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

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

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 ICAP 2015, RU

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 ICAP 2015, RU

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. ICAP 2015, RU

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. ICAP 2015, RU

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=0.1588 cm. ae = 2.151 cm Length L= 3ae = 6.453 cm Width W=L = 6.453 cm Feed Point r : r = .241 cm ICAP 2015, RU

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. ICAP 2015, RU

Feeding Methods Types of Feeding Techniques Microstrip Line Feed Coaxial Feed Proximity coupled Feed Aperture Coupled Feed ICAP 2015, RU

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 ICAP 2015, RU

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. ICAP 2015, RU

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. ICAP 2015, RU

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 7.819 dB and 7.878 dB at 2.76 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

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 ICAP 2015, RU

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. ICAP 2015, RU

Acknowledgements Dr. K. M. Abdus Sobahan Professor Dept. of Applied Physics, Electronics & Communication Engineering Islamic University, Kushtia-7003. ICAP 2015, RU

THANK YOU ALL ICAP 2015, RU