Low-loss design method for a planar dielectric-waveguide branch: effect of a taper of serpentine shape

Author

Tsuji, Mikio ; Tanaka, Osamu ; Shigesawa, Hiroshi

Author_Institution

Dept. of Electron., Doshisha Univ., Kyoto, Japan

Volume

39

Issue

1

fYear

1991

fDate

1/1/1991 12:00:00 AM

Firstpage

6

Lastpage

13

Abstract

A design method is proposed for a planar dielectric waveguide Y branch with low loss caused by radiation. In contrast to the usual design methods, in which the generation of the radiation wave is kept as small as possible, the present method positively uses, for the first time, the behavior of such a radiation wave. The radiation wave at any local position along a taper section of the Y branch is intentionally generated, and its power conversion and reconversion with the surface-wave mode are controlled to reduce the insertion loss for the surface-wave mode. A design example shows that the low-loss Y branch should have a serpentine-shaped taper, which is an unexpected shape compared to the usual design. The effectiveness of the design method presented is confirmed by comparing the numerical results with those of the usual types of Y branches and with measurements

Keywords

dielectric waveguides; optical couplers; waveguide couplers; waveguide theory; low insertion loss; low loss design method; low-loss Y branch; numerical results; open dielectric waveguides; optical waveguides; planar dielectric-waveguide branch; serpentine taper effects; serpentine-shaped taper; surface-wave mode; waveguide Y branch; Coupling circuits; Design methodology; Dielectric losses; Insertion loss; Millimeter wave technology; Optical surface waves; Optical waveguides; Shape; Surface waves; Waveguide junctions;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.64598

Filename

64598