발간년도 : [2018]
| 논문정보 |
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| 논문명(한글) |
[Vol.13, No.4] Design and Implementation of Butler Matrix Based on Multilayered MTL |
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| 논문투고자 |
Dong-Hak Lee, Doo-Yeong Yang |
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| 논문내용 |
The proposed Butler matrix is capable of controlling the beam direction of array antenna as a feeding system of the beamforming network. The beam pattern of array antenna is controlled by the magnitude and phase of feeding signal, and interval between antenna elements. Therefore, the magnitude and phase of feeding signal supplied to array antenna is used for adjusting the beamforming direction. Designing each component such as the directional coupler, phase shifter and crossover is very important because those decides on the performance of Bulter matrix. In this paper, we propose the 4⨉4 Butler matrix combining three-branch line directional couplers with slot-coupled directional couplers to extend the limited narrow bandwidth, and to reduce the size. Therefore, the Butler matrix circuit is constructed in a multilayer technology and designed without using a crossover on the same layer. The multilayered composition is resolved by using the slot-coupled directional coupler. Finally, the Butler matrix was designed and fabricated on double layered microstrip transmission line (MTL) by the proposed configuration. And also, the simulation results and the measured results were compared for performance analysis each other. As a result, the proposed matrix has good performance that the relative bandwidth, maximum return loss, insertion loss and progressive phase shift are 24%, 15.76dB, 6.5±0.8dB and ± 9.5° in operating frequency band, respectively. |
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