A new class of multisection 180° hybrids based on cascadable hybrid-ring couplers

Author

Ang, Kian Sen ; Leong, Yoke Choy ; Lee, Chee How

Author_Institution

Defence Sci. Organ. Nat. Labs., Singapore, Singapore

Volume

50

Issue

9

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

2147

Lastpage

2152

Abstract

A new class of multisection 180° hybrids is presented in this paper. It is based on the hybrid-ring coupler that has been reconfigured such that multiple sections can be conveniently cascaded together. The main limitations of the conventional hybrid-ring coupler are its limited bandwidth, large size, and the impracticably high-impedance levels required for large power-split ratios. These limitations are readily overcome using the multisection cascadable 180° hybrids. Simple design equations based on the scattering matrix and experimental verifications of the theoretical results for two-section 180° hybrids are presented

Keywords

S-matrix theory; microstrip directional couplers; bandwidth; cascadable hybrid-ring couplers; design equations; low-cost FR-4 board; microstrips; multisection 180 degree hybrids; power-split ratios; scattering matrix; Bandwidth; Coupling circuits; Directional couplers; Equations; Helium; Impedance; Microstrip; Microwave circuits; Scattering; 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/TMTT.2002.802328

Filename

1028959