Compact Planar G-shape UWB Antenna with Notch characteristics for Satellite Communication

Abstract In this paper, a compact G-shape, ultra wide band microstrip fed antenna with band notch characteristics of satellite communication is proposed. The proposed antenna of a circular slot cuts in the patch to achieve a band notched characteristics in the satellite communication band (7.25-7.825 GHz). The antenna, which occupies a size of 45 36 1. 6 mm3.Surface current distribution to analyze the effect of slots. The gain of the proposed antenna varies from 0.5 dBi to 6.0 dBi. The group delay is found within 1ns expect notch band.

Keywords CPW fed, Ultra wide band, half wavelength slot, monopole antenna, Band notch.

I. INTRODUCTION The modern wireless communication system has been developed rapidly and dramatically during the last decade, which promotes, designs of the antennas in the systems to a new era. The UWB technology has become the most promising technology since the approval and allocation of the frequency band between 3.1-10.6 GHz [1-2], in this technology offer high performance in the indoor and outdoor wireless communication systems. The UWB technology has become one of the most promising technologies for high data rate, high accuracy radar etc. However, there is an issue of a possible electromagnetic interference, the allocated wide band width of the ultra wide band systems [3-6], there are some narrow bands for other communication systems exits, such as WLan operating in 5.15-5.825 GHz, RFID operating in centered in 6.8 GHz, and downlink of X-band satellite communication systems in 7.25-7.75 GHz. In this paper, a compact CPW-fed UWB antenna with band-notched characteristic is presented. The design consists of a G-shape patch. A good impedance matching can be achieved over a very wide frequency band. The geometrical parameters of this printed monopole antenna are optimized by using the software, CST microwave studio. Although these antennas can cover required bands, some are too large in size to be integrated into portable devices, which limit their practical applications. While others have wide bandwidths, which may bring about other electromagnetic interferences.

II. ANTENNA DESIGN AND PARAMETRIC STUDY Fig. 1 shows the final design of the proposed antenna. The antenna is simulated in the CST microwave studio [7-9] with FR4 substrate having a dielectric constant of 4.3 and athickness of 1.6 mm. The final design was optimized taking several aspects into consideration such as bandwidth of the antenna, and level of band rejection. The monopole antenna size of 45 X 36 X 1.6 mm3 on an FR4 substrate with dielectric constant of 4.3.

Fig.1 Geometry of the proposed antenna The location and shape of the slots were determined as shown in Fig.2 In designing the slots, we used to guide

wavelengthffog H

OO (1)

Where oO is the free space wavelength and

21reff HH . (2)

Satyabrata Maiti1, Sangita Das2, Naikatmana Pani3M Tech1, 2, School of Electronics Engineering, KIIT University, Bhubaneswar, INDIA1Satyabratamaiti12@gmail.com, 2sangitadas716@gmail.com, 3naikatman@gmail.com

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5th ICCCNT - 2014 July 11 - 13, 2014, Hefei, China

ADMINTypewritten Text978-1-4799-2695-4/14 $31.00 2014 IEEEDOI- 10.1109/ICCCNT.2014.6963074

Fig.2 slot configuration (units in mm) A circular shape slots on the patch results in notch band at 7.25-7.825 GHz. The effective lengths of the Circular shaped slots are initially decided using (1) and then optimized using aCST microwave studio. In (1) stands for centre frequency 7.5 GHz. The thickness r2 of the slot and location is adjusted to properly tune the notch band centered at 7.5 GHz. parametric study are depicted in fig 3 shown below. It is observed that increases when the length, then shifts towards lower frequency and decrease the length then shifts towards higher frequency.

Fig.3 optimization slot r2

efff

cCL Huu 12_ (3) The gap between the radiation patch and the ground plane is depicted as wp. An optimized value of wp is obtained as 0.5mm.

III. RESULT AND DISCUSSION The proposed antenna is simulated using software CST microwave studio. The current distribution of the antenna at notch frequencies is depicted in fig 4. Due to the storage of large current in the circular slot at the notch frequency 7.5 GHz, no radiation appears at this frequency. However, there is small currently along the circular slot on other frequencies which causes to radiate all other frequencies. In the downlink satellite communication band (7.25-7.825GHz) shows the storage of maximum current in the G shape antenna.

Fig.4 Current distribution at 7.5 GHz The simulated VSWR plot of the designed antenna expects notch band is shown in fig 5 which shows a wide impedance bandwidth from 2.9 GHz to 16 GHz with band notch at 7.5 GHz.

Fig.5 simulated VSWR expects notch band The simulated VSWR plot of the proposed antenna in fig 6

Fig.6 simulated VSWR of the antenna The antenna gain is shown in fig 7.The gain varies from 0.5 dBi to 6.0 dBi. Moreover the distortion less nature of the antenna is confirmed by studying the group delay frequencies.

Fig. 7 Gain of the proposed antenna

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5th ICCCNT - 2014 July 11 - 13, 2014, Hefei, China

Fig. 8 Group delay of the proposed antenna

Simulated radiation patterns in the H-(x-z) and E-(y-z) planes at 3.5 GHz, 5.5 GHz, and 7.5 GHz are shown in fig. 9. The proposed antenna displays a good omnidirectional radiation pattern in the H-plane.

Fig. 9 simulated radiation pattern (a) 3.5 GHz (b) 5.5GHz (c) 7.5 GHz

IV. CONCLUSION In this paper, a compact printed monopole band notch antenna has been presented. The antenna has an operating impedance bandwidth from 2.9 GHz to 16 GHz, with a band-notched from7. 25 GHz to 7.825 GHz band. VSWR is less than 2 (S11 < - 10 dB) over the operating frequency band except band-notch frequency range. The gain variation of this antenna over the ultra-wideband range is 0.5 to 6dB and the gain at notch frequency.

REFERENCES

[1] Anand Kumar, A. Subbarao, M. Ramaraj, and R. Pandeeswari, A Compact Ultra Wideband EBG Antenna with Band Notched Characteristics, PIERS proceedings, Moscow, Russia, August 19-23,2012.

[2] Koohestani, M. Golpour, U-shaped microstrip patch antenna with novel parasitic tuning stubs for ultra wideband applications, IET Trans. Antenna Propag, Vol.4, No.4, No.7, 938-946,2010.

[3] Kumar, A. Yadav, S. Ranga, Y Bhatnagar, A Compact Ultra wide band CPW-fed printed Antenna with SRR for rejecting WLAn Band, Antenna week (IAW), 2011 Indian, Date of Conference 18-22 Dec.2011.

[4] S. Nikolaou, B. Kim, K Kim, J Papapolymerou and M Tentzeris, CPW-fed ultra wideband (UWB) monopolies with band rejection characteristics on an ultra thin organic substrate, IEEE Asia-pacific Microwave Conference, pp 2010-2013,2006.

[5] QU, S, W, J-L. Li, and Q. Xue, A band notch ultra wide band printed monopole antenna, IEEE Antennas and Wireless propagation Letters,Vol.5, 495-498, 2006.

[6] J. Liu, S. Gong, Y.Xu, X. Zhang, C. Feng and N. Qi, Compact Printed ultrawide band monopole antenna with dual band notched Characteristics, Electronics Letters, Vol. 44, no. 12, pp. 710-713, 2008.

[7] Zhang. Z, and Y. H. Lee, A robust cad tool for integrated design of UWB antenna system, Progress In Electromagnetics Research Vol 112,441-457.2011.

[8] Andres-Garcia, B. L. E. Garica- Munoz, D. Segovia-Vargas, I. Camera-Mayorga, and R. Gusten, Ultra wide band antenna Excited by a photo mixer for teraherth band, Progree In Electromagnetics Research, Vol.114, 1-15,2011.

[9] Zhu. F, S-C, S. Gao, A. T. S Ho, T. W.C Brown, J. Li, and J. D. Xu, Low profile directional ultra wideband antenna, Electromagnetics Research, Vol.112, 121-139, 2011.

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