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Study of Wideband and Miniaturized Antennas

Author: ZhangFeiFei
Tutor: SunBaoHua
School: Xi'an University of Electronic Science and Technology
Course: Electromagnetic Field and Microwave Technology
Keywords: Miniaturization Broadband Non - Foster circuit Biconical antenna
CLC: TN820
Type: Master's thesis
Year: 2011
Downloads: 185
Quote: 1
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Abstract


On the one hand with the development of modern communication , frequency hopping , spread spectrum and other advanced communication technology has been widely used , on the other hand , with the LSI and the development of space technology development towards miniaturization of electronic devices , people the increasing demands of broadband communications equipment and miniaturization . To meet this requirement , the antenna as a communication device in the front-end components , miniaturization , broadband increasingly attracted attention and become a hot topic in the field of the antenna research . The main work in this paper is summarized as follows : on the basis of the analysis and discussion of antenna miniaturization of passive broadband technology and active antenna broadband miniaturization technology , pointing out that breakthrough the passive antenna objective on the loaded antenna technology based on non - Foster circuit exists bandwidth - gain - volume constraints limit theory (bandwidth restrictions ) . The paper focuses on the non - Foster circuit design method of the loaded antenna , which is characterized by the use of non - Foster circuit load the negative impedance characteristics of the antenna radiator , thereby improving the antenna input impedance characteristics ( input reactance part gently changes ) , used in combination at the same time broadband impedance matching circuit, and the effective exhibition of the wide bandwidth of the antenna , the electrical size of the antenna is reduced . The monopole antenna, for a height of 0.69 meters , the actual design of a non - Foster load circuit and the impedance matching circuit , the antenna voltage standing wave ratio (VSWR) less than 2.0:1 , the far field in the range of 30-150MHz the radiation direction FIG stable , having good broadband compact nature . Demo for an ultra-wideband communication system , the paper designed two omni-directional broadband antenna . Biconical antenna on the basis of the analysis and comparison of multiple broadband antenna form , it is determined as the basic structure of the above two antennas . The a typical biconical antenna structure of the improved design , further exhibition width the antenna bandwidth . Toroid choke other measures taken in order to reduce the impact of the feeder on the antenna performance , . Design and production the two antenna samples , respectively, to work in the 3.2-3.8GHz and 6 of 9GHz band VSWR less than 1.8:1 meet design requirements .

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