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Study and Design on Compact Wideband and Narrowband Combined Antennas for Spectrum Sensing Applications

Author: XuDongWei
Tutor: LvWenJun
School: Nanjing University of Posts and Telecommunications
Course: Communication and Information System
Keywords: Cognitive radio Ultra-Wideband Small antenna Reconfigurable antenna Center agility
CLC: TN822
Type: Master's thesis
Year: 2012
Downloads: 17
Quote: 0
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Abstract


With the rapid development of modern wireless communication band crowded spectrum resources waste has become an important issue about all kinds of wireless technology applications . In order to improve the utilization of the spectrum resources , derived from the concept of \According to the characteristics and requirements of cognitive radio , the antenna should have a broadband antenna with unit \How to efficiently analyze and develop wide - narrow - band antenna combinations , how to effectively reduce the volume of the antenna and to maintain the performance of the antenna , and how to to reduce antenna research and development and manufacturing costs , are very difficult key technologies , this paper studies the small width - narrowband the combination of antenna theory and analysis methods , proposed and a detailed study of the small width of the new structure - combined narrowband antenna . The full text of the main work includes : (1 ) The paper first discusses the concept of cognitive radio and antenna design requirements , elaborate works and analytical methods of the microstrip antenna , reconfigurable basic principles and types of antennas and antenna diversity technology for small width - combined narrowband antenna provides a theoretical basis , and for a reasonable explanation of the small width - the working mechanism of the narrow - band antenna combinations . (2) first studied on the basis of theoretical studies , a single ultra-wideband antenna for broadband dipole antenna unit \Study the most simple monopole antenna design rectangular UWB antenna plus inverted trapezoidal shape . Then on the basis of a single ultra-wideband antenna the study limited space width - the coexistence of the combined narrowband antenna . Antenna diversity technology as the theoretical basis , design a small , high isolation wide - narrow-band combination antenna . Finally , on the small width - the basis of the narrowband antenna combinations , research center frequency of the narrow - band sub-antenna unit \Design the reactance element load small wide - narrow-band combination antenna has a function of frequency agility . (3) using electromagnetic simulation software IE3D extensive auxiliary calculation, respectively produced a width - narrow - band combination antenna , and ultra-wideband diversity antenna sample of the experimental measurements , the effects of the actual performance of these antennas .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Antenna > Antenna: the band and the wave mode of transmission points
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