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题目: Recent Advances in Antenna Theory and Their Applications

报告人: 文舸一  教授

    :  2008年10月10日(上午 10:00-11:30

    东南大学  (四牌楼校区李文正楼  6 614会议室

主办单位东南大学  毫米波国家重点实验室

               IEEE AP-MTT-EMC Joint  Nanjing Chapter

               江苏省电子学会  天线与微波专委会



 In modern wireless terminal design, the antenna is considered as one of the most critical sub-system for achieving high sensitivity, compact size, low power consumption and minimum unwanted radiation. In this regard, some fundamental electromagnetic issues need to be investigated in order to provide guidelines for designing high performance but electrically small antennas. In this presentation, the following issues on small antenna designs will be addressed:


(1) What is best possible performance that the antenna can achieve when its maximum size is specified?  To answer this question, more accurate upper bounds of antenna performances are derived.

(2) Does Foster reactance theorem hold for an antenna? The answer to this question is very important in understanding how antenna works and why there is reciprocal relationship between antenna bandwidth and Q.

(3) How to prove the reciprocal relationship between antenna bandwidth and Q?

(4) How to calculate small antenna Q or bandwidth? How to increase the bandwidth of small antennas? A method for calculating small antenna Q based on the Poynting theorem in both frequency domain and time domain will be presented.

(5) How to establish a simple theory to explain the working principles of handset antennas?

 It will be shown that a “backbone” exists for most metal antennas. Analytical solutions are derived for the backbone.

(6) How to use a single antenna with multiple feeding points to cover all the frequency bands being used in a wireless device (such as from 800MHz to 6GHz)? Some practical examples will be demonstrated.






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