PAPER PRESENTATION ON

“DESIGN OF FREQUENCY RECONFIGURABLE MICROSTRIP PATCH ANTENNA”

PRESENTED BY- RAJASTHAN TECHNICAL UNIVERSITY,KOTA

GHANSHYAM SINGH RAJASTHAN (INDIA)

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PRESENTATION PLAN

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1. Introduction1. Introduction

2. Need of reconfiguration technique2. Need of reconfiguration technique

3. Description of reconfigurable Antennas3. Description of reconfigurable Antennas

5. Simulation and results5. Simulation and results

6. Conclusion6. Conclusion

4. Basic design method 4. Basic design method

INTRODUCTION

About Antenna:-

Wireless communication systems have developed rapidly in

recent years. an antenna as a front component is required

to have a wide band, good radiation performances and

sometimes switchable ability.

Importance of Switchable ability:-

To obtain the switchable ability of the antenna, the concept

of a reconfigurable antenna was proposed . The reconfigurable

characteristics of antennas are very valuable for many

modern wireless communication and radar system applications3

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The patch antennas can reconfigure by cutting rectangular or half-circular slots Different types of slots in the patch element are used and their dimensions have been varied in order to observe the relationship between maximum attainable linear phase range and the loss performance

Patch antenna:-

Microstrip Line Feed

Coaxial Feed

Aperture Coupled Feed

Proximity Coupled Feed

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FEED TECHNIQUES OF PATCH ANTENNA

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AntennaDesign

OptimizationSimulation

Reconfigurable antenna implementation

A frequency reconfigurable antenna

A reconfigurable radiation pattern

antenna

A reconfigurable polarization antenna

Combinations of the above stated

categories

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CATEGORIES OF RECONFIGURABLE ANTENNAS

Group 1: Antennas using switches

Group 2: Antennas using capacitors or

varactors

Group 3: Antennas using physical

angular alteration

Group 4:Antennas using different biasing

networks

Group 5: Antenna arrays

Group 6: Antennas using reconfigurable

feeding networks

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RECONFIGURABLE ANTENNAS CLASSIFICATION

Cognitive radio

Plug and play reconfigurable satellites

Multiple Input Multiple Output (MIMO)

communication systems

Cellular and personal communication

systems

Military applications

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RECONFIGURABLE ANTENNAS APPLICATIONS

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Basic design method

A new reconfiguration design technique is proposed by using slot configuration in the microstrip rectangular and circular patch antennas with two diodes connected inside the slot with on and off state working strategy. The frequency reconfiguration can be obtained by switching between the diodes.

The frequency can be varied in three different steps.

Both two diodes(D1 OFF , D2 OFF) are in off state

One diode D1 is in ON and another diode D2 is in OFF state

Both two diodes(D1 ON , D2 ON) are in ON state

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L D1 D2

W

D1=OFF & D2= OFF

l

w

d

t

s

CASE-1 Diode D1 OFF & D2 OFF

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13

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L D1 D2

W

D1=ON & D2= OFF

l

w

d

t

s

CASE –II Diode D1-ON & D2- OFF

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16

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L D1 D2

W

D1=ON & D2= ON

l

w

d

t

s

CASE-III Doide D1- ON & D2-ON

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Light weight and low volume.

Low profile planar configuration which can be

easily made

conformal to host surface.

Low fabrication cost, hence can be

manufactured in large

quantities.

Supports both, linear as well as circular

polarization.

Can be easily integrated with microwave

integrated circuits (MICs).

Capable of dual and triple frequency operations.

Mechanically robust when mounted on rigid

surfaces.

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ADVANTAGES OF PATCH ANTENNA

Narrow bandwidth

Low efficiency

Low Gain

Extraneous radiation from feeds and junctions

Poor end fire radiator except tapered slot

antennas

Low power handling capacity.

Surface wave excitation

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DISADVANTAGES OF PATCH ANTENNA

In this seminar the first aspect is the design of

recon- figurable antennas. These antennas are

reviewed, classified and grouped. They are

categorized into different groups based on their

reconfiguration techniques and they are classified

based on their reconfigurability properties.

Reconfigurable antenna designs, their

reconfiguration techniques and their applications

are reviewed. And a implementation is presented

and results are compared.22

CONCLUSIONS

THANKS

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