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  1. 1. Design and analysis of various types of Micro Strip Antennas Under esteemed guidence of Mr.J.Lakshmi Narayana M.Tech,Ph.DD.L.Pavan kumarJ.AnushaB.ManikantaK.Vidya raniM.Sampath kumar
  2. 2. Introduction to Micro Strip Antennas In genaral Micro strip antennas are also known as “ PRINTED ANTENNAS ”. These are mostly used at microwave frequencies Because the size of the antenna is directly tied the wavelength at the resonant frequency. Micro strip patch antenna or patch antenna is a narrowband wide-beam antenna. The patch usually fed along the centerline to symmetry and thus minimize exitation of undesirable modes.
  3. 3.  Micro strip antennas are easy to fabricate and comfortable on curved surface . The directivity is fairly insensitive to the substrate thickness. Micro strip patch antennas patches are in variety of shapes , such as rectangular , square , triangular and circulator
  4. 4. Aim: The design and analysis of various micro strip patch antennas such as rectangular ,square ,circular and arrays are proposed in this project . An artificial neural network model are to be developed for proposed micro strip antennas . A comparative study on the performance of various micro strip antennas i.e between square , circular,rectangular antennas are observed.
  5. 5. Patch Shapes Are:
  6. 6. Other Shapes Are :
  7. 7. Substrates are: The most commonly used substrates are, 1) Honey comb(dielectric constant=1.07) 2)Duroid(dielectric constant=2.32) 3)Quartz(dielectric constant=3.8) 4)Alumina(dielectric constant=10) A thicker substrate will increase the radiation power , reduce conductor loss and improve Band width.
  8. 8. Feeding Techniques: Coaxial feed Microstrip feed Proximity coupled microstrip feed Aperture coupled microstrip feed Coplanar wave guide
  9. 9. Among all the feeds most prefarable oneis coaxial feed.Because impedence matching is achivedthrough this feed .This feed is using huygen’s principlemodeled by cylindrical band of electriccurrent.
  10. 10. Comparision of various types of flatprofile printed antennas:Charaterstics Microstrip patch Microstrip slot Printed diploe antenna antenna antennaProfile Thin Thin ThinFabrication Very easy Easy EasyPolarization Both linear& Both linear& Linear circular circularDual freq Possible Possible PossibleoperationShape Any shape Rec &circle Rec &tiangularSpurious radiation Exists Exists exists
  11. 11. Softwares used: For design and simulation we are using ‘MAT LAB’ software For analysis we are using the ‘SONET’ and ‘AN- SOFTWARE. For artificial neural networks model we are using the different simulation softwares.
  12. 12. Advantages: Easy to fabricate on curved surfaces Easily integrated Dual frequency and dual polarization can be easily made. Linear and circular polarization is possible Low cost , Less size Can be integrated in microwave circuits
  13. 13. Disadvantages: Narrow bandwidth associated with Tollerence problem Lower gain(nearly 6db) Large ohmic losses in feed structure of arrays Exitation of surface waves Most microstrip antetnnas radiate into half-space
  14. 14. Remedies: Low power and low gain can overcome by arrays configuration. Surface wave associated limitations such as poor efficiency,increased mutual coupling,reduced gain and radiation pattern can overcome. The band width can increase upto 60% by using some special techniques.
  15. 15. Applications: Used in mobile satellite communication system. Direct broad cast telivision(DBS). Wire less LAN’S. Feed elements in coaxial system GPS system. Missiles and telementry
  16. 16. Microstrip antenna used in robot:
  17. 17. References: Microstrip antenna design hand book Author: BAHL and BHARTIA Analysis and design of microstrip antennas Author :Alka Verma Microwave journal Author:Pasquale Dottorato