Non-leaky coplanar (NLC) waveguides with conductor backing

Author

Liu, Yaozhong ; Cha, Kimin ; Itoh, Tatsuo

Author_Institution

Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA

Volume

43

Issue

5

fYear

1995

fDate

5/1/1995 12:00:00 AM

Firstpage

1067

Lastpage

1072

Abstract

In this paper, we present a structure called a non-leaky coplanar (NLC) waveguide with conductor backing. It is a multilayered structure with two possible configurations. The spectral domain approach with a complex root searching procedure is used to investigate leakage phenomena. The simulation results confirm that the leakage in conductor-backed coplanar waveguide (CBCPW) occurs in the form of wave in the parallel plate waveguide with infinite width. The results show that the leakage in the multilayered structure can be removed if the geometrical and material parameters of the structure are chosen appropriately. Experiments were carried out to investigate the transmission of these structures. It was found that the resonance in the transmission of finite-width conductor-backed coplanar waveguide (FW-CBCPW) is caused by the energy leakage from the dominant CPW mode. The resonance is eliminated in the NLC waveguides. These NLC waveguides are feasible and practical in the uniplanar MMIC design due to their planar nature

Keywords

MMIC; coplanar waveguides; integrated circuit design; spectral-domain analysis; waveguide theory; complex root searching procedure; conductor backing; dominant CPW mode; energy leakage; geometrical parameters; leakage phenomena; multilayered structure; nonleaky coplanar waveguides; parallel plate waveguide; spectral domain approach; uniplanar MMIC design; Conducting materials; Conductors; Coplanar waveguides; MMICs; Planar waveguides; RLC circuits; Resonance; Slotline; Student members; Transmission line matrix methods;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.382067

Filename

382067