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

Volume

1

fYear

2012

fDate

5-8 May 2012

Firstpage

1

Lastpage

4

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave and Millimeter Wave Technology (ICMMT), 2012 International Conference on

Conference_Location

Shenzhen

Print_ISBN

978-1-4673-2184-6

Type

conf

DOI

10.1109/ICMMT.2012.6229911

Filename

6229911