Modal Analysis and Design a planar Elliptical Shaped UWB antenna with Triple Band Notch Characteristics

Abstract A Planer CPW fed UWB monopole antenna with triple band notch characteristics is presented in this paper. Modal analysis of band-notched UWB antennas illustrates the existence of resonant modes linked to the embedded narrowband slot structure (slot modes), whose location within the planar geometry of the monopole determines the effect over the rest of the radiating modes of the wideband structure, and consequently, over the behavior of the antenna. The proposed antenna could potentially minimize frequency interference from many underlying technologies i.e. WLAN, WiMAX and Aeronautical mobile bands. The U slot that is etched out from the radiator results in creating band notch centered at 3.5GHz and 10.5 GHz. The band notch centered at 5.5GHz is obtained by L shape slots etched from the ground plane. The dimensions of proposed antenna are 45 mm x 41 mm x 0.762 mm and the proposed antenna is realized on Taconic substrate with r = 2.2. The impedance bandwidth of the proposed antenna covers the frequency range from 2.8 GHz to 12 GHz. The simulated gain is 4.93dBi. Keywords Band-notched, UWB Antenna, characteristic modes, planar monopole.

I. INTRODUCTION Recently wireless communication system research and development in UWB has increased. To efficiently use scare frequency spectra, an FCC allocation of 3.1 to 10.6GHz [1] for UWB has created interest in antennas with extremely wide bandwidths. For UWB systems, printed monopole antenna with various designs have been studied which meet the frequency range specified for UWB communication [2-7]. Printed monopole antenna designs with enhanced bandwidths for multiple wireless systems have been proposed recently. However, it is also necessary to avoid potential interference with various narrow band communication systems which are within UWB frequency range. In this paper an elliptical shaped printed monopole antenna with triple band notch characteristics is proposed. A micro strip fed antenna with an L shaped ramification on the ground plane has been presented in [8] for WLan and UWB system and U shape slot ramification on the feed line has been presented in [9-10] for Wimax and aeronautical. A printed elliptical antenna with a tapered and modified feed was designed to support a number of wireless communication frequency bands [11]. On the other side, the FCC designed notch band for ultra wide band system, there exits various narrow frequency bands used by other wireless systems such as Wimax (3.3GHz-3.7GHz), WLan (5.15GHz- 5.825 GHz), satellite communication (7.25 GHz-

7.75GHz). For example, slots of various shapes made in a patch can supply only one notch bands, and their practical applications are limited. There are some designs with the characteristics of a triple notch band [14] are presented [15].

The proposed paper illustrates a band notch antenna with various slots. The notch band at 3.5GHz and 10.5GHz is achieved by using U slot on the feed line, the notch band at 5.5GHz is achieved by using L shape slot on the ground plane. The design antenna produces a bandwidth 9.4 GHz with three different notch bands at 3.5GHz, 5.5GHz and 10.3GHz respectively.

The paper is arranged such that section 2 describes the details of the design and parametric study, which is followed by result and discussion and conclusion in section 3 and section 4 respectively

II. ANTENNA DESIGN The geometry of the proposed antenna is shown in fig. 1. The proposed antenna is perceived on Taconic substrate =2.2, thickness 0.762mm. The radiator patch consists of an elliptical feed by a 50 ohm coplanar waveguide line.

The antenna is simulated using time domain solver of CST Microwave studio [12]. Two symmetrical L-shape slots in the ground planes results in notch band at 5.5GHz. The U shape slot is cutting the feed line to create a Wimax and aeronautical

Fig.1. Geometry of the antenna (units in mm) (a) top view

Satyabrata Maiti1, Naikatmana Pani2, Amrit Mukherjee3 M Tech1, 2, School of Electronics Engineering, KIIT University, Bhubaneswar, INDIA

satyabratamaiti12@gmail.com, naikatman@gmail.com, amrit1460@gmail.com

13978-1-4799-3140-8/14/$31.00 c2014 IEEE

ADMINTypewritten TextDOI - 10.1109/ICSPCT.2014.6885032

rejection band centered at 3.5GHz and 10.3 GHz. The total length of the U slot is deducted from (1) and (2).

L_U=2 S2+2 S1 (1)

Where f1 in (1) and (2) are frequencies 3.5GHz and 10.3GHz respectively. Another notch band at 5.5GHz is created using two symmetrical L shape slots in the ground planes as shown in fig. The total length of the L slot is derived from (3) and (4).

L_S=L1+L2+Ts2 (3)

Where in f2 stands for 5.5GHz.

The Optimized antenna parameters are listed in table 1 Antenna

Parameter Lsub Wsub Lg wp LP W0 Wg

Value (mm) 41 45 20.75 0.43 0.75 1.53 21.3 Slot

parameters RX RY L1 L2 Ts2 S1 S2

Value (mm) 13.5 9 13.5 8.2 0.45 0.7 20

III. RESULTS AND DISCUSSIONS

One of these technologies recently proposed is a band-notched technique. In this paper, we propose a compact ultra-wideband micro strip antenna with triple band notched 3.35 GHz, 5.5 GHz and 10.5 GHz. The proposed antenna consists of a rectangular patch with a partial ground plane that is fed by 50 micro strip lines. The proposed antenna is simulated using commercial software CST microwave studio [13]. The dimension of the antenna is 45mm x 41mm.The VSWR of the antenna is plotted in fig. 3. which shows a wide impedance bandwidth from 2.8GHz to 12GHz with three band notches 3.5GHz, 5.5GHz and 10.3GHz. The U shape slot resonates at frequencies 3.5GHz and 10.3GHz, which is clear from the current distribution depicted in fig (4. (a)) And fig. (4.(c)) respectively . Fig.4. (b) Which showing standing wave pattern due to high current density in the L shape slot. The antenna gain is shown in fig. 5. It shows that the gain is almost flat except at rejection frequencies where gain decreases abruptly. The peak gain is 4.93dBi.

efffcLL

22_

efffcUL

12_

Fig.3 Simulated VSWR of the antenna with three notch band

(a) (b)

(c) Fig.4. Surface current distribution (a) the first notched band, 3.5 GHz, (b) the second notched band, 5.5 GHz, (c) the third notch band 10.3GHz.

Fig.5. Maximum gain of the antenna

(a) (b) Fig.2. Geometry U shaped Slot. (c) Geometry of L shaped slot

(2)

(4)

14 2014 International Conference on Signal Propagation and Computer Technology (ICSPCT)

Moreover the distortion less nature of the antenna is confirmed by studying the group delay as shown in fig. 6. It observed that group delay excursion is within 1ns except notch frequencies. The radiation patterns at frequencies 3.5GHz, 5.5GHz, 7.5GHz, and 10 GHz of H- (x-z) and E- (y-z) planes are shown in Fig. 7. The antenna displays a good omnidirectional radiation pattern in the H-plane, even at high frequencies.

IV. CONCLUSION An elliptical shaped UWB antenna with triple band notch antenna using fractal slots is designed in this paper. The impedance bandwidth ranges from 2.8GHz to 12GHz. The U shaped slot which is responsible for band rejection at 3.5GHz and 10.3GHz. The band notch at 5.5GHz is achieved due to L-shaped slots in the ground planes. The radiation patterns are observed to be omnidirectional. The gain of the antenna shows satisfactorily 3.0dBi to 4.93dBi throughout with triple rejection bands. Moreover the antenna group delay profile remains within 1ns in the UWB system. The proposed Micro strip antenna is easily integrated with RF/microwave circuits for low cost manufacturing and suitable for various UWB applications.

REFERENCES [1] First Report and Order in the matter of revision of part 15 of the

Commissions Rules Regarding Ultra-wideband Transmission systems, Rules by FCC, ET-Dockot98-153, 2002.

[2] Zhang, Z. and Y. H. Lee, A robust cad tool for integrated design of UWB antenna system, Progess In Electromagnetics Research, Vol112, 441-457,2011.

[3] Jiang, W., T. ong, Y. Liu, S. Gong, Y. Guan, and S. Cui, A novel technique for radar cross section reduction of printed antennas, Journal of Electromagnetic Waves and Applications, Vol.24, No.1, 51-60,2010.

[4] Reddy, G. S., S. K. Mishra, S. Kharche, and J. Mukherjee, High gain and low cross-polar compact printed elliptical monopole UWB antenna loaded with partial ground and parasitic patches,"Progress In Electromagnetics Research B, Vol. 43, 151-167, 2012.

[5] Liang, X.L., SS Zhong, and W.Wang, Trapped CPW-fed Printed monopole antenna, Microwave Opt.Tech Lett., Vol.48, No.7, 1411-1413,2007.

[6] D. T. Nguyen, D. H. Lee, and H. C. Park, Very compact printed triple band-notched UWB antenna with quarter-wavelength slots, IEEE Antennas Wireless Propag. Lett., Vol. 11, pp. 411414, 2012.

[7] Saleem, R. and A.K.Brown, Empirical miniaturiazation analysis of inverse parabolic step sequence based UWB antennaa, Progress In Electromagnetics Research,vol.114.369-381,2011.

[8] Yildirim, B., B.A. Cetiner,.G.Roqueta, etal., Integrated Wimax and UWB antenna, IEEE antennaa and wireless Propag.Lett., Vol.8 149-152,2009.

[9] Zhu, F., S.-C. S. Gao, A. T. S. Ho, C. H. See, R. A. Abd- Alhameed, J. Li, and J.-D. Xu, Design and analysis of planar ultra-wideband antenna with dual band-notched function," Progress In Electromagnetics Research, Vol. 127, 523-536, 2012.

[10] R Ghatak, AKarmokar,D R poddar, Acircular shaped fractal UWB monopole antenna with Band Rejection Capability, Progress In Electromagnetics Research C,vol 24,221-234,2011.

[11] Liu, J.J., S.S. Zhong, and K.P. Esselle, Aprinted elliptical monopole antenna with modified feeding structurefor bandwidth enhancement, IEEE Trans.Antennas propag., Vol 59,No.2, 667-670,2011

[12] User Manual ,CST Microwave studio.2011. [13] F.Zhu, S Gao,A.T.S Ho, C.H. See, R.A. Adb-alhameed,J.Li and J.Xu,

Design and Analysis of plannar UWB antenna with dual band Notched function Progress In Electromagnetics Research,Vol,127,523-536,2012.

[14] S Maiti,A Gorai, R Ghatak, A CPW fed UWB Antenna with Triple band notch Characteristics using Multiple Fractal Slaots, MDDCT 2014,pp-112-116,2014.

[15] M. T .Islam,R Azim and A.T Mobashser, Triple band notched pnaler UWB antenna using parasitic strips, Progress In Electromagnetics Research, Vol.129, 161-179,2012.

Fig.6. Group Delay

(a)

(b)

(c)

(d)

Fig.7. Simulated radiation pattern in E-planes & H-planes at (a) 3.5GHz

(b) 5.5GHz(c) 7.5GHz (d) 10 GHz

2014 International Conference on Signal Propagation and Computer Technology (ICSPCT) 15

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