Dissertation > Excellent graduate degree dissertation topics show

Pattern Reconfirgurable Antenna Optimization and Design Based on Improved Genetic Algrorithm

Author: WangLiPing
Tutor: LiaoCheng
School: Southwest Jiaotong University
Course: Electromagnetic Field and Microwave Technology
Keywords: Genetic Algorithms Optimizer Pattern reconfigurable antenna The same frequency Omnidirectional and directional Beam scanning
CLC: TN822
Type: Master's thesis
Year: 2011
Downloads: 84
Quote: 0
Read: Download Dissertation

Abstract


Reconfigurable antenna technology as a new antenna technology, has been widespread concern of scholars at home and abroad. The reconfigurable antenna in the premise without changing the basic structure of the antenna, by the switching of the switch to change the current distribution, thereby changing the characteristics of the antenna parameters. A reconfigurable antenna can achieve multiple antenna function, it can greatly reduce the number of antennas, to reduce system weight, volume, construction costs, as well as to achieve the purpose of good EMC characteristics. Therefore, the the reconfigurable antennas will have broad application prospects. Present in the reconfigurable antenna, control the constant frequency pattern reconfigurable antenna design more controlled frequency unchanged pattern reconfigurable antenna less design difficulty is also larger, but pattern reconfigurable antenna can effectively improve the system performance. Reconfigurable antenna requirements in various states to achieve the desired performance of the antenna, its design is very complex, so this paper optimization algorithm combined with numerical simulation technology to design pattern reconfigurable antenna. Firstly, improved genetic algorithm to improve the global convergence rate and convergence rate of the algorithm. And then developed a the direction diagram based on the finite element method numerical simulation software and improved genetic algorithm optimization procedures, and as reconfigurable antenna optimization design tool. The reconfigurable antenna composed of micro-element array and switch array optimization design, for example, proved the feasibility and effectiveness of this optimization program. Reconfigurable antenna in the direction of FIG design, improved design having a symmetrical equivalent to the microstrip antenna of the dipole structure, so that the antenna has a small size and broadband characteristics. Combination switch, this writing the optimizer to optimize the antenna structure, were designed the two pattern reconfigurable antenna: 1) the same frequency directional and omnidirectional direction Figure reconfigurable microstrip antenna, in order to achieve the same frequency work, in the the microstrip feeder side increased an adjustable arm, the simulation results show that the antenna to achieve the 3.76-4.3GHz band directional and omni-directional pattern, impedance bandwidth of 13%. At 4GHz, the highest gain 6.7dBi 3.9dBi; 2) with the frequency of the beam scanning direction, FIG reconfigurable microstrip antenna, the antenna has four working states, the main emission direction of the radiation pattern in the XOY plane, respectively quadrants, the working frequency band of 3.67 ~ 4.4 GHz, impedance bandwidth of up to 19%. Compared with the existing literature pattern reconfigurable antenna, the proposed antenna has the advantages of small size and broadband.

Related Dissertations

  1. Design and Research on Stabilization Loop of Gyro Stabilized Pod Control System,V241.5
  2. Study on LC Resonance Charge and POS Based Pulsed Power Supply,TN782
  3. The Research on Ship Imaging Algorithm under the Sea Clutter Background,TN958
  4. Study on Implementation Technology of Channel Estimation in OFDM System Based on DSP,TN919.3
  5. Implementation of Data Compression, Operation and Query Processing System Based on BAP,TP311.13
  6. Research on the Constructions of Several Classes of Sequence Based on Interleaving Techniques,TN911
  7. Development of the on-line Training and Examination System of Army,TP311.52
  8. Designs and Applications of Fuzzy Synthetic Evaluation Models Based on Parallel Algorithms,TP18
  9. Low-frequency elastic wave channel characteristics of the earth,TN914
  10. Acute low-tone sensorineural hearing loss clinical observation,R764
  11. Axial fan blade vibration non-contact measurement,TD441.2
  12. Study of Low Speed Control Strategy on Induction Motor Speed Sensorless,TM343
  13. A Research on Channel Estimation Based on Compressed Sensing for Broadband Wireless Communications,TN92
  14. The Design and Simulation of High-speed Underwater Acoustic Communication Systems,TN929.3
  15. MM-wave Multi-Beam Cylindrical Dielectric Lens Antenna,TN820
  16. Research on Process Optimization of Turbulence Pickling by Hydrochloric Acid Based on Frequency Conversion Technology,TG335.1
  17. Excitation System Design and Research of High-frequency Fatigue Machine,TH871.3
  18. The Study on the System of the Staff Positioning,TP273.5
  19. Research on Song Emotion Classification Methods Combining Music Content and Lyrics,TP391.3
  20. Study on Electromagnetic Bandgap Structure with Bow-tie Units,TN454
  21. A Measuring Research on the Pronouns in A Dream of Red Mansions,H146

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Antenna > Antenna: the band and the wave mode of transmission points
© 2012 www.DissertationTopic.Net  Mobile