Volume-4, Issue-4, August-2014, ISSN No.: 2250-0758

International Journal of Engineering and Management Research

Available at: www.ijemr.net

Page Number: 218-221

Diamond Shape Microstrip Antenna using “Slots” at 2.5 Ghz, Antenna Efficient to Achive High Directive Gain

Rupal Shivhare

1, Rachit Jain

2

1M.E, ITM College Gwalior Madhya Pradesh, INDIA

2Assistant Professor, ITM College Gwalior Madhya Pradesh, INDIA

ABSTRACT

The Design of a Diamond shape slotted microstrip

antenna with circular polarization radiation. The antenna have

a 1.6 mm glass Epoxy substrate and single rectangular microstrip radiating patch, Where the radiating efficiency is

high and also high Gain. The results show that the proposed

antenna is able to achieve VSWR less than 2, antenna efficiency and radiation Efficiency above the 90% the

percentage bandwidth is 25%. Keywords-- Diamond shape, Mmicrostrip, Slotted,

I. INTRODUCTION

Antennas are a very important component of

communication systems. By definition, an antenna is a device used to transform an RF signal, traveling on a conductor, in to an electromagnetic wave in free space the broadband circularly polarized microstrip antennas

play a vital role in wireless communication due to its low-profile, small-size and light weight. As well know, a circularly polarized wave can be obtained when spatially orthogonal modes are excited with equal amplitude. Conventional designs of microstrip antennas for circular

polarization are usually achieved by truncating patch corners [1], cutting rectangular slots in Diamond shape rectangular patch.

Fig. 1: Geometry of Proposed antenna on IE3D

II. SUBSTRATE MATERIAL USES

The first design step is to choose a suitable

dielectric substrate of appropriate thickness h and loss tangent. A thicker substrate, besides being mechanical strong, will increases the radiate power, reduces conductor loss, and improved impedance bandwidth however, it will also increase the weight, dielectric loss, surface wave loss, and extraneous radiations from the probe field. Substrate dielectric constant εr plays a role similar to that of the

substrate thickness.

III. ANTENNA DESIGN

Fig. 1and 2 shows the geometry of the proposed

Diamond Shape microstrip antenna, The radiating rectangular patch, printed on a substrate of thickness h and relative permittivity εr, has the dielectric material thickness

is 1.6mm the length of both side, Lp =27mm,Wp=37mm

and has a finite ground of Lg = 36.6mm ,Wg = 46.6 mm is excited by the two feed disks, which are oriented in

orthogonal directions and have the same distance of feed

point is X= 17 mm. and Y=6.6mm

218

IV. SIMULATED RESULTS

To validate whether the design technique is

applicable, the antenna has been simulated with IE3D Fig.3,

Fig.4 and Fig. 5 shows the Return loss verses Frequency,

VSWR versus Frequency and smith chart of the proposed

antenna .From the simulation results, Fig 6, 7 is 3D radiation

pattern,Fig 8,9 shows 2D pattern of radiation, Fig 10,11

indicate gain and Directivity of antenna and Fig 12 and 13

shows the axial ratio and efficiency of antenna . We observe

that the proposed antenna is able to achieve the bandwidth

Fig. 2: 3D view of Geometry

Fig. 3: Return loss vs frequency.

is 25%, and the VSWR less than 2. The feed point connected with the coaxial connector, have good equal amplitude and 90° phase shift, CP radiation can be achieved [5]. Furthermore, by using the thick air substrate, much wider CP bandwidth can thus be obtained. The impedance matching of the antenna can be achieved by fine adjusting the feed position, radius of feed disks. The distance between the radiating patch and the ground plane is1.6mm.

Fig. 4 : VSWR versus frequency

Fig. 5: Smith chart of S parameter

Fig.6: 3D Radiation pattern view

219

Fig.7: Side view of 3D Radiation pattern view Fig.10: Gain Vs frequency

Fig.11: Directivity Vs frequency

Fig.8: 2D Radiation pattern view of gain

Fig.12: Axial ratio Vs frequency Fig.9: 2D Radiation pattern view of Directivity

220

Fig.13: Efficiency Vs frequency

Table.1 content the antenna parameter

Fo ( operating frequency) 2.5 GHz

h (height of dielectric) 1.6 mm

εr (dielectric constant) 4.4 mm

Lp (length of patch) 27 mm

Wp (width of patch) 37 mm

Lg (length of patch) 36.6 mm

Wg (width of patch) 46.6 mm

Fr (resonant frequency) 2.5 GHz

Table.1

Table.2 content IE3D output

Frequency Resonant IE3D output

in GHz. Frequency (return loss )

GHz

2.5 2.5 -21.25db

Table.2

In this paper, a new design of Diamond shape

microstrip antenna with 2.5 GHz. The antenna have an output by using IE3D antenna resonant at the frequency of 2.5and have greater return loss of -21.25 db. A thick air substrate is used in the present proposed design, and impedance matching is obtained through the rectangular radiating patch. The results show that the proposed antenna is able to achieve VSWR less than 2 and the return loss is less then -10.db.

V. CONCLUSIONS

Characteristics of rectangular Diamond Shape

microstrip antenna have been analysis, The proposed antenna is achieved gain of 4 db, efficiency is more than 90% and band limit is lies between the WLAN region, microstrip antenna is able to achieve VSWR less than 2 and the return loss is less the -10db and in this paper the bandwidth is 25% .

REFERENCES

[1] Z. L. Dafalla, W. T. Y. Kuan, A. M. Abdel Rahman, and S. C. Shudakar, “Design of a Rectangular Microstrip Patch Antenna at 1 GHz”, Rf And Microwave Conference, October 5 - 6- 2004, Subang, Selangor, Malaysia [2] C.Y. Chiu, C.H. Chan and K.M. Luke, “Study of slotted microstrip patch antennas with folded patch feed ”, Microwave Antennas propagation., vol. 152, no. 5, October 2005 [3] C -Y Huang, J-Y Wu and K-L Wong , “Cross-slot-coupled microstrip antenna and dielectric resonator antenna for circular polarization”,. IEEE Trans on Antennas and Propagate, 1999, PP-47 [4] S Matsuzawa and K Ito. Circularly polarized printed antenna fed by coplanar waveguide. Electronic. Letter, Vol.32 No.22, 1996 [5] S. D. Targonski and D. M. Pozar. Design of wide- band circularly polarized aperture coupled microstrip antenna. IEEE Trans. on Antennas and Propagate, vol. 41, pp. 214-220, 1993.

221 Copyright © 2011-14. Vandana Publications. All Rights Reserved.