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Research of Miniature and Broadband Loading Antenna

Author: LiuYang
Tutor: XiangTieMing
School: Hangzhou University of Electronic Science and Technology
Course: Electromagnetic Field and Microwave Technology
Keywords: Broadband Antenna Miniaturization Load Broadband matching network Genetic Algorithms Real frequency data method
CLC: TN820
Type: Master's thesis
Year: 2011
Downloads: 134
Quote: 0
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Abstract


With the development of communication technology, electronic device structure gradually to the evolution of miniaturization and miniaturization, as well as multi-band, broadband frequency hopping and other modern communication technology, the original narrowband antenna has been unable to meet the modern communication technologies for broadband equipment with the requirements of miniaturization. Miniaturized antenna with broadband communications capacity, interference, etc., to take advantage of the small space, but also for the quality of communication will not cause a greater impact. Monopole by virtue of its simple structure, radiation has many other advantages omni widely used. But how to ensure the performance of the antenna, based on the size of the antenna further reduced, broadening the operating bandwidth of the antenna is a research hotspot in recent years. This article outlines the antenna miniaturization of broadband and the development process, the current broadband antennas to achieve a common approach with the miniaturization and various technical indicators and some key technologies were explored. Draw some significant conclusions, such as increasing the width of the transducer, using the cone structure, the sleeve structure, the antenna feeder and so can increase the asymmetry of the operating bandwidth of the antenna, the use of fractal structure, can effectively reduce the antenna resonant frequency. The antenna structure for a number of line loading method can be used with proper matching network to achieve ultra-wideband performance and miniaturization. These conclusions of this study with broadband antenna miniaturization provides an important theoretical and basis. In this paper, the design of broadband matching networks have been studied, introduced broadband matching network design real frequency data method. This method requires only an antenna on a number of discrete frequency points to obtain impedance input values ??to optimize the design, engineering, strong application, the principle is simple, reliable, and does not ignore the optimal solution for broadband matching network for antenna design method is simple and practical . In previous work, based on this paper loaded antenna matching network design and propose a new optimization method, using FEKO script commands on the antenna modeling, computational input impedance, gain, achieve efficiency field analysis, using ADS Call FEKO resulting file is real frequency input impedance matching network impedance values ??calculated to achieve the road operation. MATLAB prepared by the genetic algorithm were calling these two software, to achieve the integration of the electromagnetic field and circuit simulation, optimization. According to this method, this paper improves the two work in 50-1000MHz and 100-2000MHz ultra wideband monopole antenna, the antenna is increased job stability, produced a physical verification to prove the effectiveness of this method. And then design an omnidirectional radiation characteristics of broadband shortwave folded monopole antenna loaded error analysis of the impact on antenna performance, the final results of the simulation using CST software has been verified. The method is simple, reliable, and loaded in engineering and the antenna matching network integration, optimization of some significance.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Antenna > General issues
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