Analysis of Periodically Loaded Suspended Substrate Structures in Millimeter Wave

Fardis, M.; Khosravi, R.

doi:10.2528/pierb07120901

Cited by 5 publications

(3 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By definition, a CCITL possesses conjugate characteristic impedances Z ± 0 of waves propagating in the opposite directions along the transmission line. Examples of CCITLs are reciprocal lossless uniform TLs, nonreciprocal lossless uniform TLs [8][9][10], exponentially tapered lossless nonuniform TLs [2,11,12] and periodically loaded lossless TLs operated in passband [13][14][15][16][17][18]. Using the ABCD matrix technique, it can be shown that the equation of the input impedance at each terminal of loaded finite lossless periodic structures is in the same form as that of CCITLs [4].…”

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

View full text Add to dashboard Cite

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.

show abstract

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

View full text Add to dashboard Cite

show abstract

“…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]. In general, CCITLs are lossless and possess different characteristic impedances, which are complex conjugate of each other, for waves propagating in opposite directions.…”

Section: Introductionmentioning

confidence: 99%

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

Vudhivorn¹,

Torrungrueng²,

Thimaporn³

2009

PIER M

View full text Add to dashboard Cite

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.

show abstract

“…It was first proposed by Rooney and Underkoefler [1] in 1978. Recently, Fardis and Khosravi [2] extended the scope of SSS to a periodical SSS structure, analyzing its field propagation. Because of their wider range of realizable characteristic impedances and higher reachable quality factors than those of many other planar structures, such as microstrips, striplines, slotlines, and coplanar waveguides, SSS structures have held the edge in filter design.…”

Section: Introductionmentioning

confidence: 99%

Suspended Substrate Stripline Bandpass Filters With Source-Load Coupling Structure Using Lumped and Full-Wave Mixed Approach

Ho¹,

Chen²

2012

PIER

View full text Add to dashboard Cite

Abstract-This paper presents the design of two suspended substrate stripline (SSS) bandpass filters (BPFs), both with a source-load coupling structure embedded to create a transmission zero (TZ) near each side of the passband edges. For the first BPF, the physical circuit layout is proposed first and followed by the establishment of an equivalent LC circuit. The optimization of element values of the LC circuit using a circuit-level simulator leads to quick adjustment of the structural parameters of the physical circuit layout with the aid of a full-wave simulator. For the second BPF, the ingenious equivalent LC circuit modified from that of the first one is proposed for bandwidth enhancement, which is achieved by exciting two extra loaded resonances in the passband. With the element values of the LC circuit optimized, proper reshaping the physical circuit layout from that of the first BPF is easily accomplished. The presented lumped and full-wave mixed approach is very efficient in that the circuitlevel simulator is used to the largest extent and the time-consuming full-wave simulator is employed only at the later stage of the design. Experiments are conducted to verify the design of the two SSS BPFs and agreements are observed between the measured and simulated data.

show abstract

Analysis of Periodically Loaded Suspended Substrate Structures in Millimeter Wave

Cited by 5 publications

References 11 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

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

Suspended Substrate Stripline Bandpass Filters With Source-Load Coupling Structure Using Lumped and Full-Wave Mixed Approach

Contact Info

Product

Resources

About