Design of a 28 GHz Switched Beamforming Antenna System Based on 4×4 Butler Matrix

4×4 버틀러 매트릭스 기반 28 GHz 스위치 빔포밍 안테나 시스템 설계

  • Received : 2015.07.10
  • Accepted : 2015.10.02
  • Published : 2015.10.30


In this paper, a switched beamforming antenna system at 28 GHz frequency band is described for $5^{th}$ generation wireless communication. The butler matrix is used as a beamforming system and it produces linear spaced phase difference at four output ports. Array antenna is designed that can be steered in desired 4 different directions 28 GHz frequency band. Operation of designed butler matrix that composed of couplers and feedline is explained. The antenna system is designed in RO3003 substrate that has a height of 5 mil and dielectric constant of 3. The size of butler matrix is $20.3{\times}13.0mm^2$ and size of array antenna is $21.2{\times}19.9mm^2$. This system can be steered from $-34^{\circ}$ to $33^{\circ}$ and minimum sidelobe level is 12.9 dB.


Beamforming;Switched-Beamforming;Millimeter-Wave;Butler Matrix;Array Antenna


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