A Single Band Notched CPW Antenna Design - IEEE Xplore

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2Department of Physics, Dr B R Ambedkar National Institute of Technology, Jalandhar, Punjab. E-mail : [email protected] & [email protected].
2012 International Conference on Computer Communication and Informatics (ICCCI -2012), Jan. 10 – 12, 2012, Coimbatore, INDIA

A Single Band Notched CPW Antenna Design 1 2 2 Harish Kumar Upadhayay M.D, SM. Amita Thakur, Aanchal Agarwal, & Navdeep Singh ,Sarabjeet Singh 1 Dept. of ECE.,Bhagwant Institute of Technology, Muzaffarnagar 2 Department of Physics, Dr B R Ambedkar National Institute of Technology, Jalandhar, Punjab. E-mail : [email protected] & [email protected]

Abstract- A single band notched Coplanar Waveguide Antenna using complementary split ring resonators is proposed and investigated which is working on WLAN and C-Band applications. The proposed antenna can reject single frequency band by etching Circular Split Ring Resonators (CSRRs) on the radiating patch. The single stop band of the proposed CPW antenna are 4.6GHz- 5.3GHz with a reference level of Sn = -10 dB. The center frequency of the first notched band is 5.0GHz at which the wireless WLAN (Upper WiFi) service is assigned. The proposed antenna operates from 2482 MHz to 2984 MHz for voltage standing wave ratio (VSWR) less than 2, except one frequency notched band of 4.6GHz-5.3GHz Key words: CPW Antenna, Band Stop and Band Pass, Split Ring Resonator, Circular Patch.

I. INTRODUCTION The important problem in microwave system is Electromagnetic Interference which is caused by harmonic radiation in most cases i.e. in active integrated microstrip antenna systems. The suppression of spurious and harmonic bands in the microwave devices and systems has been developed for decades. For eliminating spurious and harmonics modes, many methods, where various devices or structures are employed such as low-pass filter [1], band-pas filter [2], Electromagnetic Bandgap structures (EBGs) [3], and Defected Ground Structures (DGS) and other metamaterial structures [8] were investigated. Another circular planar antennas were also discussed [6] along with these metamaterial like UC-PBG structures which are planar metamaterial structures which has been studied along with their effect on planar antenna configuration [9]. However, cascade or open stub type of filter needs an additional length. EBG structure is bulky in the low frequencies and band-pass ripple [4]. Therefore, we have applied split ring resonators (SRRs) that have advantages of no additional length and no band-pass ripple to suppress spurious modes of patch antenna. Also Split Ring resonator structures are Planar Structures in which no via is used like mushroom structures .SRRs for negative permeability in certain frequency range were investigated by J. B.

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Pendry et al. in 1999 [5]. Thereafter, coplanar waveguide type of band-pass filter using CSRRs and periodic thin wire is reported. Only CSRRs that are etched on microstrip for coupling perpendicular magnetic field has band-stop characteristic in the resonant frequency due to negative permeability characteristic. As a result, radiation in the spurious modes is removed.

II ANTENNA DESIGN The configuration of standard CPW antenna without CSRR and with CSRR structure is shown in figure 1 and 4 respectively. It is fabricated on RO4232 (ℇr=3.2, tan δ=.0018) with a thickness of 0.762 mm. L and W denote the length and width of the dielectric substrate respectively which are constant at 40mm and 35mm here. A circular patch and 50 Ohm microstrip feed line are printed on the same side of the substrate. The ground plane consists of Circular Split Ring Resonator structure which is exactly below circular patch for improving antenna efficiency. The radius of circular patch is P= 16 mm which is enclosed in metallic strip of width W1=2 mm as shown in figure l by dark brown area. In this antenna CSRR is etched on circular patch of antenna and this CSRR is planar structure without via which is included in the category of metamaterial as shown in figure 4. The value of S1 = 15.1 mm and S2= 0.4 mm. The width of the microstrip feed line is fixed at W1=4 mm to achieve 50 Ohm impedance. The values of L1 =2.25 mm. It is shown in Figure 3 that Circular Split Ring Resonator is designed by etching circular slots on patch. The physical dimensions of CSRR structure here are R1=8.0 mm, R2=6.0 mm, R3=4.0 mm, R4= 2.0 mm, g1= 1.0 mm, D1= 1.0 mm and S1= 1.0 mm in order to remove one frequency band from return loss value curve.

2012 International Conference on Computer Communication and Informatics (ICCCI -2012), Jan. 10 – 12, 2012, Coimbatore, INDIA

Fig 3(a). Radiation pattern at 2.8 GHz of Standard antenna design (X-Y plane).

Fig 1. Geometry of CPW based Standard antenna design. -Parameters -6 -8 -10 -12 -14 -16 -18 -20 -22 4000

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Fig 3(b). Radiation pattern at 2.8 GHz of Standard antenna design (Y-Z plane).

Fig 2. S11 value of Standard CPW antenna design frequency in MHz 1: [email protected] 2: [email protected] 3: [email protected] 7 9 4: [email protected] 5: [email protected] 6: [email protected] 7: [email protected] 8: [email protected] 9: [email protected] ./sub-1/s1_1 8 Fig 3(c). Radiation pattern at 2.8 GHz of Standard antenna design (Z-X plane).

2012 International Conference on Computer Communication and Informatics (ICCCI -2012), Jan. 10 – 12, 2012, Coimbatore, INDIA

Radiation patterns of antenna with or without CSRR structures are shown in figures 3(a), 3(b) and 3(c) and figures 6(a), 6(b) and 6(c) respectively. Figures 3(a) and 3(b) represents null values at endfire directions. Figure 3(c) represents null values at endfire as well as broadside direction at resonant frequency of 2.8 GHz.

6: [email protected] ./sub-1/s1_1 Fig 5. S11 value of CPW antenna design with CSRR.

Fig 6(a) Radiation pattern (Phi= 0o, Theta varying)(ZX Plane) at 2.7 GHz of antenna with CSRR. Fig 4. Geometry of CSRR based proposed antenna design S-Parameters -5 1: 2: -10 3:

1 3

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-15 5: 6: -20

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-30 2000 3000 4000 5000 6000 7000 8000 900010000 frequency in MHz 1: [email protected] 2: [email protected] 6 3: [email protected] 4: [email protected] 5: [email protected]

2012 International Conference on Computer Communication and Informatics (ICCCI -2012), Jan. 10 – 12, 2012, Coimbatore, INDIA

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Fig 6(c) Radiation pattern (Theta= 0o, Phi varying) at 2.7 GHz of antenna with CSRR.

III. CONCLUSION By etching rings of CSRR (Circular Split Ring Resonator) structure on circular radiating patch of CPW antenna we can easily achieve harmonic suppression which is common in modern wireless communication system for avoiding frequency bands. This antenna is working in WiMax and C-Band applications. REFERENCES [1]

[2]

M. Q. Lee, K. K. Ryu, I. B. Yom, and S. P. Lee, "Low pass filter for spurious suppression," Electronics Letters, Vol. 38, No. 5, 2002. S. F. Chang, Y. H. Jeng, and J. L. Chen, "Tapped wigglycoupled technique applied to microstrip bandpass filters for multi-

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octave spurious suppression," Electronics Letters, Vol. 40, No. 1, 2004. S. K. Padhi and N. C. Karmaker, "Spurious harmonics suppression of tapered SIR band-pass filter using electromagnetic bandgap (EBG) structure, Ant. Propag. Soc. Symp., Vol. 4, 2004. J. Garcia, F. Martin, F. Falcone, J. Bonache, I. Gil, T. Lopetegi, M. A. G. Laso, M. Sorolla, and R. Marques, "Spurious passband suppression in microstrip couled line band pass filters by means of split ring resonators, " IEEE Microwave and Wireless Components Letters, Vol. 14, No. 9, 2004. J. B. Pendry, A. J. Holden, D. J. Robbins, and W. J. Stewart, "Magnetism from conductors and enhanced nonlinear phenomena,” IEEE Trans. on MTT, Vol. 47, No. 11, 1999. Harish Kumar, Garima Chandel, Upadhayay MD, “Study on Circular Planar Antenna”, MMS 2010: proc. 10th Mediterranean Microwave Symposium, North Cyprus Aug 23-27, 2010.pp73-76 Harish Kumar, V.K Sharma and Navdeep Singh, “ Slot antenna for frequency switchable active antenna,” Proc. in IEEE,13th International conference advanced communication Technology (ICACT-2011), Vol.2 pp 921-924, 13-16 Feb 2011. Singh, N.; Singh, S.; Kumar, Harish.; “A study on applications of Meta-Material based Antennas” Proc. IEEE 3rd International conference on Electronics & Computer

Technology (ICECT-2011),Vol.1, pp 189- 192, 08-11 April 2011. [9] Singh, N.; Singh, S.; Sarin, R.K.; “Effect of Photonic Band Gap structure on Planar Antenna configuration” MMS 2010: proc. 10th Mediterranean Microwave Symposium, North Cyprus pp 81-85, Aug 23-27, 2010. [10] Rajeev Kanth, Harish Kumar, Pasi Liljeberg, Lrong Zeng, “Life cycle assessment of printed antenna competitive analysis environmental impact evolution,”Proc. in IEEE International Symposium on sustainable system & Technology (ISSST-2011) Chicago, USA, pp01, 16-19 May,2011.