| The users of Mobile Communication Network continues to grow rapidly since it has a m ature industry chain, coverages throughout the world, and it provides colorful value-added s ervices. We can effectively improve cell coverage and absorption about signals through the construction of antenna system on large elctrical downtilt(LET), and provide users with bett er service on mobile communication; therefore operators can quickly recover their investmen t. Thus, with the promotion of the diversity and variety of mobile network, the urgency an d importance of LET antenna system construction is more and more prominent.In this thesis, the basic theory of antenna system has been introduced, including the conc ept, composition, implementation and construction processes, etc. Secondly, the design solut ions of LET antenna system including sets of antenna technology indicators and program de sign principles to be followed have been researched. Thirdly, by combining the basic situati on of the environment of sampling point with the previous theoretical studies, the final desi gn of the pilot project LET antenna system has been given, and the feasibility of the progr am has been carried out a detailed avalidation. Finally, the performance of the pilot project LET antenna system has been accepted by approval from three aspects involving cover effec t,call quality and interference test.At the same time, the quality of construction LET antenna system specification contains the actual construction process, the host device and the stand ard installation including the requirements of antenna, feeder lines, passive components,etc.In this thesis, the construction of the LET antenna system system has achieved the antici pated effect by combining theoretical research and engineering practice. The design and rese arch of LET antenna system system adopted in this thesis are in common use for the explo ration of base station construction at high sites. |
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