Enhancement of Quality of Radiation Pattern with Modification Of Metamaterial Superstrate Of Microstrip Antenna

Enhancement of Quality of Radiation Pattern with Modification Of Metamaterial Superstrate Of Microstrip Antenna

Manish Sharma Assistant Prof Anshul Shrivastava

Department of Electronics Departmen t of Electronics

M P C T,Gwalior(M.P) M P C T,Gwalior

Abstract

High directive planner antenna has been already analyzed in the context of layer of metamaterial structures. This results of high negative permittivity and permeability. In this project a modification in the metamaterial structure is being done by a machine square cut of 4×4mm at centre of weight machine square cut shape patch antenna. The simulation has been done by IE3D software. In this due to the square cut the negative permittivity and negative permeability increases which enhances radiation of the microstrip antenna.

1. INTRODUCTION

   Compact directive antennas with a single feeding point are highly Attractive demand[4,6].Conventional patch antenna has simple feeding mechanism, whereas its radiated pattern is affected by the surface wave and has low gain and bandwidth[5]. On the way modification of meta material superstrate of microstrip antenna can offer the directive feature. The high directive and wideband antenna with more compact structure and simple feeding is of great

2. DESIGN OF MICROSTRIP ANTENNA

   1. Designing of Rectangular Micro Strip Patch Antenna

      Operating frequency (fr) = 2.82 GHz, Dielectric constant of the substrate r=4.4,

      Height of the substrate (h) =1.6mm, Loss

      tangent = 0.01, Feed type Transmission line

   2. Calculation of Width (W)

      W V0 2

      2 fr r 1

      Vo = free space velocity of light

      r = Dielectric constant of substrate.

   3. Calculation of Effective Dielectric Constant

      1

      interest in recent years. New artificial materials, such as metamaterial, are introduced to design antenna for enhancing the performance and reducing the profile

      reff

      r 1 r 1 1

      2 2

      12 h 2

      W

      [4]. The magnetic field and the wave vector form a left handed system[1]. The improvement of the

   4. Calculation of Effective Length (Leff)

      c

      performances of antennas in the microwave range of frequencies [2, 3]. It is noted in that some principal

      Le ff

      = 2 f0

      reff

      properties of waves propagating in materials with negative permittivity and negative permeability are considered and high directivity can be obtained from

   5. Calculation of Length Extension (L)

      conventional antenna using metamaterials [9]. next design we centrally cut 4×4mm by using these cut return loss is more and more negative . The simulate.ion results show that the gain and bandwidth of the antenna with cut in the next design. It is improved and the antenna directivity is enhanced

      L 0.412h

      reff

      reff

      0.3 W h

      0.258 W

      h

      0.264

      0.8

      Obviously. 2.6 Calculation of Actual Length

      Le ff = L + 2 L

      1. Calculation of Half Power Beam Width (HPBW)

         The HPBW of Electric and magnetic field

      2. Calculation of Directivity

         D= (41253/EH)

      3. Calculation of Gain

      G= (32400/EH)

3. Simulation Results

   Fig. 1: Weight machine Shape Patch Antenna Specification

   1. Lengtp = 24 mm, Widtp = 20 mm

   2. Lengtp = 24 mm, Widtp = 22 mm

   3. Dielectric constant = 4.4

   4. Substrate height = 1.6 mm

   5. Loss tangent = 0.01

   6. Width of the Strip Lines =2 mm & 1 mm.

   7. Operating Frequency = 2.827 GHz

   8. Dielectric material is Glass Epoxy

   Fig. 2: Return Loss Graph v/s Frequency Fig. 3: Efficiency Vs Frequency

   Fig. 4: Weight machine square cut Shape Patch Antenna

   Specification:

   1. Lengtp = 24 mm, Widtp = 20 mm

   2. Lengtp = 24 mm, Widtp = 22 mm

   3. Dielectric constant = 4.4

   4. Substrate height = 1.6 mm

   5. Loss tangent = 0.01

   6. Width of the Strip Lines =2 mm & 1 mm.

   7. Operating Frequency = 2.896 GHz

   8. Dielectric material is Glass Epoxy 9). Cut at the centre 4×4mm

   Fig. 5: Return Loss Graph v/s Frequency

   Fig. 6: Efficiency Vs Frequency

4. SIMULATION RESULTS AND DISCUSSION

After designing and simulation the antenna, ensuring that it operates at the desired frequency and recording its return loss. The new square cut shaped structure is place on the without cut patch antenna at a height of 1.6mm from the ground plane. Patch antenna to observe the gain, directivity of the antenna. The return loss was also obtained at the same time and been analyzed. The simulation results of weight machine shape microstrip patch antenna with square cut shaped structure are show in fig.2 & fig.5; simulation exhibits weight machine shape antenna alone shows the return loss of -11.65 dB while when it is designed with structure at 1.6mm it shows return loss of -18.45dB. Which shows significant reduction in return loss using such structure, that ultimately improves the quality of communication. Other supporting plots for various parameters like efficiency show in fig.3&6. Here that shows the quality of simulated antenna using square cut is improving without making variations in other parameters.

CONCLUSION

In conclusion metamaterial structures help to improve some features of microstrip antenna. The near zero refraction index of these structures concentrate radiation energy of patch of antenna,consequently, they increase Gain of antenna and beam shaping of antenna radiation pattern. Also they help to improve bandwidth or antenna when two layers metamaterial superstrate are used.

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