Miniaturized size branch line coupler using open stubs with high-low impedances

• Main Authors: Elhiwaris, M. Y. O., Abdul Rahim, Sharul Kamal, Okonkwo, U. A. K., Md. Jizat, N., Jamlos, M. F.
• Format: Article
• Language: English
• Published: EMW Publishing 2011
• Subjects: TK Electrical engineering. Electronics Nuclear engineering
• Online Access: http://eprints.utm.my/id/eprint/29304/1/SharulKamalAbdulRahim2011_MiniaturizedSizeBranchLineCouplerUsingOpenStubs.pdf; http://eprints.utm.my/id/eprint/29304/; http://dx.doi.org/10.2528/PIERL11022306
• Institution: Universiti Teknologi Malaysia

In this paper, a miniaturized branch-line coupler is proposed. The topology of the circuit is designed using novel design of T-model approach with open stubs with high-low impedances, which provides necessary bandwidth for WLAN band at 2.45 GHz. The miniaturized branch-line coupler is designed and fabricated with a low-cost FR4 substrate as a platform in producing significantly reduction by more than 64.21% compared to the conventional coupler on inexpensive board. Furthermore, the coupler can equally divide the input signal with 90° phase of difference while maintaining the initial power from the source.