발간년도 : [2017]
| 논문정보 |
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| 논문명(한글) |
[Vol.12, No.4] Implementation of Beamforming Butler Matrix(4×4) Based on Planar Structure for LTE Mobile Communications |
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| 논문투고자 |
Dong-Hak Lee, Doo-Yeong Yang |
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| 논문내용 |
In order to design a beamforming Butler matrix operating in the LTE band of 2.5-2.68GHz, the Butler matrix with a broadband structure was designed by constructing a hybrid coupler and crossover, which are components of Butler matrix, with a multistage branch line structure. The structure and components of the Butler matrix consist of four 3dB hybrid couplers, two crossovers, two -45˚ phase shifters and two equiphase controllers. Among these components, the 3dB hybrid coupler and crossover are designed to have broadband characteristics with a branch line structure in the microstrip substrate. The -45˚ phase shifter and equiphase controller adjust the length of the line to obtain the proper phase, respectively. The designed Butler matrix showed good return loss characteristics of 23.9-34.18dB and relatively small phase error of 5.41˚ in the operating band. And also, when the output signal of the Butler matrix was applied to the microstrip patch array antenna, the effect of the signal amplitude and phase error on beamforming pattern and beam steering direction were studied. As a result, when the Butler matrix has a phase error of about 5.41˚, the direction of the formed beam pattern does not largely change by an error of 1˚, and the beam can be properly steered in a desired direction. |
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