발간년도 : [2017]
| 논문정보 |
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| 논문명(한글) |
[Vol.12, No.4] Design and Implementation of Slot-coupled Microstrip Components for Wideband Butler Matrix |
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| 논문투고자 |
Dong-Hak Lee, Doo-Yeong Yang |
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| 논문내용 |
The design of a slot-coupled directional coupler and a slot-coupled crossover for use in a switched beamforming network operating over wideband has been presented and discussed. In order to achieve wideband characteristics, the coupler and the crossover use slot-coupled microstrip transmission line (MTL) technology. Since the slot-coupled components have a structure in which the two signal lines on the top and bottom side are coupled to each other through the rectangular slot on the common ground plane, the amount of the combined signal is determined by the width of the slot, the width of the line and the height of the substrate. The width of the slot should be set to be wider than the width of signal line to induce proper coupling, and the width of the slot should be about 1.5 times to the width of the signal line. It can be seen that the coupling coefficient increases as the ratio of the width of the line to the height of the substrate increases, which means that the amount of the signal coupled to the output port increases as the width of the line increases. The proposed coupler and the crossover have been obtained high performance of 3±0.5dB coupling, 90±1° phase difference, and 0.5dB coupling and 45±3.5° phase shift in the operating frequency band, respectively. In addition, they have been implemented on the double-layered MTL in a small size and without intersecting lines on microstrip substrate. |
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