ETMSA WITH AND WITHOUT SHORTING
PINS
PRESENTED BY:
Vinutha P22EC001
Pawan Maurya P22EC010
UNDER THE GUIDANCE OF RAMYA RADHAKRISHNAN MAM
AIM OF THE PROJECT
►
ETMSA WITHOUT SHORTING PINS
►
SHORTED 60 SECTOR
►
COMPLIMENT OF SHORTED 60 SECTOR
INTRODUCTION
►
Microstrip antenna is printed antenna. Most popular MSA is Patch
antenna.
►
If the shape of the patch is equilateral triangle, then it is known as
EQUILATERAL TRIANGULAR PATCH ANTENNA.(ETMSA).
► Patch Antenna Contains
Ground(Metal),Substrate(dielectric),Patch(metal).
INTRODUCTION
❑
Ground plane is used to reflect the radio waves from the other
antenna elements. This is not etched out.
❑
Substrate between patch and ground plays an important role in the
design since it decides the bandwidth as well as the size of
microstrip antenna.
❑
If dielectric constant increases, it decreases Bandwidth, increases
Q factor, decreases impedance bandwidth.
SUBSTRATES
❑ Arlon/Duroid- Used(epsilon=2.5)
▪ Loss tangent is small
▪ Cost is very high.
❑ Alumina
❑ Glass epoxy
❑ Foam
ETMSA
❑
Triangular microstrip antenna is used commonly in wireless
communication.
❑
It has omnidirectional radiation pattern.
DESIGN
❑
Resonant frequency of the triangular patch antenna is
❑
Where Se is Electrical length of the radiating side and Sp is the
physical length of radiating side.
❑
Se>Sp due to the fringing fields.
EXPLANATION
❖ Feed is given in central axis to make it
symmetrical.
❖ This is not completely symmetrical, Hence
cross polar component is more.
❖ 0 field point is at centroid.
FIELD VARIATION
Shorting Pins
❑
Shorting pins are used to achieve various performance characteristics of microstrip patch
Antennas.
❑
Appropriately placing shorting pins can be used to tune the resonant frequencies of the
triangular patch antenna.
❑
Using shorting pin reduces patch size and this technique is used to obtain larger
bandwidth.
ETMSA WITHOUT SHORTING PIN
GROUND
SUBSTRATE
PATCH
ETMSA WITHOUT SHORTING PIN
ETMSA WITHOUT SHORTING PIN
ETMSA WITHOUT SHORTING PIN
S PARAMETER
ETMSA WITHOUT SHORTING PIN
SMITH CHART
ETMSA WITHOUT SHORTING PIN
VSWR v/s FREQUENCY
ETMSA WITHOUT SHORTING PIN
POLAR PLOT
ETMSA WITHOUT SHORTING PIN
RADIATION PATTERN
ETMSA WITH SHORTED 60 SECTOR
ETMSA WITH SHORTED 60 SECTOR
ETMSA WITH SHORTED 60 SECTOR
S PARAMETER
ETMSA WITH SHORTED 60 SECTOR
SMITH CHART
ETMSA WITH SHORTED 60 SECTOR
VSWR V/S FREQUENCY
ETMSA WITH SHORTED 60 SECTOR
RADIATION PATTERN
ETMSA WITH SHORTED 60 SECTOR
POLAR PLOT
ETMSA WITH SHORTED COMPLIMENTED
60 SECTOR
ETMSA WITH SHORTED COMPLIMENTED
60 SECTOR
ETMSA WITH SHORTED COMPLIMENTED 60
SECTOR
S PARAMETER
ETMSA WITH SHORTED COMPLIMENTED 60
SECTOR
SMITH CHART
ETMSA WITH SHORTED COMPLIMENTED 60
SECTOR
VSWR v/s FREQUENCY
ETMSA WITH SHORTED COMPLIMENTED
60 SECTOR
RADIATION PATTERN
ETMSA WITH SHORTED COMPLIMENTED
60 SECTOR
POLAR PLOT
OBSERVATION TABLE
Patch type
Resonant Freq.
fo (GHz)
S11(dB)
VSWR
B.W (MHz)
Impedance
Matching(Oh
m)
Area(cm2)
ETMSA without
shorting pin
TMSA with
shorted 60o
Sector-
2.99
-27.64
1.102
42
50.57
6.92
3.0157
-26.71
1.148
35.8
50.76
2.78
TMSA with
Compliment
shorted 60o
Sector-
3.077
-25.02
1.152
33.7
50.8
4.14