Multiband Fractal Antenna : Application to Wi-Max

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International Journal of Electronics Communication and Computer Engineering Volume 7, Issue 1, ISSN (Online): 2249–071X, ISSN (Print): 2278–4209

Multiband Fractal Antenna : Application to Wi-Max

Miss. Awalekar Madhavi J., Mrs. S. R. Mahadik

Abstract – In this paper configuration of multiband fractal antenna for Wi-Max application is presented and analyzed. Three circle triangle iterations are configured and observed. The feeding method used for antenna is CPW (co-planar waveguide)feed. To provide the Wireless technologies like Wi-MAX and other advanced applications through the antennas by using Fractal technology to the microstrip antennas. By using the fractal technology on the microstrip antennas we can get several advantages like wide band operation, less power consumption, less return loss and many more. The antenna characteristics were simulated using full-wave electromagnetic simulator (IE3D). According to simulations, the proposed antenna can provide proper response at 2.4 GHz for third iteration. Return loss values according to simulated results obtained at 2.4GHz Simulated and practically are -15.8db,-11.5db respectively and VSWR values are practical 1.5 and 1.95 respectively.

Keywords – Fractal , CPW, Return loss, VSWR.

I. I

NTRODUCTION

To provide the Wireless technologies like WiMAX and other advanced applications through the antennas by using Fractal technology to the microstrip antennas. By using the fractal technology on the microstrip antennas we can get several advantages like wide band operation, less power consumption, less return loss and many more. To handle the most advanced wireless technology like WiMAX it‟s better to have the more flexible antennas like Fractal antennas. The two properties of the fractal antenna such as Self-similarity and Space-filling are making the fractal antennas for wide application. At GHz frequency the antenna which gives maximum gain with less return loss & VSWR. The design of the fractal antenna for such a practical applications should be made carefully so as to exhibit the desirable characteristics of the antenna like gain, bandwidth, directivity, return loss, VSWR etc. To have the maximum gain, bandwidth, directivity etc it‟s better to design the antenna using the fractal technology. To increase the bandwidth a Co-Planar Waveguide (CPW) feed is used. By using such feeding technique the bandwidth of the antenna can be increased to the ratio of 6:1.The new compact Multi-Band antenna has been presented and implemented successfully by fractal technology. So that the most advanced wireless applications like Wi-MAX can be achieved by proper selection of substrate, feeding technique and proper design procedure. The three iterations of circle-triangle CPW antenna are used.

II. D

ESIGN AND

I

MPLEMENTATION

Fig. 1. CPW fractal antenna all three iterations

The Length is 39mm, Width is 43mm, Dielectric constant=4.4, thickness= 1.6 mm, tan δ_=0.001.

Fig. 2. The IE3D design of 3rd Iteration

Fig. 3. Hardware of all three Iterations

The antennas were simulated using full-wave electromagnetic simulator (IE3D). Figure 2 shows the simulated return loss against frequency for the proposed wideband dual frequency slotted antenna. It is clearly seen that simulated resonant frequency is 2.4GHz. is excited with good impedance matching.

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Fig. 4. Simulation Return loss results of 3rd Iteration

The VSWR values according results obtained at 2.4GHz Simulated and Practically are 1.5, 1.95

Fig. 5. VSWR results of 3rd Iteration

III. C

URRENT

D

ISTRIBUTION

Fig. 6. Current Distribution results of 3rd Iteration

IV. A

PPLICATIONS

The fractal antennae that have the multiband operation due to the self-similar property in fractal geometry, which plays a key role to create a fractal circular monopole patch antenna. The other important property that is,Space-filling property which actually determines the reduction in the size of the antenna. This property adds more electrical length in less volume which reduces the size of the antenna. Based on these two properties the fractal antennas are designed. These two properties of fractal geometry making the fractal antenna to apply for several advanced applications.

The CPW feed also helps the antenna to achieve the bandwidth in the ratio of 6:1.Though it is difficult to construct a CPW feed for an antenna, but it exhibits wider bandwidth. Monopole fractal antenna and implemented to effectively support mobile worldwide interoperability for microwave access (Mobile Wi-MAX),and Wi-MAX which operate in the 2.3/2.5 GHz (2.305–2.360 GHz/2.5– 2.69)GHz.

IV. C

ONCLUSION

The DWesigning of Multi-band or wide band antenna is the main challenge in wireless commutation system application due to bandwidth requirements. In this paper, a new model of Microstrip multiband antenna using fractal geometries having better performance is designed. It is estimated that the antennas presented in this paper may have lot of applications in wireless communications. Simulation results show that the modeled fractal antennas have Wi-MAX frequency bands have been designed and simulated on FR4 substrate successfully. The frequency of 2.4GHz. At this frequency we get Return loss < 10dB and VSWR < 2.

V. R

EFERENCES

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ROFILE

Miss. Madhavi J.A.

I s p u r s u i n g M E i n E l e c t r o n i c s a n d Telecommunications from Dr. J.J.Magdum college of Engineering, Jaysingpur. She has completed her B.E(Electronics& Telecommunications) from S.S.P.M college of engineering Kankavli, Maharashtra, India. She is working as a Assistant Professor at V.S.M.’s College of Engineering, Nipani, Tal-Chikodi, Dist-Belgaum. She has a Teaching experience of 3.5 years.

Prof.Mrs.S.R.Mahadik

Is pursuing Ph.D in Active Microstrip antennas from Shivaji University Kolhapur. She has c o m p l e t e d h e r M . E ( E l e c t r o n i c s & C o m mu n i c a t i o n s ) f r o m K . I . T c o l l e g e o f

engineering Kolhapur, Maharashtra, India She is