2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)最新文献

{"title":"Manipulating electromagnetic local density of states by graphene plasmonics","authors":"Yongpin P. Chen, W. Sha, L. J. Jiang, Jun Hu","doi":"10.1109/IMWS-AMP.2015.7325037","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7325037","url":null,"abstract":"Electromagnetic local density of states (ELDOS) counts the number of electromagnetic modes at a spatial point where a particle (atom, molecule, and quantum dot) spontaneously emits electromagnetic waves. ELDOS can be interpreted as a density of vacuum fluctuations of electromagnetic fields. Moreover, ELDOS is essential to control spontaneous decay rate (SDR) of particles; and thus plays a critical role in modern optical and quantum devices. Having a great degree of freedom to tune permittivity, graphene is an emerging building block to manipulate the ELDOS. In this work, we study SDR of a particle near a metallic split-ring resonator, which is embedded in a multilayered substrate incorporating a graphene layer. Analyzing ELDOS in such a complex multilayered system is not only computationally challenging but also highly important to practical devices. First, dispersion relations of graphene plasmonics and metallic plasmonics are comparatively studied. From our investigations, graphene offers several flexible tuning routes to control SDR, which highly depends on the chemical potential of graphene sheet and the position and polarization of particle. Then, considering graphene plasmonics is excited at infrared regime, we carefully design a metallic split-ring resonating around the same frequency range. Consequently, this design allows a mutual interaction between the graphene sheet and split-ring. To reduce the computational burden, boundary element method in conjugation with a multilayered medium Green's function is adopted. The multilayered medium Green's function automatically includes the information of the ultrathin graphene. Therefore, only the split-ring scatterer is meshed. Blue-shifted and splitting resonance peaks are theoretically observed, which suggests a strong mode coupling between the graphene and split-ring. Furthermore, the mode coupling has a switch on-off feature via electrostatically doping the graphene sheet. This work is fundamentally important to dynamically tune ELDOS and SDR in complex devices.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"11 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86634315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of graphene and other 2D material: The past and future of chemical vapor deposition","authors":"S. Pei, Q. Yu, K. P. Huang, S. Xing, S. Chang, R. Ebrahim, F. Mansurov","doi":"10.1109/IMWS-AMP.2015.7324942","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324942","url":null,"abstract":"Over the past seven years, chemical vapor deposition has emerged as the preferred technique for the synthesis of graphene films on metal as well as other substrates. Commercial cell phones with a graphene touch screen have been introduced and roll-to-roll production tools have been demonstrated. The deposition temperature is also reduced from >1000°C to ~400°C with a plasma-enhanced process. For device applications, a seeded growth of single-crystal graphene at predetermined location technique has been developed to avoid the detrimental effects of the grain boundaries. The application of chemical vapor deposition and seeded growth to transition metal dichalcogenides is now under investigation.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"89 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86019172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Passive wireless gas sensors based on the LTCC technique","authors":"Mingsheng Ma, Zhifu Liu, Wei Shan, Yongxiang Li, K. Kalantar-zadeh, W. Wlodarski","doi":"10.1109/IMWS-AMP.2015.7325052","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7325052","url":null,"abstract":"Many of the existing gas sensors cannot offer long-term continuous performance, rendering them selected ineffective for environmental and point-of-care monitoring tasks. The problem may arise from the limitation in accessible power supplies for their operation and signal communications. As a solution, a wireless passive gas sensor based on low temperature co-fired ceramic (LTCC) technology is presented in this work. The sensor consists of a planar inductor-interdigital capacitor resonant antenna circuit, covered with gas sensitive coatings. The antenna together with this pair of interdigital electrodes was fabricated using the LTCC process. Gas sensitive films were made of two dimensional tin disulfide (SnS2) nanostructures, which were deposited on the interdigital electrodes by drop-casting method. The gas sensing performance was investigated by monitoring the impedance phase angle changes of the antenna in response to different gas types and concentrations.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"62 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82956798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Subwavelength prestressed microcantilevers based metamaterials for efficient manipulation of terahertz waves","authors":"Prakash Pitchappa, C. Ho, Chengkuo Lee","doi":"10.1109/IMWS-AMP.2015.7324981","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324981","url":null,"abstract":"We report an array of prestressed MEMS cantilever as active metamaterial for dynamic manipulation of terahertz waves. The electrostatically actuated microcantilevers integrated into split ring resonator and electrical split ring resonator unit cell, further enables active tuning of magnetic and electrical resonance, respectively. The actuation method of these bimaterial cantilevers is expanded using electrothermal and fluid flow methods. The simple MEMS microcantilevers is highly versatile with attractive electro-optic response and forms a technology platform for numerous terahertz applications in the future.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"1 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82978005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A beam-steerable metamaterial lens using varactor diodes","authors":"Z. Wu, W. Tang, T. Cui","doi":"10.1109/IMWS-AMP.2015.7324902","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324902","url":null,"abstract":"A method to design and realize the beam-steerable lens is proposed and tested in this paper. Such a lens is composed with varactor-diodes-loaded metamaterials. The electromagnetic properties of the lens, in particular, the refractive index distribution, can be controlled by reverse bias voltages added to the metamaterials. Therefore, the lens obtains flexible beam forming functions when a variety of reverse bias voltages are applied. A prototype of the lens is manufactured, and its beam-forming function is successfully demonstrated in experiment.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"26 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78663187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrathin metasurface based on phase discontinuity with maximal cross-polarization efficiency","authors":"Xumin Ding, Lei Zhang, Kuang Zhang, Qun Wu, C. Qiu","doi":"10.1109/IMWS-AMP.2015.7324987","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324987","url":null,"abstract":"An ultrathin flat metasurface experimentally realizing bi-functional microwave manipulation has been demonstrated to be able to approach the theoretical limit of cross-polarization (cross-pol) conversion efficiency of the transmission. With the excitation of a localized waveguide mode, an abrupt helicity-dependent phase change is introduced to the transmission and can be engineered by assembling the spatial orientation of each Pancharatnam-Berry phase element. By realizing a constant phase gradient, an anomalous refraction is unanimously demonstrated under circular polarized incident wave. Besides, due to the helicity-dependent phase modification, we also demonstrate an ultra-thin metalens with bi-functionality. By controlling the handedness of the incident wave, converging and diverging functions are interchangeable with the same flat lens. The proposed metalens has only one single layer as thin as 0.001λ, which massively reduces the thickness of the microwave lens along the wave propagation direction. With the great improvements in efficiency and thickness reduction, our design provides a promising approach to miniaturize, planarize and integrate multiple microwave components.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"65 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89245037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An improved equivalent circuit model for C/D CRLH TL metamaterials","authors":"N. Kou, Yan Shi, Long Li","doi":"10.1109/IMWS-AMP.2015.7325030","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7325030","url":null,"abstract":"This paper proposes an improved equivalent circuit model for the composite right/left-handed transmission line (CRLH TL) and Dual-CRLH (DCRLH) TL unit cells. A pseudo-inverse technique is first implemented to extract the primary equivalent circuit. By using the conventional filter synthesis technique, the retrieval primary equivalent circuit is further transformed to a typical band-pass/band-stop filter circuit as the secondary equivalent circuit. With two-step retrieval procedure, the response of the secondary equivalent circuit can more accurately agree with that of CRLH/DCRLH TL unit cell in magnitude and phase of S parameters. Numerical results are given to demonstrate good performance of the proposed synthesis method.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"83 1-2 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78217588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel extraction approach of extrinsic and intrinsic parameters of InGaAs/GaN pHEMTs","authors":"Andong Huang, Z. Zhong, Yong-xin Guo, Wen Wu","doi":"10.1109/IMWS-AMP.2015.7324994","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324994","url":null,"abstract":"A novel extraction approach of extrinsic and intrinsic parameters of InGaAs/GaN pHEMTs is presented, for the first time, artificial bee colony algorithm is applied to the global-optimization based parameter extraction and a novel intrinsic Y-parameter error function is proposed, which is not sensitive to noise and measurement uncertainty, and also highly consistent to the overall S-parameter error function. The extrinsic elements are optimized at multi-bias points and the intrinsic ones at specific bias points. Only broad ranges of extrinsic parameters are required, and the extraction is unique and accurate. This method has been verified by 2 × 75 and 4 ×100 um gate width InGaAs pHEMTs from 1 GHz to 40 GHz. Excellent agreement is achieved between the measured and modeled S-parameters at all the biases and the conservation of the gate charge is well satisfied which further validates this novel extraction method.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"46 77","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91510846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"3-D near-field millimeter wave imaging based on stepped frequency system","authors":"Yu Sun, Wei-dong Hu, Xiangxin Meng, X. Lv","doi":"10.1109/IMWS-AMP.2015.7324913","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324913","url":null,"abstract":"Millimeter wave have many advantages compared with microwave, a millimeter wave radar system based on stepped frequency pulse signal can be used to near-field imaging. The wave number domain algorithm is used to mechanical scanning data that achieved by a two-dimensional (2-D) planar aperture with the radar system to reconstruct three-dimensional (3-D) reflectivity image. Results show the efficiency and accurate image reconstruction and highly resolution.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"64 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78197385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A differentially-driven rectifier for enhanced RF power harvesting","authors":"Hucheng Sun, Guangzu Xu","doi":"10.1109/IMWS-AMP.2015.7324976","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324976","url":null,"abstract":"This paper presents a differentially-driven rectifier for enhanced RF power harvesting. Based on a traditional one-fed rectifier, a differentially-driven rectifier is designed, whose RF-to-DC power conversion efficiency (PCE) is roughly the same as that of the traditional one. The performance of the differentially-driven rectifier is verified by both simulation and measurement results. The measured RF-to-DC PCE of the proposed differentially-driven rectifier achieves its maximum value of 73.9% when the input power level is 9.4 dBm.","PeriodicalId":6625,"journal":{"name":"2015 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP)","volume":"45 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78663554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}