f Derivation of Generalized Design Formulas for Modified Branch-Line Coupler with the Second Harmonic Suppression Characteristics
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Research Article |

Derivation of Generalized Design Formulas for Modified Branch-Line Coupler with the Second Harmonic Suppression Characteristics

Author(s): In-Seon Kim, Hong-Kyun Ryu, Beom-Jun Park, Cheol-Soo Lee and Joo-Rae Park*

Published In : International Journal of Electrical and Electronics Research (IJEER)        Volume 12, Issue 2

Publisher : FOREX Publication

Published : 30 May 2024

e-ISSN : 2347-470X

Page(s) : 540-544

DOI: https://doi.org/10.37391/IJEER.120228

Abstract

We propose a modified branch-line coupler composed of the open stubs and stepped impedance lines. This structure allows the second harmonic suppression and size reduction. We present the steps to transform from a conventional branch-line coupler to the proposed structure using equivalent circuits and derive the generalized design formulas. From the results analysis of the design sample, we demonstrate the validity of the derived formulas. The fabricated branch-line coupler provides more than 30 dB the second harmonic suppression and about 30 % size reduction compared to a conventional branch-line coupler.

Keywords: equivalent circuit, stepped impedance line, design formulas, size reduction, harmonic suppression.




In-Seon Kim, Agency for Defense Development, Daejeon, 34060, Korea Tel: 82-42-821-3545; Fax: 82-42-823-3400

Hong-Kyun Ryu, Agency for Defense Development, Daejeon, 34060, Korea Tel: 82-42-821-3545; Fax: 82-42-823-3400

Beom-Jun Park, Agency for Defense Development, Daejeon, 34060, Korea Tel: 82-42-821-3545; Fax: 82-42-823-3400

Cheol-Soo Lee, Agency for Defense Development, Daejeon, 34060, Korea Tel: 82-42-821-3545; Fax: 82-42-823-3400

Joo-Rae Park*, Agency for Defense Development, Daejeon, 34060, Korea Tel: 82-42-821-3545; Fax: 82-42-823-3400; Email: naechon199@naver.com

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In-Seon Kim, Hong-Kyun Ryu, Beom-Jun Park, Cheol-Soo Lee and Joo-Rae Park (2024), Derivation of Generalized Design Formulas for Modified Branch-Line Coupler with the Second Harmonic Suppression Characteristics. IJEER 12(2), 540-544. DOI: 10.37391/IJEER.120228.