- Open Access
- Authors : Prasad Bhilegaonkar , Saurabh Bansod
- Paper ID : IJERTV10IS060058
- Volume & Issue : Volume 10, Issue 06 (June 2021)
- Published (First Online): 11-06-2021
- ISSN (Online) : 2278-0181
- Publisher Name : IJERT
- License: This work is licensed under a Creative Commons Attribution 4.0 International License
A Compact Hybrid Fractal Antenna using Koch and Minkowski Curves for Wireless Applications
1 Prasad Bhilegaonkar
Lecturer, Department of Electronics, Government Polytechnic Ambad Dist. Jalna India.
2 Saurabh Bansod
National Institute of Information Technology Aurangabad, India.
Abstract: A compacted Hybrid Fractal multiband antenna using Koch and Minkowski Curves proposed in this paper for wireless applications. The Hybrid Fractal techniques is used to miniaturization of antenna. Koch curve improves the impedance bandwidth. Minkowski fractal curve gives its contribution to make antenna multiband. By adding the Circular SRR structure at side of Hybrid fractal patch antenna to improve both gain and bandwidth. It has compact size is 34 mm Ã— 34 mm Ã— 1.6 mm3. The suggested antenna has been design on FR4 substrate with r =4.4 with 1.6 thickness. The proposed antenna resonates at four frequencies 2.48GHz, 3.16GHz, 4.80GHz, and 5.64GHz. The bandwidth of antenna getting 160MHz, 85MHz,100MHz and 220MHz at 2.48GHz, 3.16GHz,4.80GHz and 5.54GHz
respectively. The peak gains of the proposed antenna in these frequency bands vary from 4.0 to 6.5 dBi. All the four band has VSWR less 1.6.
Keywords Hybrid Fractal, Multiband, Minkowski fractal, SRR, and WLAN.
Currently, wireless communication system has played a very significant role in our day-to-day life. Therefore, antennas premeditated for wireless applications have fascinated considerable attention from investigators and academics around the globe. Multi-frequencies antennas devices can offer many receptions and transmission functionalities. It is consequently considerable wanted to have a single antenna by means of a single feed point that covering several different frequency bands. The premeditated antennas are predictable to be solid small and easy to handle and can be well combined with several telecommunication devices. The fabricated antenna is famous for its compression size, not expensive, comfort to industrial and effortlessness of incorporation with other circuits [1-3].
In WLAN and WiMAX communication system, the antenna has been considered as the main part because its performance will straightly influence on the excellence of the wireless communications. Furthermore, the best antenna is the antenna that can be handle many applications by using only a single substrate to reduce the size used. In recent years, some multiband for WLAN and WiMAX applications have projected to design.
The compactness practice is one of the most appropriate trends for wireless devices as it develops resulting future generation of antennas for these applications which desired in numerous frequencies focused. In other hand, the fractal geometry also is one the favorite technique used that permits us to strategies a small antenna that easy to
integrate multiple telecommunication services into single devices.
There are several designs that apply the Minkowski fractal patch antenna such as in this paper of Hota. In his paper, the Minkowski patch effect to create the multiband effect to the antenna compare with the basic geometry design. This antenna achieves the resonant frequency at 6.32 GHz, 7.048 GHz, 8.448 GHz, 9.176 GHz, 9.68 GHz, 10.856 GHz
and 11.92 GHz, respectively . In other work, Dalmiya had been propose a Minkowski fractal antenna to create a multiband effect at several operating frequencies at 8.8 GHz,
10.8 GHz, 13.02 GHz and 15.23 GHz with reflection coefficient – 17.224 dB, – 22.604 dB, – 15.675 dB and –
dB, respectively . Nelaturi in 2016 had been design a compact Minkowski fractal antenna with high impedance surface (HIS) structure that effect dual resonant frequencies with bandwidth of 13.01 % and 4.95 %, respectively . Lastly, dual band antenna had been exist effected by the Minkowski fractal structure. This antenna resonates at 1.228 GHz and 1.5745 GHz. This Minkowski structure also effect to reduce 38 % of size compare with the basic patch antenna design . Shafie in his design had been introduce a modified Minkowski fractal antenna that creates a tri-band application at WiMAX 2.3 GHz, Wireless LAN 2.45 GHz and Hyper LAN 5.2 GHz . Suganti in his paper also used the same technique for his planar Minkowski fractal antenna that effect to resonate at 4.8 GHz, 6.0 GHz and 8.0 GHz . Beside that, there are others work of antenna that apply this Minkowski fractal structure in this several papers of [10-12].Meanwhile the metamaterials were introduced, academically categorized, and experimentally realized, previous researcher and engineers have exasperated several methods to bring these special features characteristics into applied application. Split ring resonator (SRR) is one of the examples metamaterial structure that used to the antenna design. There are not many examples previously on the antenna design that apply rhombic structure of SRR.Basically, before this, the researcher is using the basic structure of edge-couple SRR or other SRR structure [13-15].
In this work, the multi-band hybrid fractal patch antenna with Circular SRR has been functioning in four different frequencies at 2.46 GHz, 3.18GHz, 4.80GHz and 5.60 GHz for WLAN and WiMAX application. The methods apply in this paper are Minkowski fractal patch structure with circular SRR on the substrate.
This section focusses on the simulation design comprises with the basic structure of circular SRR and lately of the Minkowski-Koch hybrid fractal patch with circular SRR. This design is simulated using HFSS Software. The circular SRR has been attached at the upper part of the FR-4 substrate. The position of this circular SRR is at every corner of the Minkowski-Koch hybrid fractal patch antenna. Figure 1 show the circular split ring structure and Table I shows the structure of circular SRR with its dimension. The radius of the circular SRR at inner ring is R2=2.0 mm and outer ring are R1=3.0 mm. The gap amongst SRR is 1.00 mm.
Fig.1.The SRR using circular structure
Figure 2 iteration-wise stage of the Minkowski-koch Hybrid fractal patch antenna. These five stages that founded are – iteration 0th, iteration 1st, iteration 2nd, iteration 3rd and iteration 3rd with SRR.The length of patch (L) at resonant frequency of 3.4GHz has been calculated by using the below equations.
(a) (b) (c) (d) (e)
Fig. 2. Design steps of the multiband Hybrid Fractal antenna
0th iteration (b) 1st iteration (c) 2nd iteration (d) 3rd iteration (e) 3rd iteration with circular SRR
This proposed Minkowski-Koch hybrid fractal patch antenna with circular SRR has been design on substrate of FR-4 with dielectric constant, r = 4.4. The dimension substrate of the proposed hybrid fractal antenna with circular SRR is 34.0 mm substrate width and 34.0 mm substrate length. The thickness of this substrate is 1.6 mm. The copper cladding thickness for patch and ground plane is 0.070 mm. The proposed Minkowski-koch hybrid fractal patch antenna with circular SRR as illustrated in Figure 3.
Fig.3. Geometry of the proposed Hybrid Fractal multi band antenna (a) Top View (b) Side View
Table I displays the optimized dimension of the Minkowski- koch hybrid fractal patch antenna. In this case, this design containing of three different parts – Minkowski-koch fractal patch, feed point and circular SRR. The Minkowski-koch hybrid fractal patch antenna part has been situated at the above part of feed line. The size of this part is 23.0 mm widt x 25.0 mm length. The feed point location is (X=5,Y=5).
Table 1: Optimized Parameter Values
RESULTS AND DISCUSSION
This section shows otherwise performance results of proposed hybrid fractal antenna structure. Several constraints that are measured in this effort are resonant frequency, Return Loss, VSWR, bandwidth and gain of the antenna.
Figure 4 illustrate the return Loss of Minkowski fractal patch antenna with circular SRR structure. Firstly, it conclude that for zero iteration is at 3.38 GHz of resonant frequency with –
12.91 dB of return loss. The resonant frequency of first iteration shifted to lower side at 3.24 GHz frequency with –
dB of return loss. The second iteration got two frequency are 2.88 GHz, 3.70 GHz with a respective return Loss of -32.48 dB, -21.42 dB. The final design has been done in third iteration with SRR. The three resonant frequency of 3rd iteration design are at 2.60 GHz, 3.32 GHz and 5.82 GHz with -19.54 dB, -18.05 dB and -14.15 dB.
Fig 4: Simulated return loss characteristics of iteration-wise fractal antenna
Finally By circular SRR added to the 3rd iteration design, it develops a new resonant frequency at 4.80 GHz equated to the third iteration without SRR that only have only three resonant frequencies. The graph clearly represents the different type of stage will control where the resonant frequency.
Fig 5: Simulated return loss of proposed fractal multiband antenna
From Figure 5 shows the return loss of proposed fractal multiband antenna. It can observed that four resonant frequency are at 2.48 GHz, 3.16 GHz, 4.80 GHz and 5.66 GHz with values are -16.41,-19.98 dB, -13.40 dB and -28.10 dB respectively. Hybrid Fractal plays significant role in achieving multiband frequency characteristics.
Fig 6: Simulated VSWR of proposed fractal multiband antenna
Figure 6 shows that VSWR of proposed fractal antenna, it is found that the VSWR value is 1.35, 1.22, 1.54 and 1.08 at freq of 2.4 GHz, 3.1GHz, 4.8GHz and 5.6GHz with bandwidth 160MHz, 85MHz, 100MHz and 220 MHz respectively.
Fig. 7. Radiation Patterns of proposed antenna at (a) 2.45 GHz
The figure 7 (a) shows Radiation Patterns of proposed antenna at 2.45 GHz in E and H-plane. Here, the simulated radiation pattern in H Plane and E plane is directional radiation Pattern in both Planes for all bands.
Fig.8 Surface current distributions (a) 2.45GHz (b) 5.65GHz
The current distribution of the proposed fractal multiband antenna at 2.45 GHz and 5.65GHz is presented in Figure 8. It can be seen that strong surface currents are distributed over the edge of patch antenna.
Fig. 9. 3D Gain of the proposed Fractal antenna at 2.45GHz
Table II characterize the Return loss, resonate frequency and other parameters from 2.0 GHz to 6.0 GHz frequency range of proposed antenna (0th iteration, 1st iteration, 2nd iteration, 3rd iteration without CSRR and 3rd iteration with CSRR). The third iteration without CSRR shows the low bandwidth and
gain performance all freq bands. It shows that in third iteration with CSRR, it added fourth frequency band. Also effect to increase the both bandwidth and gain of the proposed hybrid fractal patch antenna. The gain value is increased up to 0.8dB all frequency bands.
Shape of MSA
3rd iteration without CSRR
3rd iteration with CSRR Proposed fractal
Table 2: Comparison Table of Antenna Evolution Process
A compact antenna with multiband characteristic is designed using hybrid fractal with SRR technique for Wireless Applications. The performance characteristics of proposed hybrid fractal antenna are sound as compared to single curve fractal antennas. The overall size of antenna is very small 34Ã—34Ã—1.6 mm3. From the simulation, it shows that the Hybrid Fractal Antenna has been produced a Multiband of resonant frequencies at 2.48 GHz, 3.16 GHz,4.80 GHz and
GHz.The third iteration with circular SRR design successfully to enhance the gain equated with third iteration design. The mixture of the fractal geometry and SRR had been making the size antenna reduced, gain amended and produce multiband of frequency. Proposed antenna resonates at multiband frequencies and its Radiation pattern is stable all the four frequency bands with good gain. The proposed fractal antenna can be used for various applications like Bluetooth, Wi-Fi, WLAN, LTE and WiMAX.
H. Lee, H. Nam and Y. Lim, "A design of printed square loop antenna for omni-directional radiation patterns," Proceedings Radio and Wireless Conference 2003 (RAWCON '03), pp. 253-256, 2003
M. M. Islam, M.T. Islama, and M. R. I. Faruque, "Design of a triple frequency band patch antenna on FR4 substrate material," 2013 IEEE International RF and Microwave Conference (RFM2013), pp. 349-352, 2013.
S. Jadhav and P. M. Veeresh, Design and Implemntation odf Rectangular Microstrip Patch Antenna for 2.4 GHz Wireless Applications, Imperial Journal of Interdisciplinary Research, vol. 3, pp. 325-328, 2017.
S. Hota, G. P. Mishra and B. B. Mangaraj, "Design and performance study of modified Minkowski Island Fractal patch antenna for various wireless communications," 2017 InternationalConference on Inventive Computing and Informatics (ICICI), pp. 849-855, 2017
A. Dalmiya and O. P. Sharma, "A novel design of multiband Minkowski fractal patch antenna with square patch element for X and Ku band applications," 2016 International Conference on
Recent Advances and Innovations in Engineering (ICRAIE), pp. 1-6, 2016,
S. Nelaturi, D. Vakula and N. V. S. N. Sarma, "HIS based dual band dual polarized Minkowski fractal patch antenna," 2016 Asia-Pacific Microwave Conference (APMC), pp. 1-4, 2016,
T. N. Cao and W. J. Krzysztofik, "Hybrid Minkowski fractal island antenna operating in two bands of GPS satellite system," 2016 IEEE International Symposium on Antennas and Propagation (APSURSI), pp. 211-212, 2016
S. N. Shafie, I. Adam and P. J. Soh, "Design and Simulation of a Modified Minkowski Fractal Antenna for Tri-Band Application," 2010 Fourth Asia International Conference on Mathematical/Analytical Modelling and Computer Simulation, pp. 567-570, 2010
S. Suganthi, K. S. Tharini, P. S. Sarankumar, S. Raghavan and D. Kumar, "Design and simulation of planar Minkowski fractal antennas," 2011 2nd International Conference on Wireless Communication, Vehicular Technology, Information Theory and Aerospace & Electronics Systems Technology (Wireless VITAE), pp. 1-5, 2011
E. C. Lee, P. J. Soh, N. B. M. Hashim, G. A. E. Vandenbosch, V. Volski, I. Adam, H. Mirza, M. Z. A. A. Aziz, Design and Fabrication of a Flexible Minkowski Fractal Antenna for VHF Applications, Proceedings of the 5th European Conference on Antennas and Propagation (EUCAP), pp. 521-524, 2011.
A. Wahid, M. K. A. Rahim, F. Zubir, Analysis of Dual Layer Unit Cell with Minkowski Radiating Shape for Reflect array Antenna on Different Substrate Properties, 2010 IEEE Asia- Pacific Conference on Applied Electromagnetics (APACE 2010), pp. 1-5, 2010.
J. -C. C. Liu, C. -P. Kuei, C. -C. C. Chang, H.-H. Liu, Dual- Mode Wide-Band and Dual-Band Resonators with Minkowski-Island- Based Fractal Patch for WLAN Systems, Cross Strait Quad- Regional Radio Science and Wireless Technology Conference (CSQRWC), pp.583 – 585, 2011.
V. Sharma, N. Lakwar, N. Kumar and T. Garg, "Multiband low-cost fractal antenna based on parasitic SRRs," in IET Microwaves, Antennas & Propagation, vol. 12, no. 6, pp. 913-919, 2018.
M. K. A. Rahim, H. A. Majid and T. Masri, "Microstrip antenna incorporated with left-handed metamaterial at 2.7 GHz," 2009 IEEE International Workshop on Antenna Technology, pp. 1-4,2009,
H. A. Majid, M. K. A. Rahim and T. Masri, "Left handed Metamaterial design for microstrip antenna application," 2008 IEEE International RF and Microwave Conference, pp. 218- 221, 2008,
H. Nornikman, B. H. Ahmad, Z. Zakaria, N. E. S Ramlee, M. Z. A. Abd Aziz and M. K. Ismail, "Multiband Minkowski Fractal Patch Antenna with Rhombic SRR for Wireless LAN and WiMAX Applications," 2018 IEEE International RF and Microwave Conference (RFM), Penang, Malaysia, 2018, pp. 85-88.
Y. B. Chaouche, M. Nedil, B. Hammache and M. Belazzoug, "Design of Modified Sierpinski Gasket Fractal Antenna for Tri-band Applications," 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, Atlanta, GA, USA, 2019, pp. 889-890.
Zhen Yu, Jianguo Yu, Xiaoying Ran, Chenhua Zhu, "A Novel Ancient Coin-Like Fractal Multiband Antenna for Wireless Applications", International Journal of Antennas and Propagation, vol. 2017.
S. Subramanian and B. Sundarambal, "Compact Micro Strip Fed Koch Fractal Monopole Loop Antenna For Multiband Performance," 2020 6th International Conference on Advanced Computing and Communication Systems (ICACCS), Coimbatore, India, 2020, pp. 1438-1439.
Z.-W. Yu, G.-M. Wang, X.-J. Gao, and K. Lu, "A Novel Small-Size Single Patch Microstrip Antenna Based on Koch and Sierpinski Fractal-Shapes," Progress In Electromagnetics Research Letters, Vol. 17, 95-103, 2010