NDLI: Two-section asymmetric coupled-line impedance transforming directional couplers

Content Provider	IET Digital Library
Author	Wincza, Krzysztof Piekarz, Ilona Gruszczynski, Slawomir
Abstract	Two-section impedance transforming directional couplers have been proposed. It has been shown that such asymmetric coupled-line directional couplers can provide equal power split between the coupled and transmission ports as well as impedance transformation in the same broad frequency range, as classic two-section coupled-line couplers. The theoretical analysis has been presented and appropriate formulas allowing for calculation the required per-unit-length parameters of broadband two-section impedance transforming couplers have been derived. Moreover, it has been shown that the impedance transformation ratio of the presented coupler can be increased by the appropriate modification of the two-section coupled-line directional coupler in a way that the directly fed and coupled-line transformation ratios are different. The proposed modification allows for the design of broadband impedance transforming directional couplers with increased transformation ratio over the limit fixed by the coupling coefficient of the tightly coupled section and having at the same time acceptable impedance match and isolation between the respective ports. The presented theory has been confirmed by the measurements of a two-section 3 dB impedance transforming directional coupler having bandwidth fu /fl = 3:1 and impedance transformation ratio R = 2.
Starting Page	343
Ending Page	350
Page Count	8
ISSN	17518725
Volume Number	9
e-ISSN	17518733
Issue Number	Issue 4, Mar (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/9/4
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2014.0338
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2014-10-21
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Broadband Two-section Impedance Transforming Coupler Coupled Circuit Coupled Transmission Line Directional Couplers Equal Power Split Gain 3 DB Integral Transforms Per-unit-length Parameter Calculation Transform Transmission Port Two-section Asymmetric Coupled-line Impedance Transforming Directional Coupler Waveguide And Microwave Transmission Line Waveguide And Microwave Transmission Line Component
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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