Abstract
Rotman lens is a type of beamforming network with many advantages, such as true-time delay characteristic, multibeam capability, and wide bandwidth. Rotman lens has been used in a wide range of applications in today’s wireless communication systems. However, the size of a conventional Rotman lens is considerably large. So, difficulties may arise with respect to its integration with base station antennas in wireless communication systems. In this study, three techniques for the miniaturization of a Rotman lens, i.e., Chebyshev impedance transformers, power dividers, and truncated ports with energy distribution slots, are introduced to design the Rotman lens to reduce the size of the ports and hence the total area occupied by the Rotman lens. Simulation and measurement results indicate that good impedance matching between the lens body and its feed lines can be achieved. Using the proposed truncated ports with energy distribution slots, the size of the Rotman lens can be greatly reduced without performance degradation or production cost increment. Moreover, two possible applications of the proposed miniaturized Rotman lens to wireless communication systems are investigated. Rotman lens can not only provide multiple phase difference signals along the array ports to realize multibeams, but also generate high-performance formed beams such as flat-topped radiation pattern.
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Attaran A, Rashidzadeh R, Kouki A, 2016. 60 GHz low phase error Rotman lens combined with wideband microstrip antenna array using LTCC technology. IEEE Trans Antenn Propag, 64(12):5172–5180. https://doi.org/10.1109/TAP.2016.2618479
Cheng YJ, Hong W, Wu K, 2010. Design of a substrate integrated waveguide modified R-KR lens for millimetrewave application. IET Microw Antenn Propag, 4(4):484–491. https://doi.org/10.1049/iet-map.2008.0379
Darvazehban A, Manoochehri O, Ali Salari M, et al., 2017. Ultra-wideband scanning antenna array with Rotman lens. IEEE Trans Microw Theory Techn, 65(9):3435–3442. https://doi.org/10.1109/TMTT.2017.2666810
Eom SY, Kim SK, Yook JG, 2008. Multilayered disk array structure surrounded by a dielectric ring for shaping a flat-topped radiation pattern. IEEE Antenn Wirel Propag Lett, 7:374–376. https://doi.org/10.1109/LAWP.2008.2001631
Hansen RC, 1991. Design trades for Rotman lenses. IEEE Trans Antenn Propag, 39(4):464–472. https://doi.org/10.1109/8.81458
Ibbotson A, de Villiers DIL, Palmer KD, 2013. A defocused Rotman lens with reduced conjugate port coupling. IEEE Microw Wirel Compon Lett, 23(8):394–396. https://doi.org/10.1109/LMWC.2013.2268455
Lee W, Kim J, Cho CS, et al., 2010. Beamforming lens antenna on a high resistivity silicon wafer for 60 GHz WPAN. IEEE Trans Antenn Propag, 58(3):706–713. https://doi.org/10.1109/TAP.2009.2039331
Liang QY, Zhou GN, Sun BH, et al., 2018. Compact microstrip Rotman lens using Chebyshev impedance transformers. Progr Electromag Res Lett, 76:1–6.
Liang QY, Sun BH, Zhou GN, et al., 2019. Design of compact Rotman lens using truncated ports with energy distribution slots. IEEE Access, 7:120766–120773. https://doi.org/10.1109/ACCESS.2019.2925000
Liu Y, Yang H, Jin ZS, et al., 2018. Compact Rotman lens-fed slot array antenna with low sidelobes. IET Microw Antenn Propag, 12(5):656–661. https://doi.org/10.1049/iet-map.2017.0466
Mailloux RJ, 1993. Phased Array Antenna. Artech House, London, UK.
Musa L, Smith MS, 1989. Microstrip port design and sidewall absorption for printed Rotman lenses. IEE Proc H Microw Antenn Propag, 136(1):53–59. https://doi.org/10.1049/ip-h-2.1989.0009
Nguyen NT, Sauleau R, Le Coq L, 2011. Reduced-size doubleshell lens antenna with flat-top radiation pattern for indoor communications at millimeter waves. IEEE Trans Antenn Propag, 59(6):2424–2429. https://doi.org/10.1109/TAP.2011.2144554
Rotman W, Turner RF, 1963. Wide-angle microwave lens for line source applications. IEEE Trans Antenn Propag, 11(6):623–632. https://doi.org/10.1109/TAP.1963.1138114
Scattone F, Ettorre M, Sauleau R, et al., 2015. Optimization procedure for planar leaky-wave antennas with flat-topped radiation patterns. IEEE Trans Antenn Propag, 63(12):5854–5859. https://doi.org/10.1109/TAP.2015.2479242
Schulwitz L, Mortazawi A, 2008. A new low loss Rotman lens design using a graded dielectric substrate. IEEE Trans Microw Theory Techn, 56(12):2734–2741. https://doi.org/10.1109/TMTT.2008.2006802
Skobelev SP, 1998. Methods of constructing optimum phased-array antennas for limited field of view. IEEE Antenn Propag Mag, 40(2):39–50. https://doi.org/10.1109/74.683541
Sun L, Zhang GX, Sun BH, 2018. Method of synthesizing orthogonal beam-forming networks using QR decomposition. IEEE Access, 7:325–331. https://doi.org/10.1109/ACCESS.2018.2885358
Ta SX, Choo H, Park I, 2017. Broadband printed-dipole antenna and its arrays for 5G applications. IEEE Antenn Wirel Propag Lett, 16:2183–2186. https://doi.org/10.1109/LAWP.2017.2703850
Tekkouk K, Ettorre M, Le Coq L, et al., 2016. Multibeam SIW slotted waveguide antenna system fed by a compact dual-layer Rotman lens. IEEE Trans Antenn Propag, 64(2):504–514. https://doi.org/10.1109/TAP.2015.2499752
Vo Dai TK, Kilic O, 2016. Compact Rotman lens structure configurations to support millimeter wave devices. Progr Electromag Res B, 71(1):91–106. https://doi.org/10.2528/PIERB16082704
Vo Dai TK, Nguyen T, Kilic O, 2017. A compact microstrip Rotman lens design. United States National Committee of National Radio Science Meeting, p.1–2. https://doi.org/10.1109/USNC-URSI-NRSM.2017.7878311
Young L, 1962. Stepped-impedance transformers and filter prototypes. IRE Trans Microw Theory Techn, 10(5):339–359. https://doi.org/10.1109/TMTT.1962.1125523
Zhang Y, Christie S, Fusco VF, et al., 2012. Reconfigurable beam forming using phase-aligned Rotman lens. IET Microw Antenn Propag, 6(3):326–330. https://doi.org/10.1049/iet-map.2011.0379
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Bao-hua SUN and Qiu-yan LIANG designed the research. Qiu-yan LIANG wrote the first draft. Bao-hua SUN and Gao-nan ZHOU helped organize the manuscript. Bao-hua SUN and Gao-nan ZHOU revised and edited the final version.
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Bao-hua SUN, Qiu-yan LIANG, and Gao-nan ZHOU declare that they have no conflict of interest.
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Sun, Bh., Liang, Qy. & Zhou, Gn. Miniaturized Rotman lens with applications to wireless communication. Front Inform Technol Electron Eng 21, 144–158 (2020). https://doi.org/10.1631/FITEE.1900501
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DOI: https://doi.org/10.1631/FITEE.1900501