Design and Implementation of Butler Matrix Based on Multilayered MTL (다층 마이크로스트립 전송선 기반 버틀러 매트릭스 설계 및 구현)

Dong Hak Lee (이동학); Doo-Yeong Yang (양두영)

doi:10.34163/jkits.2018.13.4.009

Design and Implementation of Butler Matrix Based on Multilayered MTL

Journal of Knowledge Information Technology and Systems
Abbr : JKITS
2018, 13(4), pp.487-498
DOI : 10.34163/jkits.2018.13.4.009
Publisher : Korea Knowledge Information Technology Society
Research Area : Interdisciplinary Studies > Interdisciplinary Research
Published : August 31, 2018

Dong Hak Lee ¹, Doo-Yeong Yang ²

¹(주)이너트론 R&D 연구소
²제주대학교

Accredited

ABSTRACT

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.

KEYWORDS

Butler matrix, Beamforming network, Branch-line direction coupler, Phase shifter, Crossover, Slot-coupled direction coupler, Multilayer technology, Double layered microstrip transmission line

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* References for papers published after 2023 are currently being built.

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Journal of Knowledge Information Technology and Systems 2023 KCI Impact Factor : 0.89

Design and Implementation of Butler Matrix Based on Multilayered MTL

ABSTRACT

KEYWORDS

Citation status

* References for papers published after 2023 are currently being built.

Journal of Knowledge Information Technology and Systems 2023 KCI Impact Factor : 0.89

Design and Implementation of Butler Matrix Based on Multilayered MTL

ABSTRACT

KEYWORDS

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* References for papers published after 2023 are currently being built.