Applications of the <i>Z‐Y</i> T‐chart for nonreciprocal stub tuners

Torrungrueng, Danai; Thimaporn, C.

doi:10.1002/mop.20789

Cited by 15 publications

(16 citation statements)

References 2 publications

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“…Next, it is of interest to determine the input impedance Z in,M of the MSTL terminated in the load impedance Z L of 50 Ω at the operating frequency of 3 GHz using the standard analysis based on the ABCD matrix technique (see (3) and (7)) and the analysis based on short-circuited and open-circuited terminations (see (13) to (15) 244.681±j63.073 Ω and β = −54.186+ nπ d (using β = 71.478 rad/m (for n = 2)) [6]. In addition, CCITL parameters of the corresponding NCR case are Z ± 0 = −244.681 ± j63.073 Ω and β = 54.186 rad/m.…”

Section: Numerical Resultsmentioning

confidence: 99%

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Equivalent Graphical Solutions of Terminated Conjugately Characteristic-Impedance Transmission Lines With Non-Negative and Corresponding Negative Characteristic Resistances

Torrungrueng¹,

Lamultree²

2009

PIER

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Abstract-This paper presents the graphical solutions of conjugately characteristic-impedance transmission lines (CCITLs) implemented by periodically loaded lossless transmission lines (TLs), which can exhibit both non-negative (NNCR) and negative characteristic resistances (NCR) with the corresponding propagation constants. The standard T-chart and the extended T-chart are employed to solve CCITL problems with NNCR and NCR cases respectively, depending on the argument of CCITL characteristic impedances. The range of plotting of the standard T-chart and the extended T-chart is always inside or on the unit circle, and always outside or on the unit circle of the voltage reflection coefficient plane, respectively. Two examples of finite periodic TL structures providing both NNCR and NCR cases are given. It is found that both T-charts provide the same input impedance of the corresponding CCITLs as expected, and the standard T-chart is more familiar and easier to deal with.

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Section: Numerical Resultsmentioning

confidence: 99%

“…One class of transmission lines (TLs), called conjugately characteristicimpedance transmission lines (CCITLs), has been introduced recently in the literature [1][2][3][4][5][6][7]. By definition, a CCITL possesses conjugate characteristic impedances Z ± 0 of waves propagating in the opposite directions along the transmission line.…”

Section: Introductionmentioning

confidence: 99%

Equivalent Graphical Solutions of Terminated Conjugately Characteristic-Impedance Transmission Lines With Non-Negative and Corresponding Negative Characteristic Resistances

Torrungrueng¹,

Lamultree²

2009

PIER

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“…Examples of CCITLs are reciprocal lossless uniform transmission lines, nonreciprocal lossless uniform transmission lines, exponentially tapered lossless nonuniform transmission lines, and periodically loaded lossless lines operated in passband [1][2][3][4]. The analytical approach for solving problems associated with CCITLs usually provides quite complex formulae.…”

Section: Introductionmentioning

confidence: 99%

An extended ZY T‐chart for conjugately characteristic‐impedance transmission lines with active characteristic impedances

Torrungrueng

Chou

Krairiksh

2007

Micro & Optical Tech Letters

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It has been shown recently in the literature that the conjugately characteristic‐impedance transmission lines (CCITLs) implemented by periodically loaded lossless lines can exhibit active characteristic impedances (i.e., negative characteristic resistances). In this case, the magnitude of the voltage reflection coefficient is always greater than or equal to unity for passive load termination. Because of this reason, some modifications to the standard T‐chart, a graphical tool for solving CCITL problems, is necessary. The modified chart is called as an extended ZY T‐chart, where the range of plotting is always outside or on the unit circle of the voltage reflection coefficient Γ plane. It is found that the extended chart depends on the angle ϕ, the argument of the CCITL characteristic impedances, in a complicated fashion. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1961–1964, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22626

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“…Conjugately characteristic-impedance transmission lines (CCITLs) have found various applications in microwave technology [1][2][3][4][5][6][7]. Examples of CCITLs are reciprocal lossless uniform transmission lines (TLs), nonreciprocal lossless uniform TLs, exponentially tapered lossless nonuniform TLs [3,8] and periodically loaded lossless TLs operated in passband [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…In the analysis and design of CCITLs, the analytical approach usually provides quite complicated formulas. In contrast, a graphical approach based on the T-chart provides a simpler way to obtain solutions with more physical insight [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Non-Uniqueness of T-Charts for Solving Ccitl Problems With Passive Characteristic Impedances

Vudhivorn¹,

Torrungrueng²,

Thimaporn³

2009

PIER M

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Abstract-Conjugately characteristic-impedance transmission lines (CCITLs) implemented by lossless periodic transmission-line structures have found various applications in microwave technology, and the T-chart was developed to perform the analysis and design of CCITLs effectively. Originally, the normalization factor used in defining normalized impedances of the T-chart is the geometric mean of characteristic impedances of CCITLs, which is not only one possible choice. By using other normalization factors based on characteristic impedances, different graphical representations can be obtained; i.e., T-charts for CCITLs with passive characteristic impedances are not unique, and it depends on the associated normalization factor. In this study, three more possible normalization factors related to characteristic impedances of CCITLs are investigated. It is found that all T-charts for each normalization factor are strongly dependent on the argument of characteristic impedances of CCITLs in a complicated fashion. The original T-chart based on the geometric mean of characteristic impedances is found to be the most convenient graphical representation for solving CCITL problems.

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Applications of the Z‐Y T‐chart for nonreciprocal stub tuners

Abstract: Impedance matching is a part of the design process for a microwave system to achieve the maximum power delivered to the load.

Cited by 15 publications

References 2 publications

Equivalent Graphical Solutions of Terminated Conjugately Characteristic-Impedance Transmission Lines With Non-Negative and Corresponding Negative Characteristic Resistances

Equivalent Graphical Solutions of Terminated Conjugately Characteristic-Impedance Transmission Lines With Non-Negative and Corresponding Negative Characteristic Resistances

An extended ZY T‐chart for conjugately characteristic‐impedance transmission lines with active characteristic impedances

Non-Uniqueness of T-Charts for Solving Ccitl Problems With Passive Characteristic Impedances

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