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  • Rectangularmicrostrippatchantenna

    2. 2. CONTENTS • Introduction • Fundamental parameters of antennas • Rectangular microstrip patch antenna • HFSS • Design specification of rectangular patch antenna • Analysis of patch antenna • Results of patch antenna • Advantage & disadvantage • Application • Conclusion • References
    3. 3. Introduction Antenna is defined as “a usually metallic device (as a rod or wire) for radiating or receiving radio waves.” But as for IEEE standard definitions of terms for antenna or aerial as “a mean for radiating or receiving radio waves.”  Regardless of antenna type, all involve the same basic principle that radiation is produced by accelerated (or de-accelerated) charges.
    4. 4. Types of antennas . Wire antenna . Aperture antenna . Microstrip antenna . Array antenna . Reflector antenna . Lens antenna
    5. 5. Fundamental parameters of antennas . Radiation pattern .Isotropic,directional,and omnidirectional pattern
    6. 6. . Field regions > reactive near field region > radiating near field region > far field region . Radiation intensity . Directivity . Gain . Bandwidth . S-parameter . Z-parameter . VSWR
    7. 7. Rectangular microstrip patch antenna >In general Micro strip antennas are also known as “ PRINTED ANTENNAS ”. >These are mostly used at microwave frequencies >Because the size of the antenna is directly tied to the half wavelength at the resonant frequency. >Micro strip patch antenna or patch antenna is a narrowband wide-beam antenna. >The patch usually fed along the centerline to symmetry and thus minimize excitation of undesirable modes.
    8. 8.  Micro strip antennas are easy to fabricate and comfortable on curved surface .  The directivity is fairly insensitive to the substrate thickness.  Micro strip patch antennas patches are in variety of shapes ,such as rectangular , square, triangular and circulator
    9. 9. . Fringing effect . Effective length, Resonant frequency and effective width
    10. 10. HFSS . HFSS stands for high frequency structure simulator . ANSYS HFSS software is the industry standard for simulating 3-D full wave electromagnetic fields Modes of operation . HFSS 3D model . Electrical CAD interface . HFSS 3D layout
    11. 11. ANSOFT HFSS • Solution Type Driven Model Driven Terminal Eignemode • Parametric model Generation 3D modelling Overview of Draw (Snap,moving) Material View of Model Boundary Condition Assign Port • Analysis Setup Adapt Frequency Convergence criteria Initial Mesh options Adaptive options Low order Basis Function
    12. 12. • Results • Solve loop
    13. 13. Design specification of rectangular patch antenna . 3D model > Ground > substrate > microstrip line(feed) > patch . Assigning boundary . Assigning excitation
    14. 14. Analysis of patch antenna . Analysis setup > solution freq > max number of passes > max Delta S per pass . Freq sweep > starting freq > attenuating freq > number of counting . Analyze
    15. 15. Results of patch antenna . Solution data > matrix data > convergence
    16. 16. > s-parameter > smith chart > 3D polar plot
    17. 17. . Far field reports > radiation pattern in 2D > 3D polar plot > rectangular plot
    18. 18. Advantage & disadvantage .Advantage Easy to fabricate on curved surfaces Easily integrated on MIC circuits Dual frequency and dual polarization can be easily made. Low cost , Less size in volume Mechanically robust on rigid surface  Compatible with modular design .Disadvantage Narrow bandwidth Lower efficiency & gain(nearly 6db) Large ohmic losses in feed structure of arrays Excitation of surface waves Most microstrip antennas radiate into half-space Low power handling capability
    19. 19. Application :- Used in mobile satellite communication system. Used in aircraft , spacecraft & missiles Direct broad cast television(DBS). GPS system. Telemetry & telemedicine Radar application 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 upto 60% by using some special techniques.
    20. 20. Conclusion  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 software………  Simple, small size and high efficiency antenna can be designed
    21. 21. References  C. A. Balanis, “Antenna Theory, Analysis and Design,” John Wiley & Sons, New York,1997.  B.-K. Ang and B.-K. Chung “A wideband e-shaped microstrip patch antenna for 5–6ghz wireless communications”. Progress in Electromagnetics Research, PIER 75, 397–407, 2007  Mr.Anil K.K. leacturer of ECE Department,cochin university college of engineering, CUSAT     