Novel LTCC switchable bandpass filter using vertically short-ended sir

Tang, Hui; Chen, Jianxin; Ge, Yong; Lu, Qimiao; Shi, Jin; Bao, Zhihua

doi:10.1002/mop.28245

Cited by 2 publications

(2 citation statements)

References 13 publications

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“…Since tempering is a diffusion-controlled process involving the re-arrangement of carbon atoms in the microstructure, both temperature and time are expected to influence the tempering response following the Hollomon-Jaffe relationship [6,8]. Large ranges in temperature (from 100 ℃ to 500 ℃) and tempering duration (from 20 s to 10 7 s) have been used to investigate the influence of heat treatments, and the results have shown that the tempering temperature plays a more dominant role [9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Various experimental techniques or apparatus such as X-ray diffraction (XRD), scanning electron microscopy (SEM) or transmission electron microscopy (TEM) have been used to understand the relation between the carbide movement in martensite and heat-treatment temperatures [25]. To date, most of the tempering studies report on the overall performance of the tempered materials and only a few address how individual phase (ferrite and martensite) properties are affected by tempering [9,26]. Even though the reduction of strength disparity between two phases was believed to lead to better formability of DP steels, none of the previous studies cited have attempted at quantifying the effects of tempering on the changes of individual phase properties of a DP980.…”

Section: Introductionmentioning

confidence: 99%

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Quantifying the effects of tempering on individual phase properties of DP980 steel with nanoindentation

Cheng

Zhang

Ruimi

et al. 2016

Materials Science and Engineering: A

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Tempering treatment is conducted on a commercial dual phase (DP) 980 steel at 250 ℃ and 400 ℃ for 60 minutes each. Ferrite and martensite grains are distinguished using electron backscatter diffraction (EBSD) and scanning probe microscopy (SPM), and the martensite volume fractions (MVF) are determined based on the image quality (IQ) map. Indentation tests combined with a newly developed inverse method are used to obtain the individual phase flow properties in each sample. The results show that, i) tempering significantly reduces martensite yield strength, while it slightly reduces the ferrite yield strength; ii) tempering temperature has a more significant influence on the work hardening exponent of ferrite than that of martensite. As a validation, a simple rule-of-mixtures is used to verify the above-predicted individual phase flow stresses with the experimentally obtained overall true stress vs. true strain curves.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantifying the effects of tempering on individual phase properties of DP980 steel with nanoindentation

Cheng

Zhang

Ruimi

et al. 2016

Materials Science and Engineering: A

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Diode Based Reconfigurable Microwave Filters for Cognitive Radio Applications: A Review

et al. 2020

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The cognitive radio paradigm for developing next-century wireless communication systems is rapidly entering the mainstream, and various aspects of it are currently being applied in 5G technology, aeronautical engineering, military communications, emergency, and public safety applications, satellite communication, and healthcare. Cognitive radio focuses on the existence of software defined radio architectures that allow dynamic reconfiguration. Many researchers have taken initiatives in the last decade to achieve the reconfiguration ability in cognitive radio systems to support the concept of dynamic spectrum access. As cognitive radio adapts dynamic spectrum allocation for its users, the physical implementation requires reconfigurable filters that can alter the carrier frequencies and bandwidth. Although there are many ways to reconfigure filter operation, diode based reconfiguration has received utmost attention among researchers because of its shorter response delay and easy implementation. In the last decade, researchers have reported several diode-based reconfigurable filters, including their characteristics such as filter function, filter combination, tuning range, variation in bandwidth, isolation, and resonance. However, to examine the potential of these filters in the application of cognitive radio, a comprehensive review needs to be pursued. In this review article, the descriptions of several diode based reconfigurable filters are illustrated with their exhibiting characteristics. The detailed information provided in this article has disclosed that primarily three different types diode based reconfigurable filters have been reported by researchers: Tunable, Switchable, and Hybrid (Both Tunable and Switchable). It is also found that each type of reconfiguration can further be segregated in terms of filter function, centre frequency variation, and bandwidth variation. The detailed categorization of the reconfiguration presented in this paper provides a systematic approach to select the correct reconfigurable filter for the desired frequency reconfiguration in cognitive radio.

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Novel LTCC switchable bandpass filter using vertically short-ended sir

Cited by 2 publications

References 13 publications

Quantifying the effects of tempering on individual phase properties of DP980 steel with nanoindentation

Quantifying the effects of tempering on individual phase properties of DP980 steel with nanoindentation

Diode Based Reconfigurable Microwave Filters for Cognitive Radio Applications: A Review

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