A Miniaturized Branch Line Coupler for 5G Dual Band Applications

Shallah, Abdulkadir Bello; Zubir, Farid; Rahim, M. K. A.; Abubakar, Ahmad; Yusoff, Zubaida; Aminu-Baba, Murtala

doi:10.1109/isap53582.2022.9998699

Cited by 2 publications

(2 citation statements)

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“…The BLC discussed in this research builds upon the design in [24], so a comprehensive solution of the (1)−(3) can be referred to for reader's understanding. The variations in characteristic impedances, with K, as well as electrical lengths, with the K, are illustrated in Figs.…”

Section: A Dual-band Branch-line Couplermentioning

confidence: 99%

“…Whereas the dual-band 45 • phase shifter designed with the specified parameters effectively operates at the desired frequencies, its overall size is notably large, measuring 107.2 mm × 72.1 mm. A composite right/left handed (CRLH) TL utilizing the interdigital capacitor (IDC) unit cell [31] was integrated into the design to enhance its performance and minimize its footprint. Additionally, the long open stub is replaced with a meandered stub shortened using via, and the miniaturized dimensions were obtained as 38.3 mm × 13.2 mm, which is about 93% less than the conventional T-shaped design.…”

Section: A Dual-band Branch-line Couplermentioning

confidence: 99%

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A Miniaturized Metamaterial-Based Dual-Band 4×4 Butler Matrix With Enhanced Frequency Ratio for Sub-6 GHz 5G Applications

Shallah,

Zubir,

Rahim

et al. 2024

IEEE Access

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This paper introduces an innovative 4×4 dual-band Butler matrix (BM) characterized by compactness and an enhanced frequency ratio (K). The design employs meandered lines and an interdigital capacitor unit cell based composite right/left-handed transmission-line (CRLH-TL) metamaterial (MTM) structure. The BM integrates compact dual-band 3 dB branch-line couplers (BLC), a 0 dB crossover, and a dual-band 45 • phase shifter on a single Rogers RT5880 substrate (with ε r = 2.2 and h = 0.787 mm). Simulations and measurements results demonstrates reflection and isolation coefficients exceeding −20 dB at all ports, with a obtained insertion loss of −6±3 dB over the 0.7 GHz and 3.5 GHz frequency bands. The achieved phase differences of ±45 • , ±135 • , ±135 • , and ±45 • indicate a maximum average phase tolerance of ±4.5 • . Importantly, the BM's overall dimensions are 140 mm × 192 mm, resulting in a 78% size reduction compared to traditional BM designs. The proposed configuration is designed and simulated using CST Microwave Studio, with the agreement between simulated and measured parameters highlighting design reliability and effectiveness. Additionally, a performance evaluation comparing the proposed BM with existing circuits reveals its suitability for sub-6 GHz 5G dual-band antenna array beamforming networks (BFN) due to its compact size and improved band ratio.

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Section: A Dual-band Branch-line Couplermentioning

confidence: 99%

Section: A Dual-band Branch-line Couplermentioning

confidence: 99%