Compact Single and Dual-Band Branch-Line Coupler with Effective Fractional Bandwidth for Wireless Communication Systems

Authors

  • G. Srividhya Department of ECE Panimalar Engineering College, Poonamallee, Chennai, Tamil Nadu 600123, India https://orcid.org/0000-0003-0976-8326
  • S. Maheswari Department of ECE Panimalar Engineering College, Poonamallee, Chennai, Tamil Nadu 600123, India

DOI:

https://doi.org/10.13052/2024.ACES.J.400607

Keywords:

Branch-line coupler, dual-band branch-line coupler, single-band branch-line coupler, wireless communication systems

Abstract

Multiple wireless communication systems make use of a branch-line coupler (BLC), which is a passive microwave component. For the purpose of splitting and combining microwave signals, as well as providing a 90-degree phase shift between the output ports, this 4-port device is made from four quarter-wavelength (λ/4) transmission lines. Having recently developed a dual-band branch-line coupler (DBBLC), there has been a lot of attention paid to this development. When it comes to getting dual-band (DB) functioning of a BLC, one of the most common approaches is stub loaded transmission lines. For the BLC, stubs may be positioned either in the center of the arms or at the input of the arms. Stepped-impedance stubs, orthogonal coupled branches, and coupled lines are some of the strategies that have been shown to be effective in achieving DB functioning of a coupler. Through the utilization of the Elongated T-Shape Transmission Line (ETSTL), this work presents a one-of-a-kind design for each single-band branch-line coupler (SBBLC) and DBBLC that is of a compact proportion. Based on the information presented in this article, the SBBLC operates at a frequency of 0.9 GHz, whereas the DBBLC operates at 0.9 and 2.4 GHz. Using a fractional bandwidth (FBW) of 44%, the coupler that has been proposed is able to function at both 0.9 GHz (GSM) and 2.4 GHz (wireless). Efforts are done on reducing the size of the coupler to be ready forfabrication.

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Author Biographies

G. Srividhya, Department of ECE Panimalar Engineering College, Poonamallee, Chennai, Tamil Nadu 600123, India

G. Srividhya is currently pursuing her Ph.D. in Information and Communication Engineering at Anna University, Chennai, India. She earned her M.Tech. in VLSI Design from Bharath University, Chennai, India (2013), and B.E. in Electronics and Communication Engineering from SCSVMV University, Kanchipuram, India (2011). She serves as Assistant Professor in the Department of Electronics and Communication Engineering at Panimalar Engineering College, Poonamallee, Chennai, India. She has published extensively in international journals and conferences. Her research interests include VLSI design, RF devices, antenna systems, artificial intelligence, and machine learning, bridging traditional electronics with emerging technologies in modern communication systems.

S. Maheswari, Department of ECE Panimalar Engineering College, Poonamallee, Chennai, Tamil Nadu 600123, India

S. Maheswari received the Ph.D. degree in Microwave Engineering and the M.E. degree in Applied Electronics from Sathyabama Institute of Science and Technology, Chennai, India, in 2016 and 2009, respectively. She received the B.E. degree in ECE from University of Madras. Her area of research includes microwave and millimeter wave circuits. She has more than two decades of teaching experience. Currently she is working as a Professor in Panimalar Engineering College, Chennai, India. She is a recognized supervisor for doing research in Anna University. She has published more than 30 papers in Web of Science, Scopus indexed journals, and IEEE conferences. She is a Fellow of IETE.

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Published

2025-06-30

How to Cite

[1]
G. . Srividhya and S. . Maheswari, “Compact Single and Dual-Band Branch-Line Coupler with Effective Fractional Bandwidth for Wireless Communication Systems”, ACES Journal, vol. 40, no. 06, pp. 541–549, Jun. 2025.

Issue

2025: Vol 40 Iss 6

Section

General Submission

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