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Designing of Miniaturized 4 × 4 Butler Matrix Using Coupled Line Coupler and Schiffman Phase Shifter

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Iranian Journal of Science and Technology, Transactions of Electrical Engineering Aims and scope Submit manuscript

Abstract

A novel and miniaturized 4 × 4 butler matrix (BM) is proposed in this work. This proposed butler matrix is designed with four 3 dB quadrature (90°) forward wave coupled line coupler (FWCC) and two 45° Schiffman phase shifter. This BM is designed at center frequency of 2.4 GHz using FR4 substrate. The crossover of this BM has been replaced with a 0 dB FWCC. The performances of all couplers have been improved with the help of defected ground structures (DGS). Two C-shape and one I-shape DGSs are etched at the ground plane of each coupler, and two C-shape and one dumbbell shape DGSs are etched at the ground plane of 0 dB crossover which enhance the performance of the BM. This proposed BM provides a maximum bandwidth of 120 MHz at each port and occupies a total area of 0.677λ0 (84.74 mm) × 0.612λ0 (76.56 mm).

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Authors and Affiliations

  1. Department of Electronics and Communication Engineering, National Institute of Technology Agartala, Jirania, India

    Partha Kumar Deb, Tamasi Moyra & Bidyut Kumar Bhattacharyya

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  1. Partha Kumar Deb
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  2. Tamasi Moyra
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  3. Bidyut Kumar Bhattacharyya
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Correspondence to Partha Kumar Deb.

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Deb, P.K., Moyra, T. & Bhattacharyya, B.K. Designing of Miniaturized 4 × 4 Butler Matrix Using Coupled Line Coupler and Schiffman Phase Shifter. Iran J Sci Technol Trans Electr Eng 45, 259–268 (2021). https://doi.org/10.1007/s40998-020-00350-4

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  • DOI: https://doi.org/10.1007/s40998-020-00350-4

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