A compact design of a wideband millimeter-wave Butler matrix using integrated passive device technology
- Authors
- Lee, Cheong-Min; Chi, Jung-Geun; Yook, Jong-Min; Kim, Young-Joon
- Issue Date
- Nov-2022
- Publisher
- WILEY
- Keywords
- 5G communication; beamforming network; Butler matrix; integrated passive device; mm-wave; thin-film process
- Citation
- MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, v.64, no.11, pp.1888 - 1894
- Journal Title
- MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
- Volume
- 64
- Number
- 11
- Start Page
- 1888
- End Page
- 1894
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/85441
- DOI
- 10.1002/mop.33392
- ISSN
- 0895-2477
- Abstract
- This study presents a compact, wideband, 4 x 4 Butler matrix using a two-metal-layer thin-film process for millimeter (mm)-wave 5G radio applications. Size reduction techniques are thoroughly discussed for size and performance optimization. A size-reduced quadrature coupler is designed with coplanar waveguide based length-reduced branch lines using capacitive loading effect from the ground bridges. A compact crossover is designed for a return loss of 20 dB or more with negligible crosstalk over a wide frequency range. The circuit components are arranged in an optimized space, allowing negligible coupling between nearby elements. The Butler matrix is fabricated on a quartz substrate at the center frequency of 28 GHz. The fractional bandwidth is 15.4% at a 15-dB return loss and insertion loss is measured in the range of 7.8-8.7 dB at the center frequency. The size of the core circuit is 3.375 x 2.100 m m 2 ${\rm{m}}{{\rm{m}}}<^>{2}$, which corresponds to 0.469 x 0.292 lambda g 2 ${\lambda }_{g}<^>{2}$.
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