A genetic approach to the synthesis of composite right/left-handed transmission line impedance matching sections

Günel, Tayfun

doi:10.1016/j.aeue.2006.07.006

Cited by 12 publications

(7 citation statements)

References 29 publications

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“…According to above analysis of power and amplitude spectrum from reflected and transmission signals based on two-port testing principle, it can be inferred that when detecting brain edema on the system established in this work, f 1 is the ideal detection frequency point for RPS and f 6 is the optimal frequency point for TPS detection. Ideally, the frequency which features in the maximum transmission efficiency should correspond to the frequency of minimum reflection efficiency [37]. In this work, the frequency which features in the maximum amplitude of the transmission signal can be used in both RPS and TPS detection within a certain error range.…”

Section: A Effect Of Frequency On Rpss and Tpss Detectionmentioning

confidence: 99%

A Dual Parameter Synchronous Monitoring System of Brain Edema Based on the Reflection and Transmission Characteristics of Two-Port Test Network

Yang

et al. 2019

IEEE Access

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As a common secondary disease, edema after traumatic brain injury (TBI) can increase brain volume, resulting in elevated intracranial pressure (ICP), brain shift, and cerebral hernia, and can eventually lead to death. The real-time continuous monitoring of edema may significantly reduce mortality and disability. In this paper, a dual-parameter synchronous monitoring system of edema based on the reflection and transmission characteristics of the two-port test network was established; 15 rabbits were chosen to perform 24-h reflection phase shift (RPS) and transmission phase shift (TPS) simultaneously monitoring the experiments of brain edema. With the development of brain edema, the variation law of the RPS and TPS was investigated. Combined with the power amplitude spectrum and the principle of the two-port test network, the influence of frequency on the detection sensitivity of RPS and TPS was analyzed in detail, and the optimal detection frequency point was found. After that, the classification of three different degrees of edema is performed by the BP algorithm. In the animal experiment, the RPS showed a continuous increasing trend within time, and it presented the variation of (9.35910 • ± 1.65702 •), (12.60117 • ± 2.30218 •), and (16.33423 • ± 2.11118 •) after 6, 12, and 24 h, respectively. Meanwhile, the TPS showed a continuous downward trend with the variation of (−12.62555 • ± 0.99441 •), (−19.23976 • ± 1.27488 •), and (−27.26285 • ± 2.62291 •) after 6, 12, and 24 h, respectively. The RPS was negatively correlated with the TPS. The RPS and the TPS together as a recognition feature can achieve 100% accurate classification of three different brain edema severities. Based on these results, it can be concluded that the system established in this paper can monitor gradual increases in brain edema severity. Furthermore, neither the RPS nor the TPS can be set as the recognition feature alone to achieve the completely accurate classification, which shows the necessity of presenting two parameters in the monitoring process. INDEX TERMS Brain edema, two-port test network, synchronous monitoring, classification.

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Section: A Effect Of Frequency On Rpss and Tpss Detectionmentioning

confidence: 99%

A Dual Parameter Synchronous Monitoring System of Brain Edema Based on the Reflection and Transmission Characteristics of Two-Port Test Network

Yang

et al. 2019

IEEE Access

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“…Recently, other works point out the benefits of metasurfaces as impedance matching networks [5,39,40]. On the other hand, several optimization methods without any physical implementation, have been proposed to match the impedance using composite right/lefthanded transmission lines in [41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Metamaterial Impedance Matching Network for Ambient RF-Energy Harvesting Operating at 2.4 GHz and 5 GHz

Coskuner

García‐García

2021

Electronics

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This paper points out the viability of the utilization of metamaterial transmission lines as a multifrequency impedance matching network, improving RF-Energy Harvesting systems operating around 2.4 GHz and 5 GHz. Metamaterial transmission lines introduce additional degrees of freedom in the transmission line design, providing the possibility to match the impedance in multiple bands. The impedance matching structure has been designed and optimized using ADS simulator to match the input impedance of a four-diode-bridge rectifier connected to an energy management system. The proposed Metamaterial Impedance Matching Network (MIMN) has been fabricated using standard PCB technologies and tested in a full operative ambient RF-Energy Harvesting System obtaining a DC output voltage of 1.8 V in a 6.8 mF supercapacitor.

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“…In a CPGA, the parameters constituting a chromosome are coded by a single floating-point number. GA and its versions have been extensively used in microwave theory and electromagnetics [17][18][19][20][21][22]. The other sections of this work are as follows: After the theory is given in Section 2, simulation results are presented and discussed in Section 3.…”

Section: Introductionmentioning

confidence: 99%

Multiwall Carbon Nanotube Impedance Matching Section

Günel¹

2020

PIER Letters

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In this work, computer-aided impedance analysis and genetic-based synthesis of a multiwall carbon nanotube impedance matching section (MWCNTIMS) are proposed. Transmission line model (TLM) of a multiwall carbon nanotube is used for the computer-aided impedance analysis. Continuous parameter genetic algorithm (CPGA) is used for the genetic-based synthesis. A simple, fast, and effective impedance analysis and synthesis approach for an MWCNTIMS is presented. The results of the analysis and synthesis for different examples of MWCNTIMS are given and discussed in detail. The results show that the effect of variation of the distance from the ground plane of the outer shell is very small on the values of input resistance and input reactance. The values of input resistance and input reactance decrease while the value of inner radius or the total number of shells increases. Since the diameter increases with the increasing value of inner radius and the total number of shells, the values of input resistance and input reactance decrease with increasing diameter. While the value of nanotube length increases, the values of input resistance and input reactance increase.

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A genetic approach to the synthesis of composite right/left-handed transmission line impedance matching sections

Cited by 12 publications

References 29 publications

A Dual Parameter Synchronous Monitoring System of Brain Edema Based on the Reflection and Transmission Characteristics of Two-Port Test Network

A Dual Parameter Synchronous Monitoring System of Brain Edema Based on the Reflection and Transmission Characteristics of Two-Port Test Network

Metamaterial Impedance Matching Network for Ambient RF-Energy Harvesting Operating at 2.4 GHz and 5 GHz

Multiwall Carbon Nanotube Impedance Matching Section

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