipole antenna is 4.57 dbi and 4.0 dbi for the resonant frequencies 2.53GHz and 5.2 GHz respectively. Efficiency of proposed antenna is 90%. 4. CONCLUSION A Novel compact CPW-fed printed dipole antenna for UHF RFID and WIRELESS LAN applications has been designed by using Advance Design System software. The proposed CPW-fed printed dipole antenna exhibits an impedance matching. The resonant frequency 2.53GHz and 5.1/5.2 GHz achieved with low return loss that is -14 db and -19 db respectively. In this proposed antenna have high gain, directivity and efficiency. ACKNOWLEDGEMENT This work was supported by the All India Council for Technical Education Research Promotion Scheme of India.

7 A Novel Compact CPW-FED Printed Dipole Antenna for UHF RFID and Wireless LAN Applications 433 REFERENCE [1] Jyoti Ranjan PANDA, Aditya Sri Ram SALADI, Rakhesh Singh KSHETRIMAYUM A Compact Printed Monopole Antenna for Dual-band RFID and WLAN Applications, radioengineering, vol. 20, no. 2, p.p ,2011. [2] O. Ma and W. X. Zhang, "Broadband CPW-fed RFIO antenna at 5.8GHz," Electron. Lett. vol. 42, no. 22, pp , Oct [3] O. E. Brown, RFlD Implementation, New York: McGraw-Hili, [4] R. N. Simons, Coplanar Waveguide Circuits. Components and Systems,New York: John Wiley and Sons, [5] G. Marrocco, "Gain-optimized self-resonant meander line antennas for RFIO applications," IEEE Antennas Wirel. Propag. Lett. vol. 2, pp , [6] S. K. Padhi, N. C. Karmakar, C. L. Law, "An EM-coupled dualpolarized microstrip patch antenna for RFIO applications," Microw.Opt. Technol. Lett. vol. 39, pp , [7] W. C. Liu, "A coplanar waveguide-fed folded-slot monopole antenna for 5.8 GHz radio frequency identification application," Microwave Opt. Technol. Lett. vol. 49, no. I, pp , Jan [8] MA, D., ZHANG, W. X. Broadband CPW-fed RFID antenna at 5.8 GHz. Electron. Lett., 2006, vol. 42, no. 22, p [9] LIU, W. C. A coplanar waveguide-fed folded-slot monopole antenna for 5.8 GHz radio frequency identification application.microwave Opt. Technol. Lett, 2007, vol. 49, no. 1, p [10] Advanced Design System (ADS) , Agilent Technologies, USA.