Design of Broadband CPW Branch-Line 3-dB Couplers

Author

Johnosono, Shinya ; Fujii, Takao ; Ohta, Isao

Author_Institution

Himeji Inst. of Technol., Hyogo Univ.

fYear

2006

fDate

10-15 Sept. 2006

Firstpage

36

Lastpage

39

Abstract

This paper presents a design technique of a broadband CPW branch-line 3-dB coupler with open-circuited quarter-wavelength series-stubs added at each port as a matching network. After describing the design concept, a coupler with series-stubs constructed inside the central strip of each CPW port is designed and a good hybrid performance over a fairly wide bandwidth of 31 percent or more is demonstrated by em-simulations and experiments. In addition, downsizing is attempted by the use of reactive loading onto the series-stubs and the ring line sections, and successfully achieved without destroying the broadband properties

Keywords

coplanar waveguides; directional couplers; microwave circuits; CPW port; broadband CPW branch-line coupler; coplanar waveguide; directional coupler; em simulation; equivalent admittance; matching network; microwave circuit; open-circuited quarter-wavelength series stub; reactive loading; ring line section; Admittance; Bandwidth; Coplanar waveguides; Couplers; Coupling circuits; Frequency; Impedance; Microstrip; Microwave theory and techniques; Strips; Coplanar waveguides; directional couplers; equivalent admittance; hybrids; microwave circuits;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2006. 36th European

Conference_Location

Manchester

Print_ISBN

2-9600551-6-0

Type

conf

DOI

10.1109/EUMC.2006.281175

Filename

4057740