A Novel and Compact Eight-Port Forward-Wave Directional Coupler With Arbitrary Coupling Level Design Using Four-Mode Control Technology

Ting, Hui-Ling; Hsu, S.T.D.; Wu, Tzong‐Lin

doi:10.1109/tmtt.2016.2623709

Cited by 21 publications

(9 citation statements)

References 14 publications

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“…Directional couplers are widely used in different microwave components and networks. These components can be implemented based on different kinds of traditional planar technologies as microstrip lines [1], striplines [2] and substrate integrated waveguides (SIWs) [3]. In all of these substrate based structures, low power handling capacity, high substrate and ohmic losses and undesired radiations may be of concern especially for millimeter-wave frequencies.…”

Section: Introductionmentioning

confidence: 99%

A Wideband 3-dB Directional Coupler in GGW for Use in V-Band Communication Systems

2020

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In this article, a broadband 3-dB directional coupler is proposed using groove gap waveguide (GGW) structures. Gap waveguide technology has been introduced to overcome manufacturing and assembling challenges of different millimeter-wave components and devices. The presented coupler has wideband coupling flatness with low return loss in 60-GHz frequency band and can be easily adapted to other frequency ranges. Experimentally, a sample prototype of the proposed 3-dB coupler has been designed and fabricated. The measured return loss and isolation are better than 20 dB and the power-split unbalance within ±0.5 dB is obtained over the frequency range from 57 to 74 GHz (26% BW). The proposed structure has the capability of easily integrating with other millimeter-wave components. INDEX TERMS Gap waveguide technology, directional coupler, branch-guide.

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Section: Introductionmentioning

confidence: 99%

A Wideband 3-dB Directional Coupler in GGW for Use in V-Band Communication Systems

2020

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“…This is because neither analytical nor equivalent network models are able to account for cross-coupling effects in densely arranged layouts. Examples of relevant high-frequency structures include miniaturized microstrip couplers [8], impedance matching transformers [9], power dividers [10], filters [11], as well as antennas [12][13][14]. Another issue pertinent to compact components is an increased number of geometry variables.…”

Section: Introductionmentioning

confidence: 99%

Efficient Gradient-Based Algorithm with Numerical Derivatives for Expedited Optimization of Multi-Parameter Miniaturized Impedance Matching Transformers

Koziel¹,

Pietrenko‐Dabrowska²

2019

RADIOENGINEERING

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Full-wave electromagnetic (EM) simulation tools have become ubiquitous in the design of microwave components. In some cases, e.g., miniaturized microstrip components, EM analysis is mandatory due to considerable cross-coupling effects that cannot be accounted for otherwise (e.g., by means of equivalent circuits). These effects are particularly pronounced in the structures involving slow-wave compact cells and their numerical optimization is challenging due to expensive simulations and large number of parameters. In this paper, a novel gradient-based procedure with numerical derivatives is proposed for expedited optimization of compact microstrip impedance matching transformers. The method restricts the use of finite differentiation which is replaced for selected parameters by a rank-one Broyden updating formula. The usage of the formula is governed by an acceptance parameter which is made dependent on the parameter space dimensionality. This facilitates handling circuits of various complexities. The proposed approach is validated using three impedance matching transformer circuits with the number of parameters varying from ten to twenty. A significant speedup of up to 50 percent is demonstrated with respect to the reference algorithm. . His research interests include CAD and modeling of microwave and antenna structures, simulation-driven design, surrogate-based optimization, space mapping, circuit theory, analog signal processing, evolutionary computation and numerical analysis. Anna PIETRENKO-DABROWSKA (corresponding author) received the M.Sc. and Ph.D. degrees in Electronic Engineering from Gdansk University of Technology, Poland, in 1998 and 2007, respectively. Currently, she is an Associate Professor with Gdansk University of Technology, Poland. Her research interests include simulationdriven design, design optimization, control theory, modeling of microwave and antenna structures, numerical analysis.

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“…This especially applies to miniaturized structures: due to significant cross‐coupling effects present in the densely arranged layouts, simplified representations (eg, equivalent networks) either cannot be relied on or simply do not exist . The examples of such structures include compact microstrip couplers, power dividers, impedance transformers, and filters . The lack of dependable yet simple equivalent representations affects, to an even greater extent, design optimization of microwave components implemented with the use of slow‐wave structures, such as compact microwave resonant cells (CMRCs) .…”

Section: Introductionmentioning

confidence: 99%

Numerically efficient algorithm for compact microwave device optimization with flexible sensitivity updating scheme

Pietrenko‐Dabrowska

Koziel

2019

Int J RF Microw Comput Aided Eng

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An efficient trust-region algorithm with flexible sensitivity updating management scheme for electromagnetic (EM)-driven design optimization of compact microwave components is proposed. During the optimization process, updating of selected columns of the circuit response Jacobian is performed using a rank-one Broyden formula (BF) replacing finite differentiation (FD). The FD update is omitted for directions sufficiently well aligned with the recent design relocation. As the algorithm converges, the alignment threshold is gradually reduced so that the condition for using BF becomes less stringent. This allows for further reduction of the number of EM simulations involved in the optimization process. The presented flexible Jacobian update scheme allows for considerable reduction of the computational cost with only slight degradation of the design quality. Robustness of the presented algorithm is validated through multiple optimization runs from random initial designs. The verification experiments are conducted for a range of microwave components, including a compact microstrip coupler as well as a threesection compact microwave resonant cell-based impedance transformer. The effects of the alignment threshold value on the computational efficiency of the algorithm and the design quality are investigated. Significant savings reaching 50% as compared to the reference algorithm are demonstrated. K E Y W O R D SBroyden update, design closure, EM-driven design, gradient search, microwave optimization, trust-region framework

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A Novel and Compact Eight-Port Forward-Wave Directional Coupler With Arbitrary Coupling Level Design Using Four-Mode Control Technology

Cited by 21 publications

References 14 publications

A Wideband 3-dB Directional Coupler in GGW for Use in V-Band Communication Systems

A Wideband 3-dB Directional Coupler in GGW for Use in V-Band Communication Systems

Efficient Gradient-Based Algorithm with Numerical Derivatives for Expedited Optimization of Multi-Parameter Miniaturized Impedance Matching Transformers

Numerically efficient algorithm for compact microwave device optimization with flexible sensitivity updating scheme

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