Compact CPW rat-race and branch-line hybrids utilizing slow-wave structure

Author

Fujii, Takao ; Kokubo, Yoshihiro ; Ohta, Isao

Author_Institution

Hyogo Univ., Himeji

fYear

2006

fDate

12-15 Dec. 2006

Firstpage

1349

Lastpage

1352

Abstract

This paper presents structures of artificial coplanar waveguide (CPW) with very slow phase velocity and their applications to a design of compact rat-race and branch-line hybrids. The slow-wave structure is constructed by periodically loading a CPW with simultaneous series inductance and shunt capacitance, and a meaningful reduction of the effective wavelength for a Bloch wave is achieved along with an adequate Bloch impedance. Next, a rat-race and a branch-line hybrid are designed using the artificial CPW´s, and consequently considerable size- reduction of about 1/2 to 1/4 is obtained.

Keywords

coplanar waveguides; Bloch impedance; Bloch wave; artificial coplanar waveguide; branch-line hybrids; compact CPW rat-race; phase velocity; series inductance; shunt capacitance; slow-wave structure; Circuit simulation; Computational modeling; Coplanar waveguides; Distributed parameter circuits; Frequency; Impedance; Microstrip; Scattering parameters; Transmission line matrix methods; Transmission lines; Coplanar waveguide; branch-line hybrid; microwave circuits; rat-race; slow-wave structure;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2006. APMC 2006. Asia-Pacific

Conference_Location

Yokohama

Print_ISBN

978-4-902339-08-6

Electronic_ISBN

978-4-902339-11-6

Type

conf

DOI

10.1109/APMC.2006.4429656

Filename

4429656