Title :
Research on the equivalent circuit of microstrip T-junctions and its application on branch-line coupler
Author :
Tian, Ge ; Yang, Jin-Ping ; Cui, Lan ; Wu, Wen ; Shi, Sheng-Cai
Author_Institution :
Ministerial Key Lab. of JGMT, Nanjing Univ. of Sci. & Technol., Nanjing, China
Abstract :
Analysis of microstrip T-junctions based on their equivalent circuit model is introduced in this paper. Explicit design formulas are derived using the admittance-matrix. Improved T-junctions with convex and concave segments are investigated and applied to the branch-line coupler with center frequency of 12GHz. The return loss of the coupler is better than -36.3 dB in all ports with isolation of -43.8 dB at the center frequency, while the amplitude imbalance is below 0.12 dB.
Keywords :
equivalent circuits; matrix algebra; microstrip couplers; microwave circuits; admittance-matrix; amplitude imbalance; branch-line coupler; concave segments; convex segments; equivalent circuit model; frequency 12 GHz; loss -43.8 dB; microstrip T-junction analysis; return loss; Capacitance; Couplers; Equivalent circuits; Integrated circuit modeling; Microstrip; Microwave circuits; T-junctions; admittance-matrix; circuit model; microstrip line;
Conference_Titel :
Microwave and Millimeter Wave Technology (ICMMT), 2012 International Conference on
Conference_Location :
Shenzhen
Print_ISBN :
978-1-4673-2184-6
DOI :
10.1109/ICMMT.2012.6229911
