Compensated microstrip coupled line and its application on impedance transformer

Tang, Ching‐Wen; Chen, M.G.

doi:10.1049/el.2012.1174

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…1. The idea of coupled-line impedance transforming circuits has been presented in [1][2][3][4][5][6][7][8][9]. At first, in [1] it has been shown that each line of an asymmetric coupled-line section can be terminated with different impedances.…”

Section: Introductionmentioning

confidence: 99%

“…In [4], coupled and transmission ports are terminated with the same impedance and the impedance transformation occurs only between excited and isolation ports. Another approach is presented in [5,6], where the input impedance is transformed to the coupled port, whereas the transmission port is shortened and the isolation port is terminated with the same impedance as the input port.…”

Section: Introductionmentioning

confidence: 99%

“…However, in such a coupler the terminating impedance of the transmission port is equal to the terminating impedance of the input port, whereas the impedance transformation is provided to the coupled and isolated ports. A different approach has been presented in [3–6]. In [3], a coupled‐line section serves as an impedance transformer having equal terminating impedance of excited and coupled ports and different than the impedances of transmission and isolated ports.…”

Section: Introductionmentioning

confidence: 99%

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Two‐section asymmetric coupled‐line impedance transforming directional couplers

Wincza

Piekarz

Gruszczyński

2015

IET Microwaves, Antennas & Propagation

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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 f u /f l = 3:1 and impedance transformation ratio R = 2.

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