NDLI: Miniaturisation of branch line couplers with a compact transmission line topology based on coupled line section

Content Provider	IET Digital Library
Author	Kumar, Mukesh Islam, Sk Nurul Sen, Gobinda Das, Tannistha Mitra Parui, Susanta Kumar Das, Santanu
Abstract	This study presents a compact transmission line topology to reduce the circuit size of single- and two-section branch line couplers (BLCs). The proposed transmission line is composed of a high impedance series line and one coupled line section. The coupled line section consists of two high impedance series lines and one coupled line. The proposed line is analysed with even–odd mode analysis to derive closed-form design equations. To validate the equations, a compact single- and two-section BLCs are designed at 0.85 GHz based on the proposed line. The physical size occupied by the proposed single- and two-section BLCs is 23 and 19.5%, respectively, compared to conventional BLCs. Moreover, the proposed transmission line demonstrates the harmonic suppression characteristic due to the coupled line section. As a result of which, the second- and third-order harmonic of the proposed BLCs are suppressed. The proposed BLCs are designed, fabricated, and tested.
Starting Page	448
Ending Page	455
Page Count	8
ISSN	17518725
Volume Number	14
e-ISSN	17518733
Issue Number	Issue 5, Apr (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/14/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2019.0660
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2020-01-21
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Branch Line Couplers Compact Transmission Line Topology Coupled Line Section Coupled Transmission Line Even–odd Mode Analysis Frequency 0.85 GHz Harmonic Suppression Characteristic High Impedance Series Line Waveguide And Microwave Transmission Line Component Waveguide Couplers
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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