This document discusses the design and analysis of various types of microstrip antennas. Microstrip antennas, also known as printed antennas, are easy to fabricate and comfortable on curved surfaces. They are mostly used at microwave frequencies because their size depends on the wavelength of the resonant frequency. Various patch shapes are analyzed including rectangular, square, circular, and arrays. Feeding techniques like coaxial feed, microstrip feed, and proximity coupled microstrip feed are discussed. The document compares characteristics of microstrip patch antennas, microstrip slot antennas, and printed dipole antennas. It outlines the software used and discusses advantages like low cost and integration capabilities as well as disadvantages like narrow bandwidth.

1. Design and analysis of various types of
Micro Strip Antennas
Under esteemed guidence
of
Mr.J.Lakshmi Narayana M.Tech,Ph.D
D.L.Pavan kumar
J.Anusha
B.Manikanta
K.Vidya rani
M.Sampath kumar

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.  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. 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. Patch Shapes Are:

6. Other Shapes Are :

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. Feeding Techniques:
 Coaxial feed
 Microstrip feed
 Proximity coupled microstrip feed
 Aperture coupled microstrip feed
 Coplanar wave guide

9. Among all the feeds most prefarable one
is coaxial feed.
Because impedence matching is achived
through this feed .
This feed is using huygen’s principle
modeled by cylindrical band of electric
current.

10. Comparision of various types of flat
profile printed antennas:
Charaterstics Microstrip patch Microstrip slot Printed diploe
antenna antenna antenna
Profile Thin Thin Thin
Fabrication Very easy Easy Easy
Polarization Both linear& Both linear& Linear
circular circular
Dual freq Possible Possible Possible
operation
Shape Any shape Rec &circle Rec &tiangular
Spurious radiation Exists Exists exists

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. 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. 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. 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. 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. Microstrip antenna used in robot:

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