Dissertation > Excellent graduate degree dissertation topics show

Lossy Broadband Matching Research Based on Optimization Theory

Author: ChenWenJun
Tutor: ZhuYiSheng
School: Dalian Maritime University
Course: Electronic Science and Technology
Keywords: Lossy Element Broadband Matching Multi-objective Optimization Pareto Front Genetic Algorithm
CLC: TN914
Type: Master's thesis
Year: 2009
Downloads: 74
Quote: 1
Read: Download Dissertation

Abstract


With the development of communication technology, the application of ad-hoc and spread spectrum technique in communication system, modern mobile communication technology call for higher requirement on the broadband of antenna. The lossless broadband matching is an effective technology in the design of antenna matching circuits. However, the variance of antenna’s impedance caused by external environment makes the performance of matching circuit weaken. The thesis mainly discusses how to employ the lossy element to keep the matching circuit from affecting by the impedance change of antenna.In the part of theory, principle of lossless broadband matching and realization of algorithms of multi-objective optimization are introduced. Genetic algorithm and NSGA-II are discussed on detail, which are basement of lossy matching which will be studied in the back.In part of implementing, first, the impact on the matching performance caused by the change of antenna’s impedance is given in the form of the change of transform power gain and voltage standing wave ratio. A case study is made to show the reason that lossy elements is used in matching. Then, after the objectives of lossy matching being given in the form of the S parameter of two-port network, the problem caused by using lossy element is brought forward. Finally, element value optimization for prescribed circuit by using genetic algorithm validates the function of lossy element. The tradeoff between transform power gain and voltage standing wave ratio on the premise of giving resister and Pi attenuator using the NSGA-II, will provide more choice for designers.The application of lossy matching technology to antenna broadband matching is provided elementarily, where many problems still exist. However, it offers a new method for matching circuit to adapt to the change of antenna impedance, which holds guide not only for the matching circuit of antenna, but also other kinds of broadband matching.

Related Dissertations

  1. Development of the Platform for Compressor Optimization Design and Aerodynamic Optimization Design in the Transonic Compressor,TH45
  2. The Application of Fuzzy Comprehensive Evaluation Based on Genetic Algorithm in Vocational Evaluation of Classroom Teaching,G712
  3. Study on Taste Characteristic of Taste Peptide Enzymatic Production from Oyster Base on A Neural Network Method,TS254.4
  4. Design and Realization of the Magnetic Antenna in MW and SW Bands Based on Genetic Algorithm,TN820
  5. Citrus Image Segmentation Based on Genetic Algorithm,TP391.41
  6. Research of Scheduling Algorithm Based on Hybrid Adaptive Genetic Algorithm in Computing Grid,TP393.09
  7. Public Transport Optimal Dispatching Based on the Genetic-Newton Algorithm,TP18
  8. BP network optimization based on genetic algorithm optimization of the biodiesel process,TE667
  9. The Research on Texture Synthesis Technology from Cloud Theory & Been Evolution Genetic Algorithm,TP391.41
  10. Research on Clustering Algorithm Based on Genetic Algorithm and Rough Set Theory,TP18
  11. Research on Subsea Pipeline Repair Coupling,TE973
  12. Mining resources based on genetic algorithm optimization model of,O224
  13. The magnetorheological damper mechanical properties and Gun Recoil,TB535.1
  14. Optimization Study on Gating System and Molding Process Parameters of Injection Mold Based on Simulation,TQ320.662
  15. Research on the Milling Performance and Parameters Optimization with Large Parts of Heavy Machine,TG54
  16. Quantum Genetic Algorithm and Its Application in the Scheduling Problem,TP18
  17. Research of Adaptive Active Noise Control Based on Neural Network,TP183
  18. Modeling and Simulation Software Design for the Glutamic Acid Fermentation,TQ922.1
  19. Sdesign and Implementation of Course Scheduling Management System,TP311.52
  20. Research on Feature Extraction, Selection and Classification Algorithms for Pulmonary CAD,TP391.41
  21. The Research of Explosion Search Algorithm,TP301.6

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication systems ( transmission system)
© 2012 www.DissertationTopic.Net  Mobile