2. CONTENTS
• Introduction
• Fundamental parameters of antennas
• Rectangular microstrip patch antenna
• HFSS
• Design specification of rectangular patch antenna
• Analysis of patch antenna
• Results of patch antenna
• Advantage & disadvantage
• Application
• Conclusion
• References
3. Introduction
Antenna is defined as “a usually metallic device (as a
rod or wire) for radiating or receiving radio waves.” But as
for IEEE standard definitions of terms for antenna or aerial
as “a mean for radiating or receiving radio waves.”
Regardless of antenna
type, all involve the same
basic principle that radiation
is produced by accelerated (or
de-accelerated) charges.
6. . Field regions
> reactive near field region
> radiating near field region
> far field region
. Radiation intensity
. Directivity
. Gain
. Bandwidth
. S-parameter
. Z-parameter
. VSWR
7. Rectangular microstrip patch
antenna
>In general 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 to the half 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 excitation of
undesirable modes.
8. 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
10. HFSS
. HFSS stands for high
frequency structure simulator
. ANSYS HFSS software is
the industry standard for
simulating 3-D full wave
electromagnetic fields
Modes of operation
. HFSS 3D model
. Electrical CAD
interface
. HFSS 3D layout
11. ANSOFT HFSS
• Solution Type
Driven Model
Driven Terminal
Eignemode
• Parametric model
Generation
3D modelling
Overview of Draw (Snap,moving)
Material
View of Model
Boundary Condition
Assign Port
• Analysis Setup
Adapt Frequency
Convergence criteria
Initial Mesh options
Adaptive options
Low order Basis Function
13. Design specification of rectangular
patch antenna
. 3D model
> Ground
> substrate
> microstrip line(feed)
> patch
. Assigning boundary
. Assigning excitation
14. Analysis of patch antenna
. Analysis setup
> solution freq
> max number of passes
> max Delta S per pass
. Freq sweep
> starting freq
> attenuating freq
> number of counting
. Analyze
15. Results of patch antenna
. Solution data
> matrix data
> convergence
17. . Far field reports
> radiation pattern in 2D
> 3D polar plot
> rectangular plot
18. Advantage & disadvantage
.Advantage
Easy to fabricate on curved surfaces
Easily integrated on MIC circuits
Dual frequency and dual polarization can be easily made.
Low cost , Less size in volume
Mechanically robust on rigid surface
Compatible with modular design
.Disadvantage
Narrow bandwidth
Lower efficiency & gain(nearly 6db)
Large ohmic losses in feed structure of arrays
Excitation of surface waves
Most microstrip antennas radiate into half-space
Low power handling capability
19. Application :-
Used in mobile satellite communication system.
Used in aircraft , spacecraft & missiles
Direct broad cast television(DBS).
GPS system.
Telemetry & telemedicine
Radar application
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.
20. Conclusion
Return loss, gain and efficiency are acceptable
Bandwidth enhancement of 20dB is possible
Our future work will be carried out using different feeding
techniques with different software………
Simple, small size and high efficiency antenna can be
designed
21. References
C. A. Balanis, “Antenna Theory, Analysis and Design,” John Wiley & Sons, New
York,1997.
B.-K. Ang and B.-K. Chung “A wideband e-shaped microstrip patch antenna
for 5–6ghz wireless communications”. Progress in Electromagnetics
Research, PIER 75, 397–407, 2007
Mr.Anil K.K. leacturer of ECE Department,cochin university college of
engineering, CUSAT
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