A 28 GHz CMOS Butler matrix for 5G mm‐wave beamforming systems
This paper presents 28 GHz CMOS 8×8 Butler matrix which can improve the beamforming capability in 5G mm‐wave communication systems. The proposed 28 GHz N×N Butler matrix can increase the number of the antenna beam pattern from N to 2N − 1 beams with DP8T switch network including a lumped 180° couple...
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Published in | Microwave and optical technology letters Vol. 62; no. 7; pp. 2499 - 2505 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Hoboken, USA
John Wiley & Sons, Inc
01.07.2020
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Subjects | |
Online Access | Get full text |
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Summary: | This paper presents 28 GHz CMOS 8×8 Butler matrix which can improve the beamforming capability in 5G mm‐wave communication systems. The proposed 28 GHz N×N Butler matrix can increase the number of the antenna beam pattern from N to 2N − 1 beams with DP8T switch network including a lumped 180° coupler, 22.5° phase shifter, and switches. The beamformer is fabricated using 65 nm CMOS process and the size is 1.8 × 2.5 mm2. The DC current consumption is 145 mA (Rx) and 180 mA (Tx) at 2.5 V supply voltage. The proposed 28 GHz CMOS 8×8 Butler Matrix is able to make 15 beam patterns with ±63° beam scan and low sidelobe level, which is suitable in low cost 5G mm‐wave beamforming system. |
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Bibliography: | Funding information Institute of Information & communications Technology Planning & Evaluation (IITP), Grant/Award Number: 1711103182 |
ISSN: | 0895-2477 1098-2760 |
DOI: | 10.1002/mop.32353 |