Design of E- Shape Patch Antenna Using IE3D Simulator

Presented By Name Roll No.

Sudhaang Mog 29 Punit Patel 35 Bablu Singh 57 Sagar Singh 59

Under the Guidance of : Prof. P. G. Pawar

An MSA in its simplest form consists of a radiating patch on one side of a dielectric substrate and a ground plane on the other side.

Introduction

The patch is a conductor which is etched on dielectric substrate.

Radiation pattern of antenna depends on size and shape of patch.

Patches are in variety of shapes such as

Patch

The substrates used in microstrip antenna is primarily provide mechanical strength to antenna.

A dielectric substrate is defined by its two prime parameters i.e. permittivity and loss tangent.

The cost of antenna design is also affected by dielectric material.

Ground plane It is the large sheet of metal below the substrate. Substrate is used to seprate ground plane to patch.

Dielectric substrate

Feeding Techniques

A conducting strip is connected to the edge of the patch. The feed can be etched on the substrate.

AdvantageIt is simple and easy to fabricate.It can be eached on same substrate.

DisadvantageIt gives undesired radiation.

a) Microstrip line feed

The inner conductor of the coaxial connector extends through the dielectric and is soldered to the radiating patch, while the outer conductor is connected to the ground plane.

AdvantagesFeed can be placed at any desired location.Low spurious radiation.

DisadvantagesNarrow bandwidth and difficult to model.

b) Coaxial feed

Coupling between the patch and feed line is made through a slot or an aperture in the ground plane.

AdvantageEliminates spurious radition.

DisadvantageFabrication process is difficult.

c) Aperture coupled feed

Two dielectric substrates are used such that the feed line is between the two substrates and the radiating patch is on top of the upper substrate.

d) Proximity coupled feed

Low weight, low profile planar configuration and low volume.

Low cost of fabrication and ease of manufacturing.

They allow for dual- and triple-frequency operations.

They can be made compact for use in personal mobile communication.

Advantages

Narrow BW;

Lower gain;

Low power-handling capability.

Disadvantages

Used in mobile satellite communication system. Direct broad cast television(DBS). Wire less LAN’s. Feed elements in coaxial system GPS system. Missiles and telementry

Applications

The analysis methods for MSAs can be broadly divided into two groups.

The methods are based on equivalent magnetic current distribution around the patch edges There are three popular analytical techniques:

The transmission line model; The cavity model; The MNM.

Method of analysis

In the second group, the methods are based on the electric current distribution on the patch conductor and the ground plane

Some of the numerical methods for analyzing MSAs are listed as

follows:

The method of moments (MoM); The finite-element method (FEM); The spectral domain technique (SDT); The finite-difference time domain (FDTD) method.

Method of analysis

E- Shape Patch Antenna

1) The Patch width

Substituting,C= 3*10^8;F=2.5 GHz;Dielectric constant=4.3;We get, w= 37mm

Designing Steps

Substituting,H=1.5mm;W=37mm;We get, = 4

2) Effective dielectric constant

Effective length,

Effective length = 0.03m

Extended length,

Extended length= 7.0812 * 10^-4m

Length of the patch

Length of patch = 29mm

3) Length of the patch

proposed E–Shape rectangular microstrip patch antenna dimension length 29 mm, width 37 mm. cut into slot w1 is 6 mm &W2 is 18 mm. This antenna 50 Ω microstrip feed line are used.

The proposed antenna has: - Proposed patch length = 29 mm Proposed patch width = 37 mm Cut width W1= 6 mm Cut width W2= 18 mm

Designing E-patch

In this project we design an E-shape rectangular microstrip patch antenna. It has dual frequency band with center frequency 2.5 GHz, thickness 1.5mm, dielectric constant 4.3, loss tangent 0.019 are simulated at 1-9 GHz frequency. The best result of L and C band, return loss is three notch -27.69,-13.71&-20.35dB, VSWR value is 1.086, 1.52 & 1.213 in 2, 6 & 8GHz frequency. Bandwidth up to 33%, 31% and 54%. Antenna efficiency is 88%. This antenna is very effective in communication.

Abstract

Parameters

IE3D is an integral equation and method of moment based EM simulator.

IE3D mainly focuses on general planar and 3D metallic structures in layered dielectric environments. It is very efficient, accurate and flexible for such structures.

IE3D can also model 3D dielectric structures such as patch antennas with finite substrates and dielectric resonator antennas.

Introduction to IE3D

Microwave circuits and MICs Microwave, RF and wireless antennas.

RFID tag antennas. Many other low to high frequency structures.

Applications of IE3D

For proposed design the value of VSWR is effective between 1GHz to 9 GHz, for this value return loss is minimum at 2 GHz return loss is -27.69 dB and VSWR is 1.086, At 6 GHz VSWR is 1.52, 8 GHz VSWR 1.213.

Expected results

The return loss curve Fig.2 show the best result in Dual band frequency is return loss is – 27.69, -13.71, -20.35 dB. The best result is 2 GHz frequency is – 27.69 dB

Expected results

By studying Microstrip patch antenna we have learned about the Radiation Pattern, Bandwidth, VSWR and loss characteristics of the E – shape antenna.

Conclusion

Thank You!