microstrip rectangular patch antenna
TRANSCRIPT
STUDY THE SIZE REDUCTION OF PLANAR ANTENNA BY VARYING
SLIT DIMENSIONS
AIM • To reduce the overall size of Microstrip planar
fed antenna.
• To increase the efficiency of antenna .
• To increase the gain of antenna .
OUTLINES• INTRODUCTION
• DEFINATION OF ANTEENA
• METHODS OF REDUCING PATCH ANTEENA
• GEOMETRY OF MICROSTRIP ANTENNA
• ANTENNA DESIGN
• RESULTS
• CONCLUSION
• REFRENCES
DEFINATION OF ANTENNA
• “ A usually metallic device for radiating or receiving radio waves.”
• “A transitional structure between free space and guiding device.”
ANTEENA RADIATION FORMULA USED
~Zo
I
I
VG
+
-
Antenna
Structure
RF Signal
Source
Transmission
Line
Zo
METHODS OF REDUCING PATCH ANTENNA
1. High Permittivity Substrate
2. Folded Patch
3. Shorting Pin
4. Slot Loaded Ground Plane
5. Slot Loaded Patch
6
BEST SOLUTION-SLOT LOADED PATCH
1. High Permittivity Substrate:
reduced BW, increased dielectric losses, increased cost
2. Folded Patch:
increased volume, complex manufacturing process
3. Shorting Pin:
problems with radiation pattern, feeding and manufacturing
tolerances
4. Slot Loaded Ground Plane:
problems with back radiation, less transmission power
5. Slot Loaded Patch:
can produce wide range of designs:
Reduced Size Single Frequency, Dual Frequency, Wideband
1. High Permittivity Substrate:
reduced BW, increased dielectric losses, increased cost
2. Folded Patch:
increased volume, complex manufacturing process
3. Shorting Pin:
problems with radiation pattern, feeding and manufacturing
tolerances
4. Slot Loaded Ground Plane:
problems with back radiation, less transmission power
5. Slot Loaded Patch:
can produce wide range of designs:
Reduced Size Single Frequency, Dual Frequency, Wideband
GEOMETRY OF ANTENNA
Top view
Side view
PERFORMANCE
CHARACTERISTICS:
1. Return loss
2. Band width
3. Resonant frequency
4. Antenna efficiency
5. Radiation efficiency
6. Gain
ANTENNA DESIGN
REFERENCE ANTENNA
L=29.4mm, W=30 mm, єr=2.33, h=1.57 mm
Performance characteristics
• Return loss of reference antenna : -12.89
•Resonant frequency : 3.202
OURPROPOSEDDESIGNS
PROPOSED DESIGN: 1
Antenna with two equal slits on width side
SIMULATION AND PRACTICAL RESULTS OF DESIGN 1
Performance Characteristics
Due to increase in slit length following changes occur :
• Resonant frequency increases.
•Bandwidth also increases.
•Antenna efficiency & radiation efficiency increases.
•Gain increases .
PROPOSED DESIGN: 2
Antenna with three equal slits on width side and length side
SIMULATION AND PRACTICAL RESULTS OF DESIGN 2
Performance CharacteristicsDue to increase in width following changes occurs:
•Resonant frequency decreases.
• Return loss increases.
•Bandwidth decreases
•Antenna efficiency increases.
•Gain increases.
TOTAL DESIGN GAIN (dbi)
PROPOSED DESIGN :3
Antenna with four equal slits on length side
SIMULATION AND PRACTICAL RESULTS OF DESIGN 3
Performance characteristicsDue to increase in length of slits following changes occur:
•Resonant frequency decreases.
•Bandwidth decreases.
•Antenna efficiency abruptly increases when length is 3mm & width is 2 mm.
TOTAL GAIN (dbi)
RESULTS
According to given equation frequency is inverselyproportional to length.
• In our first proposed antenna , frequency increases and todecrease it we have to increase the length of antenna .
• In our second proposed antenna, frequency decreases and wehave decrease the size of antenna to increase the frequency.
• In our third proposed antenna we observed that there istremendous decrease in resonant frequency where as there issteep increase in antenna efficiency .So to increase frequencywe have to reduce the size of antenna .
CONCLUSION
Focus on operating frequency to reduce the
size of patch is investigated . From the above
findings it is concluded that around 7-8 %
size reduction is possible, and no impedance
matching network is required for the size
reduction of proposed antenna .
REFERENCE
• [1] Dey, S., and Mittra, R.: ‘Compact microstrip patchantenna’, Microw. Opt. Technol. Lett., 1996, 9, pp. 433–434
• [2] C. A. Balanis, “Antenna Theory Analysis and Design”,John Willy & Sons, 2nd Edition, C hipster 14,pp.730734, 1997.
• [3]Wong, K.L., and Wu, J.Y.: ‘Single-feed small circularpolarised square microstrip antenna’, Electron. Lett.,1997, 33, (22), pp. 1833–1834 2
• [4] Lu, J.H., and Wong, K.L.: ‘Slot-loaded, meanderedrectangular microstrip antenna with compact dual
•[5]George, J., Deepukumar, M., Aadandan, C.K.,Mohanan, P., and Nair, K.G.: ‘New compact microstripantenna’, Electron. Lett., 1996, 32, pp.•[6] W u, C.K., Wong, K.L., and Chen, W.S.: ‘Slot-coupled meandered microstrip antenna’, Electron. Lett.,1998, 34, pp. 1047–1048 6 Ansoft Ensemble1 V.7method of moments 2.5D EM field solver• [7] M . Elsdon, A. Sambell and Y. Qin ,’ Reduced sizedirect fed planer antenna’, 2005•[8] IE3D Software release 12.21 [Zeland softwareInc.,Fremont, California, USA].
PRESENTED BY:S.K KUNDU SACHIN SHARMA SUMISHA JINDAL RASHMI MALLIK
Thank you for your attention