Butler Matrix Beam Forming Network for
碩士 === 大葉大學 === 電機工程學系碩士班 === 91 === For the traditional base station antenna with wider azimuth beamwidth will cause the serious effects of multi-path and RF interference。In order to reduce the effects of multi-path and RF interference and increase the channel capacity of communication system，sever...
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| Other Authors: | |
| Format: | Others |
| Language: | zh-TW |
| Published: |
2003
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| Online Access: | http://ndltd.ncl.edu.tw/handle/75894731835242159970 |
| Summary: | 碩士 === 大葉大學 === 電機工程學系碩士班 === 91 === For the traditional base station antenna with wider azimuth beamwidth will cause the serious effects of multi-path and RF interference。In order to reduce the effects of multi-path and RF interference and increase the channel capacity of communication system，several narrower antenna beamwidth will be used instead of single wider antenna beam pattern to reduce the multi-path and RF interference and increase the channel capacity，The wideband MBA can satisfy those requirements。
The MBA (Multiple Beam Antenna) is composed of RF radiator elements、Unequal power divider and Butler matrix BFN (Beam Forming Network) with narrower antenna beamwidth can reduce the effects of multipath and increase the channel capacity。In this paper，four beams in the frequency range from 1.7GHz~2.2GHz generated by the same antenna array。
The 1 2 antenna array of antenna directivity is changing from 9.1dBi to 9.7dBi，The antenna gain is changing from 7.9dBi to 8.8dBi in center frequency。The 4 2 antenna array of four beam directives are 、 ，The antenna directivity is changing from 11.9dBi to 13dBi，The antenna gain is changing from 11.65dBi to 12.5dBi in center frequency，The 3dB beamwidths is changing from 23.6degrees to 24.7degrees。The 4 4 antenna array of four beam directives are 、 ，The antenna directivity is changing from 14.5dBi to 15.2dBi，The antenna gain is changing from 10.65dBi to 13dBi in center frequency，The 3dB beamwidths is changing from 20.8degrees to 27.1degrees。The 4 8 antenna array of four beam directives are 、 ，The antenna directivity is changing from 21.5dBi to 23.4dBi，The antenna gain is changing from 17dBi to 20.3dBi in center frequency，The 3dB beamwidths is changing from 22.5degrees to 23.8degrees。
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