Dual Band Microstrip Antenna

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PRESENTATION on dual band microstrip antenna .
Designing and simulation on hfss

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  • Deschamps first proposed the concept of the MSA in 1953practical antennas were developed by Munson and Howell in the1970s.Metallic patches mounted on a dielectric substrateThe radiating patch can be of any shape such as circular, rectangular, triangular, sectoral, annular ring, semicircular .Low profile, conformable to various surfaces, inexpensive, durable, but narrow-band
  • Dual Band Microstrip Antenna

    1. 1. A Project on “ DUAL BAND MICROSTRIP ANTENNA” PRESENTED BY Mr. Kadri Anas (20100354) UNDER GUIDANCE OF Mr. S. V. Khobragade DEPARTMENT OF ELECTRONICS & TELECOMMUNICATION ENGINEERING DR. BABASAHEB AMBEDKAR TECHNOLOGICAL UNIVERSITY LONERE-RAIGAD 2013-2014
    2. 2. Overview.        Antenna Microstrip Patch Antenna Feeding Techniques Advantages/Disadvantages Dual Band Microstrip Antenna Future Work References
    3. 3. Antenna. • A metallic device for radiating or receiving radio waves. • A transitional structure between free space & a guiding device. Types Of Antennas a) Wire Antennas b) Aperture Antennas c) Microstrip Antennas d) Reflector Antennas e) Lens Antennas
    4. 4. Microstrip Antenna. Dielectric substrate Antenna Patch Ground plane o 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.
    5. 5. Basic Principles of Operation.   The patch acts approximately as a resonant cavity (short circuit walls on top and bottom, open-circuit walls on the sides). If the antenna is excited at a resonant frequency, a strong field is set up inside the cavity, and a strong current on the surface of the patch. This produces significant radiation.
    6. 6.  The radiating patch can be of any shape such as circular, rectangular, triangular, sectoral , annular ring, semicircular .  Low profile, conformable to various surfaces, inexpensive, durable, but narrow-band.  For good antenna performance, a thick dielectric substrate having a low dielectric constant is desirable since this provides better efficiency, larger bandwidth and better radiation .  Micro strip patch antenna or patch antenna is a narrow band ,widebeam antenna.  A thicker substrate will increase the radiation power , reduce conductor loss and improve Band width.
    7. 7. Shapes of Microstrip Patch.
    8. 8. Feeding Techniques. 1.Microstrip Line Feed.  A conducting strip is connected to the edge of the patch. The feed can be etched on the substrate. 2.Capacitive Feeding. • In this type of feeding the feeding is done to small aonther patch instead of main radiating patch.
    9. 9. 3. 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: 1.Easy to fabricate and match. 2.Low spurious radiation.  Disadvantages: Narrow bandwidth 
    10. 10. Effects of Key Design Parameters on Antenna Performance       Air Gap Separation Distance Dimensions of Feed Strip Probe Diameter Size and properties of Dielectric substrate Different Shapes of Radiator Patch
    11. 11. Advantages  Low weight and small volume.  Low fabrication cost  Allows linear and circular polarization.  Mechanically robust.  Capable of dual and triple frequency operations.
    12. 12. Disadvantages  Narrow bandwidth  Lower gain  Low power handling capacity.  Spurious feed radiation.  Low efficiency
    13. 13. 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 up to 60% by using Bandwidth Enhancement Techniques.
    14. 14. Dual Band Microstrip Antenna.  In order to design a circular microstrip antenna for multiband applications suitable dielectric substrate of relative permittivity Єr=4.2 and thickness h=1.6mm is chosen.  The circular microstrip antenna has radius=16.625mm.  T-shaped slot with appropriate dimension is provided on the circular patch to get dual band frequencies. • The proposed antenna is probe fed and antenna parameters like Return Loss, VSWR and Radiation pattern at corresponding resonance frequencies are simulated on HFSS.
    15. 15. Return Loss. • The simulation of the proposed antenna is done on HFSS software, Simulation gives dual frequencies at 2.30 GHz and 5.8 GHz. 12
    16. 16. VSWR. • VSWR stands for Voltage Standing Wave Ratio.
    17. 17. Radiation Pattern.
    18. 18. Applications.  Used in Mobile Satellite Communication System.(2.3 GHz)  Wire less LAN’S.(2.3 GHz)  GPS system.(2.3 GHz)  Can also be used for Radio Applications.(5.8 GHz)
    19. 19. References [1] G. Kumar and K. P. Ray, Broadband Microstrip Antennas, Artech House, Norwood, Mass, USA, 2003 [2] C. A. Balanis, Antenna Theory, John Wiley & Sons, Hoboken, NJ, USA, 2nd edition, 2004. [3] R. Garg, P. Bhartia, I. Bahl, and A. Ittipiboon,Microstrip Antenna Design Handbook, Artech House, Norwood, Mass, USA, 2001. [4] A Novel Dual Band Circular Microstrip Antenna , International Journal of Computer Applications. [5]

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