Wideband branchline coupler using symmetrical four-strip interdigitated coupler

A wideband 180° branchline coupler with an interdigitated coupler is presented, which is composed of symmetrical four quarter-wavelength strips and replaces a long branch of 3λg/4 length in conventional ring hybrid couplers. Using the proposed structure, this coupler has a wideband performance of 62...

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Bibliographic Details
Published in:Electronics letters 2014-03, Vol.50 (6), p.452-454
Main Author: Jung, Young-Bae
Format: Article
Language:English
Subjects:
Applied sciences
Circuit properties
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
microstrip couplers
microstrip structure
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Microwave technology
phase difference
single dielectric substrate
symmetrical four quarter‐wavelength strips
symmetrical four‐strip interdigitated coupler
waveguide couplers
wideband branchline coupler
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Summary:A wideband 180° branchline coupler with an interdigitated coupler is presented, which is composed of symmetrical four quarter-wavelength strips and replaces a long branch of 3λg/4 length in conventional ring hybrid couplers. Using the proposed structure, this coupler has a wideband performance of 62% at the centre frequency with compact size. Furthermore, an excellent power dividing balance of ±0.25 dB and a phase difference of ±2° between output ports are realised. The proposed coupler is easy to design and fabricate with a single dielectric substrate in a microstrip structure.
ISSN:0013-5194
1350-911X
1350-911X
DOI:10.1049/el.2014.0338