1. Jessore University of Science and Technology,
“DESIGN & SIMULATION OF A CIRCULAR MICROSTRIP PATCH ANTENNA OPERATES IN DUAL BAND FOR WIRELESS COMMUNICATIONS”
Presented by
Sheikh Dobir Hossain
Department of Physics
Jessore University of Science and Technology,
Jessore-7408, Bangladesh
ICAP 2015, RU

2. Outlines Introduction Antenna Types of antenna
Microstrip patch antenna
History of microstrip patch antenna
Target of the study
Calculations of patch antenna dimension:
Patch antenna design
Feeding techniques
Simulated results
Applications
Conclusions
Acknowledgement
ICAP 2015, RU

3. Figure 1: A typical antenna used for digital TV.
Introduction
Antenna
A metallic device for radiating or receiving radio waves.
Figure 1: A typical antenna used for digital TV.
Types of Antenna
Wire Antennas
Aperture Antennas
Microstrip Antenna
Reflector Antenna
Lens Antenna
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4. Introduction Microstrip Patch Antenna
In its most basic form, a Microstrip patch antenna consists of a radiating patch on one side of a dielectric substrate which has a ground plane on the other side.
Circular Microstrip Antenna
Different shape of the patch
Figure 2: Circular Microstrip Patch Antenna with different Patch Shape
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5. History of Microstrip Antennas
Introduction
History of Microstrip Antennas
Invented by Bob Munson in 1972 [1]. Became popular starting in the 1970s [2].
Bob Munson
Chief Scientist
Ball Aerospace
Boulder, Colorado
R. E. Munson, Proc. of Twenty-Second Symp. on USAF Antenna Research and Development Program,October 1972.
R. E. Munson, IEEE Trans. Antennas Propagat, vol. AP-22, no. 1, January1974, pp. 74–78.
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6. Target of the study
To design and simulation a circular microstrip patch antenna
To improve the Bandwidth & efficiency of the designed patch antenna.
To reduce the cost of fabrication.
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7. Calculations of Patch Antenna Dimension:
Radius of the Patch (ae):
Before starting the calculations, we need to specify the
Resonant frequency f1 =2.76 GHz & f2= 5.96 GHz.
Dielectric constant for RT/duroid substrate is εr= 2.2.
Height of substrate h= cm.
ae = cm
Length L= 3ae = cm
Width W=L = cm
Feed Point r :
r = .241 cm
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8. Design Dual Band Microstrip Antenna
The desired circular microstrip antenna for multiband operating modes is shown in figure.
(a)
(b)
Figure 3: a) Geometry of dual band antenna with b) E- shape Patch.
E-shaped slot is provided on the patch to get dual band frequencies.
The proposed antenna is excited by coaxial feed line.
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9. Feeding Methods Types of Feeding Techniques Microstrip Line Feed
Coaxial Feed
Proximity coupled Feed
Aperture Coupled Feed
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10. Feeding Methods Coaxial Feeding.
The Coaxial feed or probe feed is a very common technique used for feeding Microstrip patch antennas.
The center conductor of the coaxial connecter is soldered to the patch.
Advantages:
Easy to fabricate and match.
Cavity model can be used.
Low spurious radiation.
Disadvantages:
Narrow bandwidth
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11. Simulation Results Return Losses
Figure 5: Simulated return loss at 2.76 GHz and 5.96 GHz.
The return loss, -28 dB at resonant frequency of 2.76 GHz and that of -34dB at resonant frequency of 5.96 GHz, where -10dB is acceptable for practical applications [3-4].
The bandwidths is 120 MHz at resonant frequency of 2.76 GHz and 400 MHz at resonant frequency of 5.96 GHz are found.
[3 ]. J. T. Aberle and F. Zavosh, Electromagnetics, Vol. 14, 1994, pp. 239–258.
[4]. A. Henderson, J. R. James, and C. M. Hall, Military Microwaves, Vol. MM 86, 1986, pp. 329–334.
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12. Simulation Results Directivity
2D Pattern
(a)
3D Pattern
2D Pattern
(b)
3D Pattern
Figure 6: a) & b) Shows the Simulated directivities at 2.76 GHz & 5.96 GHz.
The directivities are 9.037dB at 2.76 GHz and 7.992dB at 5.96GHz which agree well with the previous results [3-4].
[3 ]. J. T. Aberle and F. Zavosh, Electromagnetics, Vol. 14, 1994, pp. 239–258,.
[4]. A. Henderson, J. R. James, and C. M. Hall, Military Microwaves, Vol. MM 86, 1986, pp. 329–334.
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13. Simulation Results Gain
3D pattern
2D pattern
(a)
(b)
2D pattern
3D pattern
Figure 7: a) & b) Shows the simulated gain at 2.76 GHz & 5.96 GHz.
The designed antenna gives the gain dB and dB at GHz and 5.96 GHz frequencies, respectively which agrees well with the previous results [3-4].
[3 ]. J. T. Aberle and F. Zavosh, Electromagnetics, Vol. 14, 1994, pp. 239–258,.
[4]. A. Henderson, J. R. James, and C. M. Hall, Military Microwaves, Vol. MM 86, 1986, pp. 329–334.
ICAP 2015, RU

14. Applications Used in mobile satellite communication system.
Used in aircraft , spacecraft & missiles.
Direct broad cast television(DBS).
GPS system.
Telemetry & telemedicine.
Radar application Remedies.
Patch antenna on satellite by European Space Agency (ESA)
Placement on Aircraft Platforms
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15. Conclusions
Simple, Small size and high efficiency antenna can be designed.
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 shape of the patch.
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16. Acknowledgements Dr. K. M. Abdus Sobahan Professor
Dept. of Applied Physics, Electronics & Communication Engineering
Islamic University, Kushtia-7003.
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17. THANK YOU ALL
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