Applications of Microwave Materials: A Review

Raveendran, Athira; Sebastian, Mailadil Thomas; Raman, Sujith

doi:10.1007/s11664-019-07049-1

Cited by 140 publications

(78 citation statements)

References 187 publications

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“…While, glass is a good thermal and homogeneity insulator, it also displays a high dielectric loss 28 . To obtain a lower α d value and maintain the advantages of glass, glass-reinforced ceramics can be used as displayed by R04350 28 . In any event, the dielectric loss of R04350 is still higher than RT5880, TMM4 and RT6010.…”

Section: Andmentioning

confidence: 99%

5G planar branch line coupler design based on the analysis of dielectric constant, loss tangent and quality factor at high frequency

Shukor

Seman

2020

Sci Rep

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This study focuses on the effect of different dielectric properties in the design of 3-dB planar branch line coupler (BLC) using RT5880, RO4350, TMM4 and RT6010, particularly at high frequency of 26 GHz, the fifth generation (5G) operating frequency. The analysis conducted in this study is based on the dielectric constant, loss tangent and quality factor (Q-factor) associated with the dielectric properties of the substrate materials. Accordingly, the substrate that displayed the best performance for high frequency application had the lowest dielectric constant, lowest loss tangent and highest Q-factor (i.e., RT5880), and it was chosen to enhance our proposed 3-dB BLC. This enhanced 3-dB BLC was designed with the inclusion of microstrip-slot stub impedance at each port for bandwidth enhancement, and the proposed prototype had dimensions of 29.9 mm × 19.9 mm. The design and analysis of the proposed 3-dB BLC were accomplished by employing CST Microwave Studio. The performance of scattering parameters and the phase difference of the proposed BLC were then assessed and verified through laboratory measurement.

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Section: Andmentioning

confidence: 99%

5G planar branch line coupler design based on the analysis of dielectric constant, loss tangent and quality factor at high frequency

Shukor

Seman

2020

Sci Rep

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“…In case of significant EMI in the circuitry, several methods can be employed to enhance the immunity of the system such as enhancing the shielding effectiveness using various conductive materials or microwave absorbers, 9,10 making use of EMI filters, 11,12 optimizing the layout of the circuit 13 etc.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Interference (EMI): Measurement and Reduction Techniques

Mathur

Raman

2020

Journal of Elec Materi

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Electromagnetic interference (EMI) is one of the biggest challenges faced during the production of any electronic device. The effect on the performance of the instrument due to these inevitable interferences must be carefully measured to understand and quantify the electromagnetic compatibility (EMC) of the instrument under test. If the EMI profile of the system does not meet the accepted standards, then it becomes necessary to take measures to reduce the influence of these unwanted interferences so that the equipment can be used in the real world. Unfortunately, research and studies on EMI and EMC have not received their due attention from the scientific community. Moreover, the literature available for this area of research is scattered where different sources provide information on one or more (but not all) aspects of EMI/EMC while ignoring the others. With the objective of encompassing this extremely significant area of research in its entirety, this review presents both EMI measurement techniques and EMI reduction techniques in detail. EMI measurement techniques are presented under two sections that deal with emission testing and immunity testing, respectively. Herein, EMI reduction techniques are presented under four sections, where electromagnetic shielding has been given special attention under which various methods used by the scientific community to measure the shielding effectiveness of a material or microwave absorber and its application in EMI reduction are illustrated. This is followed by EMI filters, circuit topology modification and spread spectrum. This review can help students and young scientists in this area to get an idea of the ways to conduct EMI tests as well as the ways that can be employed to reduce the EMI of the system, depending on the application.

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“…Many studies have shown that microwave sintering can greatly shorten the sample preparation process and accelerate crystal growth. This occurs mainly owing to non-thermal and thermal microwave effects [ 2 , 3 , 4 ]. The thermal microwave effect is mainly manifested in differences in thermodynamics, including problems such as faster heating rates and local hot spots [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Microwave on the Crystallization Behavior of CMAS System Glass-Ceramics

Liu

et al. 2020

Materials

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The microwave sintering of glass-ceramics, non-thermal microwave effect, and crystal growth mechanism remain important challenges in materials science. In this study, we focus on developing approaches to affect crystal growth in the glass network of glass-ceramics by microwave heating, rather than performing a single study on the crystal structure and type. Raman spectroscopy is used to detect the structure of the glass network. We demonstrated that the non-thermal microwave effect promoted the diffusion of metal ions, which promoted the aggregation and precipitation of metal ions in the glass network to form crystals. The samples produced by microwave heating contain more non-bridging oxygen bonds than conventional sintered samples; therefore, the non-thermal microwave effect has a depolymerization effect on the glass network of the sample. Under the influence of microwave field, many metal ions precipitate, which precipitates many crystal nuclei. In addition, many active metal ions are captured during the crystal nucleus growth, which shortens the sintering process of glass-ceramics.

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Applications of Microwave Materials: A Review

Cited by 140 publications

References 187 publications

5G planar branch line coupler design based on the analysis of dielectric constant, loss tangent and quality factor at high frequency

5G planar branch line coupler design based on the analysis of dielectric constant, loss tangent and quality factor at high frequency

Electromagnetic Interference (EMI): Measurement and Reduction Techniques

The Effect of Microwave on the Crystallization Behavior of CMAS System Glass-Ceramics

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