{"title":"A novel RF-MEMS shunt capacitive switch design for dielectric charging mitigation","authors":"Yuhao Liu, Songjie Bi, Yusha Bey, X. Liu","doi":"10.1109/IMWS-AMP.2015.7324955","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324955","url":null,"abstract":"This paper reports on the design, fabrication, and measurement of a new electromechanical implementation for the mitigation of dielectric charging on the signal line and substrate for RF-MEMS shunt switches. Electrostatically shielded, externally-positioned, dielectric-less actuation electrodes with mechanical stoppers are fabricated above the MEMS bridge to isolate the RF and substrate dielectrics from the DC biasing electric fields. In the ON-state, the switch exhibits a measured insertion loss of -0.32dB at 10GHz and -0.69 dB at 20GHz. In the OFF-state, the measured isolation is 15dB at 10GHz and 24dB at 20GHz.","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":"48 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":"86013026","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":"Novel on-chip passive circuits for RF, microwave, millimeter-wave and sub-THz applications","authors":"H. Qian, Xun Luo","doi":"10.1109/IMWS-AMP.2015.7324966","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324966","url":null,"abstract":"In this paper, novel on-chip passive circuits for the RF, microwave, millimeter-wave, and sub-THz applications are introduced. First, an on-chip stacked stepped-impedance (SSI) inductor with an adjusted high quality-factor is analyzed and employed for RF VCO design with low phase-noise performance. Secondly, based on the proposed SSI inductor, a SSI transformer is implemented for the wideband matching network with high passive efficiency for a microwave power amplifier design with a wideband operation (i.e., 3.5-9.5 GHz). Thirdly, a novel on-chip 3D self-shielded capacitor is introduced for mm-wave application, i.e., 60 GHz DCO. Finally, a new slow-wave sub-THz resonant cell is introduced for the dual-resonance (i.e., 237 and 380 GHz) allocation for the dual-band sub-THz application. All the passive circuits mentioned above are fabricated using the silicon-based technology (i.e., CMOS and SiGe). Good agreements between the measurements and simulations are achieved, which verify the feasibility of the proposed circuits for the practical applications.","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":"17 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81825150","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}
Yuan Liang, Hao Yu, Chang Yang, Nan Li, Xiuping Li, Xiong Liu, Junfeng Zhao, Wei Yang, Yuangang Wang
{"title":"CMOS sub-THz on-chip communication with SRR modulator and SPP interconnect","authors":"Yuan Liang, Hao Yu, Chang Yang, Nan Li, Xiuping Li, Xiong Liu, Junfeng Zhao, Wei Yang, Yuangang Wang","doi":"10.1109/IMWS-AMP.2015.7324965","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324965","url":null,"abstract":"Two novel metamaterial devices including Split Ring Resonator (SRR) modulator and Surface Plasmon Polariton (SPP) interconnect (including SPP T-line and coupler) are proposed with CMOS on-chip integration operated at 140GHz. By introducing sub-wavelength periodical corrugation structure onto T-line, SPP is established to propagate signals with strongly localized surface wave, which results in low crosstalk between two back-to-back placed SPP T-lines. Moreover, by stacking two SRR unit-cells with opposite placement, the SRR based modulator manifests itself as a magnetic metamaterial achieving significant reduction of radiation loss with 23dB extinction ratio at sub-THz. As explored in 65nm CMOS, the proposed surface-wave interconnects and SRR modulator have shown great potential for future sub-THz wireline communication in CMOS.","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":"124 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":"88046948","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 tunable high impedance surface electromagnetic band gap metamaterials for RF and microwave applications","authors":"T. Loh, Z. Tian, P. Patel","doi":"10.1109/IMWS-AMP.2015.7324931","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324931","url":null,"abstract":"This paper presents a novel varactor based electronically tunable high impedance surface electromagnetic band-gap (HIS-EBG) metamaterial. The proposed structure is based on two-layer mushroom-like HIS-EBG ground plane, in which by controlling the DC bias voltage on the varactors, the effective capacitance can be adjusted which alters the resonance frequency. To assess the electromagnetic (EM) wave suppression property the structure is incorporated, as the ground plane, in a microstrip transmission line and it is experimentally characterized over the 500 MHz-10 GHz frequency band. Numerical simulations of the transmission coefficient for the whole microstrip system were performed. Both the simulation and measurement results are compared.","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":"89643266","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":"Research on terahertz science and engineering at the state key laboratory of millimeter waves, partner laboratory in City University of Hong Kong","authors":"K. Ng, D. Wang, C. Chan, H. Yi, X. Bai, S. Qu","doi":"10.1109/IMWS-AMP.2015.7324938","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324938","url":null,"abstract":"Summary form only given. In this presentation, we will provide an overview on the research activities on terahertz (THz) science and technology recently conducted at the State Key Laboratory of Millimeter Waves (SKLMW), Partner Laboratory in City University of Hong Kong. SKLMW was established in 2008 with the approval of the Ministry of Science and Technology and our partner is the State Key Laboratory of Millimeter Waves at Southeast University. One of the key research focuses of the laboratory is terahertz science and technology, a highly-interdisciplinary research area. As such, we have internal members not only from electronic engineering but also physics, materials science, biology and chemistry. To promote international collaborations, we also have external lab members from China and UK. To facilitate our research on THz, the laboratory is equipped with an Agilent PNA-X vector network analyzer with extension modules from OML and VDI, covering the full range of 90GHz to 1.1THz. In addition, we also have an EKSPLA THz spectrometer that has a pulse duration of less than 90 fs and a spectral range from 0.1 to 3.5THz.","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":"24 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2015-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73489988","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}
Chenggong Yin, Xi Song, Xinchuan Zhang, Mengjie Zhou, Yongsheng Zhang, N. Zhang, Y. Pei
{"title":"AlGaN/GaN HEMT development targeted for S-band application","authors":"Chenggong Yin, Xi Song, Xinchuan Zhang, Mengjie Zhou, Yongsheng Zhang, N. Zhang, Y. Pei","doi":"10.1109/IMWS-AMP.2015.7324952","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324952","url":null,"abstract":"This paper demonstrates a 180W packaged AlGaN/GaN HEMT targeted for S-band application, operating at 48V drain bias voltage. Under WCDMA (with DPD) test, the average power and drain efficiency are 35W and 33.3%. After 1000 hours HTRB test, no electrical failure of the device is observed.","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":"19 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":"74761872","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":"Analysis of trapping effect in GaN HEMT modeling","authors":"Weiqiang Qian, Mehdi Khan, Dong Huang, F. Lin","doi":"10.1109/IMWS-AMP.2015.7324919","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324919","url":null,"abstract":"This paper presents the large-signal modeling of the trapping effect in GaN HEMT device. Trapping effect leads to strong dispersion from pulsed I-V down to dc scales in GaN device modeling. The trapping mechanism is analyzed in detail. Several published methods have been introduced, to deal with large-signal modeling. A modified Angelov model with drain-lag subcircuit is proposed. This model can reproduce the asymmetrical behavior of traps which include capture and emission processes. It can predict pulse I-V and DC measurement. Comparison results between the measured and modeled I-V data are presented, which demonstrates accurately in different bias condition.","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":"27 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":"78902539","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":"Characterization of multilayer graphene ribbon based THz resonators","authors":"Xiang Li, Linsheng Wu, J. Mao","doi":"10.1109/IMWS-AMP.2015.7324901","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324901","url":null,"abstract":"Graphene has been proved to be one of the promising candidate materials for high-frequency applications. The multilayer graphene ribbon (GR) based resonators are proposed and characterized in this work. The geometry-dependent resonant frequencies (f0) and unloaded Q-factors (Qu) of the GR-based resonators are investigated with the equivalent single conductor (ESC) model. It is found that by intercalation doping with AsF5, the graphene resonators can provide a high Qu of 80.6 at f0=793.1 GHz, superior to the copper and neutral graphene based ones.","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":"58 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":"80918072","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 horizontally polarized 360-degree radiation pattern steerable antenna based on active frequency selective surface","authors":"L. Zhang, Yanhui Liu, L. Ye, Hai Liu, Q. Liu","doi":"10.1109/IMWS-AMP.2015.7324933","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324933","url":null,"abstract":"The possibility of building horizontally polarized, electronically steerable antenna by using active frequency selective surface is investigated. A 10-element electronically steerable antenna is realized by using an omni-directional Alford-loop antenna and active frequency selective surface columns with horizontal polarization sensitive direction. This antenna working at 2.4 GHz WiFi band is 360-degree steerable, and 1.7 dBi additional gain is achieved compared with the original Alford-loop antenna.","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":"191 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":"77759670","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}
Wenhui Li, Shen Yang, Jie-qiu Zhang, S. Sai, Hangying Yuan, S. Qu
{"title":"The RCS reduction of microstrip antenna design based on multi-band metamaterial absorber","authors":"Wenhui Li, Shen Yang, Jie-qiu Zhang, S. Sai, Hangying Yuan, S. Qu","doi":"10.1109/IMWS-AMP.2015.7324998","DOIUrl":"https://doi.org/10.1109/IMWS-AMP.2015.7324998","url":null,"abstract":"A novel kind of highly absorptive multi-band metamaterials absorber (MBMA) is designed to reduce microstrip antenna's radar cross section (RCS) at multi-band. The absorbing property of MBMA is analyzed. Compared to the antenna without the MBMA, the monostatic and bistatic RCS of the proposed antenna are reduced dramatically in-and-out of the antenna working band. Meanwhile, the radiation performance of the proposed antenna remains well kept.","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":"79951770","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}