On the Analysis and Design of Three Coupled Microstrip Lines (Short Paper)

Abdallah, Esmat A.; El-Deeb, N.A.

doi:10.1109/tmtt.1985.1133197

Cited by 15 publications

(5 citation statements)

References 11 publications

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“…Fortunately, the analysis of the three line microstrip couplers have been studied and formulated extensively in several works . In fact, a convenient way to describe the behavior of the coupled three‐conductor transmission line above ground is by means of either impedance or admittance matrix.…”

Section: Modified Gysel Power Divider/combinermentioning

confidence: 99%

“…Unfortunately, in the case of three‐line microstrip coupled lines, there is no simple formula relating mode impedances to physical dimensions. As discussed in , the most common practice approaches are based on numerical methods. In a method based on FDTD is selected to evaluate physical dimensions of a three‐line coupler with predetermined mode impedances

Z_{ee}, Z_{oo}

, and

Z_{oe}

.…”

Section: Modified Gysel Power Divider/combinermentioning

confidence: 99%

“…Now, by solving (3) for unknowns

(μ, Z_{ee}, Z_{oo}, Z_{oe})

, physical dimensions

w_{1, 2} / H

and

s / H

are related to mode impedances. It is numerically found that for three equal‐width microstrip lines, the normal mode impedances for the center line will be always greater than the normal mode impedances of the outer lines . On the other hand, the design is much easier for lines having equal impedances for each of three normal modes of propagation.…”

Section: Modified Gysel Power Divider/combinermentioning

confidence: 99%

“…On the other hand, the design is much easier for lines having equal impedances for each of three normal modes of propagation. To satisfy this requirement, the width of the center line should be increased relative to that of the outer lines, . In the case of this work, the width of the center line is set to be twice of the outer lines (

w_{2} = 2 w_{1}

).…”

Section: Modified Gysel Power Divider/combinermentioning

confidence: 99%

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A wide-band gysel power divider/combiner based on a modified marchand balun

Arand

Amrollahzadeh

Kamalzadeh

2017

Microw. Opt. Technol. Lett.

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A wideband two‐way Gysel power divider/combiner is presented based on a modified Marchand balun. With a −15 dB input and output return loss criteria, proposed method has a bandwidth of about 53%, while dimensions are still similar to the conventional Gysel power divider/combiner. The structure of the designed planar microstrip in‐phase power divider is fairly simple, practical, and easily fabricated without requiring complex multiple metal or dielectric layers. In addition to CAD simulation and optimizations, with the aid of even‐ and odd‐mode analysis, a mathematical designing framework is also established. To verify the design approach, the proposed divider/combiner is fabricated and measured at the S‐band of frequency. There is a good agreement between simulation and experimental results. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:949–955, 2017

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Section: Modified Gysel Power Divider/combinermentioning

confidence: 99%

Z_{ee}, Z_{oo}

, and

Z_{oe}

.…”

Section: Modified Gysel Power Divider/combinermentioning

confidence: 99%

“…Now, by solving (3) for unknowns

(μ, Z_{ee}, Z_{oo}, Z_{oe})

, physical dimensions

w_{1, 2} / H

and

s / H

Section: Modified Gysel Power Divider/combinermentioning

confidence: 99%

w_{2} = 2 w_{1}

).…”

Section: Modified Gysel Power Divider/combinermentioning

confidence: 99%

See 2 more Smart Citations

A wide-band gysel power divider/combiner based on a modified marchand balun

Arand

Amrollahzadeh

Kamalzadeh

2017

Microw. Opt. Technol. Lett.

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show abstract

“…The use of three-line microstrip couplers as reflectometers are discussed in [29,30]. However, the design of three-line microstrip directional couplers in the literature again is based on the use of odd and even mode impedance design charts or numerical analysis techniques as outlined in [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Design of Multilayer and Multiline Microstrip Directional Coupler With Closed Form Relations

Eroğlu¹,

Rönnow²

2018

PIER C

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Abstract-Design, simulation, implementation and measurement results of multiline and multilayer microstrip directional couplers are given with closed form relations.Step-by-step design procedure reflecting the design practice of directional couplers, which requires only information on coupling level, port impedances and operational frequency, is presented. The method based on the synthesis technique applied in the design of conventional two-line microstrip symmetrical directional couplers is adapted to design multilayer directional couplers with the aid of electromagnetic simulators using parametric analysis with curve fitting method. The proposed design method is compared with the measurement results and accuracy is verified. It has been also shown that the directivity of the couplers designed using the multilayer structure is improved significantly. A method such as the one presented in this paper can be used to design multilayer two-line and three-line directional couplers which can be integrated to the front end of an RFID systems to provide the required isolation between transmitter and receiver and prevent signal leakage due to use of conventional circulators.

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Coupled-mode analysis of an ideal microstrip six-port directional coupler on an anisotropic substrate

Yu¹,

Rawat²

1997

International Journal of Electronics

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To cite this article: LUKANG YU and BANMALI RAWAT (1997) Coupledmode analysis of an ideal microstrip six-port directional coupler on an anisotropic substrateThe coupled-mode formulation has been applied to simplify the analysis of a symmetrical three-line microstrip coupler (TMC) on an anisotropic substrate. The existence of an ideal six-port directional coupler has been proved under the following conditions: the coupling coe cients of the system are equalized using substrate anisotropy and the lines are matched to their characteristic impedances. The singular behaviour of the normal-mode parameters that occur at the critical equalization point of k l = k c has been examined. The numerical and simulation results con® rm the developed analysis.

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On the Analysis and Design of Three Coupled Microstrip Lines (Short Paper)

Cited by 15 publications

References 11 publications

A wide-band gysel power divider/combiner based on a modified marchand balun

A wide-band gysel power divider/combiner based on a modified marchand balun

Design of Multilayer and Multiline Microstrip Directional Coupler With Closed Form Relations

Coupled-mode analysis of an ideal microstrip six-port directional coupler on an anisotropic substrate

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