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High Frequency Postgraduate Student Colloquium, 2005最新文献

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Design and fabrication of modulation doped charge coupled devices for transversal filter applications 用于横向滤波器的调制掺杂电荷耦合器件的设计与制造
High Frequency Postgraduate Student Colloquium, 2005 Pub Date : 2005-12-01 DOI: 10.1109/HFPSC.2005.1566368
H. T. Tan, I. Hunter, C. Snowden, R. Ranson
{"title":"Design and fabrication of modulation doped charge coupled devices for transversal filter applications","authors":"H. T. Tan, I. Hunter, C. Snowden, R. Ranson","doi":"10.1109/HFPSC.2005.1566368","DOIUrl":"https://doi.org/10.1109/HFPSC.2005.1566368","url":null,"abstract":"This paper presents the first reported quarter-micron double delta doped AlGaAs/InGaAs charge coupled device for microwave frequency filter applications. The design and fabrication of conventional and multi tapped delay line MMICs for RF filter applications are also discussed. The device is implemented as a recessed capacitive gate structure which is fabricated using established GaAs heterostructure MMIC technology to ensure good repeatability. In transistor mode, the three stage device behaved as a multi-gated pseudomorphic high electron mobility transistor with a drain-source saturation current of 32 mA and an off-state drain-gate breakdown voltage of 2.8 V.","PeriodicalId":312723,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2005","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134471367","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}
引用次数: 2
An improved chromatic dispersion compensation technique employing an optical all pass filter equaliser in a 10 Gb/s optical system 在10gb /s光学系统中采用全通滤波均衡器的色散补偿技术的改进
High Frequency Postgraduate Student Colloquium, 2005 Pub Date : 2005-09-05 DOI: 10.1109/HFPSC.2005.1566375
W. Loedhammacakra, W. P. Ng, R. Cryan
{"title":"An improved chromatic dispersion compensation technique employing an optical all pass filter equaliser in a 10 Gb/s optical system","authors":"W. Loedhammacakra, W. P. Ng, R. Cryan","doi":"10.1109/HFPSC.2005.1566375","DOIUrl":"https://doi.org/10.1109/HFPSC.2005.1566375","url":null,"abstract":"The chromatic dispersion (CD) of a single mode fibre (SMF) is an important issue in a long haul optical communication system when the new generation of optical system is introduced operating at the wavelength of 1.55 /spl mu/m with the bit rate of 10 Gb/s. The CD effect will result in pulse spreading and causes inter-symbol interference (ISI). This paper proposes a promising technique to compensate CD by using an optical all pass filter (OAPF) as an equaliser. The phase response of OAPF will be designed to equalise the phase delay of SMF which is the main cause of CD. The simulation of the mathematical model of the optical system at 10 Gb/s employing the proposed OAPF will be presented. A minimum mean square error technique was used to optimise the equaliser and the simulation results show the pulse spread improvement of 33% and fully compensated were achieved at full-width half-maximum (FWHM) for 100 and 160 km of SMF. respectively. The eye diagram also shows an improvement of 32 dB in dispersion penalty when OAPF equaliser is used at a distance of 160 km.","PeriodicalId":312723,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2005","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129205119","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}
引用次数: 1
A broadband envelope load pull system 宽带包络负载拉拔系统
High Frequency Postgraduate Student Colloquium, 2005 Pub Date : 2005-09-05 DOI: 10.1109/HFPSC.2005.1566352
O.A. Kharji, T. Williams, J. Benedikt, P. Tasker
{"title":"A broadband envelope load pull system","authors":"O.A. Kharji, T. Williams, J. Benedikt, P. Tasker","doi":"10.1109/HFPSC.2005.1566352","DOIUrl":"https://doi.org/10.1109/HFPSC.2005.1566352","url":null,"abstract":"The paper presents an active envelope load-pull system for the active control of load impedance over a bandwidth of approximately 100 MHz, hence extending the employment of active load pull systems to modulated signals. As a result, the load-pull system can be also employed for linearity investigations of non-linear devices, which is crucial for telecommunication systems. Moreover, the presented load pull system offers the complete control of the impedances within the bandwidth and allows for novel applications such as accurate emulation of complete PA matching circuits over the entire operational bandwidth.","PeriodicalId":312723,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2005","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131653636","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}
引用次数: 1
Beam steering reflectarrays using liquid crystal substrate 采用液晶基板的光束转向反射
High Frequency Postgraduate Student Colloquium, 2005 Pub Date : 2005-09-05 DOI: 10.1109/HFPSC.2005.1566363
M. Ismail, R. Cahill
{"title":"Beam steering reflectarrays using liquid crystal substrate","authors":"M. Ismail, R. Cahill","doi":"10.1109/HFPSC.2005.1566363","DOIUrl":"https://doi.org/10.1109/HFPSC.2005.1566363","url":null,"abstract":"Radar acquisition and tracking systems often require the generation of single or multiple dynamically reconfigurable beams, which must be steered rapidly within the scan volume. Microstrip phased arrays are often used for these applications because this type of antenna can normally be designed to satisfy the pattern shape and coverage requirements and the beam can be scanned simply by varying the phase of the individual elements in the periodic structure. In this paper we present the preliminary results of a study to exploit the electrical properties of anisotropic nematic liquid crystal (LC) substrate in order to create a phase shifter which is suitable for beam scanning reflectarray antennas. A finite element computer model is used to establish the relationship between the LC thickness and the obtainable reflection phase range for a patch element, where the change in material permittivity can be obtained by applying a DC voltage between the patch and the ground plane. Waveguide simulator measurements are used to demonstrate the validity of the predictions.","PeriodicalId":312723,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2005","volume":"64 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114097797","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}
引用次数: 19
Effect of a measurement based error on the capacity of a 5/spl times/5 twisted-pair MIMO communications system 基于测量误差对5/ sp1倍/5双绞线MIMO通信系统容量的影响
High Frequency Postgraduate Student Colloquium, 2005 Pub Date : 2005-09-05 DOI: 10.1109/HFPSC.2005.1566376
P. Chambers, C. Downing, H. Baher
{"title":"Effect of a measurement based error on the capacity of a 5/spl times/5 twisted-pair MIMO communications system","authors":"P. Chambers, C. Downing, H. Baher","doi":"10.1109/HFPSC.2005.1566376","DOIUrl":"https://doi.org/10.1109/HFPSC.2005.1566376","url":null,"abstract":"The MIMO communications system model is presented with reference to actual transmission line measurements on a 5/spl times/5 twisted-pair telephone cable. It is thought that such a model could be useful in complementing a fibre optic backbone Internet system since twisted-pair connections to consumer premises are more economically viable then fibre optic ones. This paper shows that a successful implementation of a MIMO communications system for twisted-pair telephone cable is contingent on accurate measurement of the S-parameter, S/sub 21/, of the telephone cable.","PeriodicalId":312723,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2005","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130718321","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}
引用次数: 2
HFSS/spl trade/ modelling anomalies with electrically thin-walled metal-pipe rectangular waveguide simulations HFSS/spl贸易/模拟异常与电薄壁金属管矩形波导模拟
High Frequency Postgraduate Student Colloquium, 2005 Pub Date : 2005-09-05 DOI: 10.1109/HFPSC.2005.1566372
J.Y. Choi, S. Lucyszyn
{"title":"HFSS/spl trade/ modelling anomalies with electrically thin-walled metal-pipe rectangular waveguide simulations","authors":"J.Y. Choi, S. Lucyszyn","doi":"10.1109/HFPSC.2005.1566372","DOIUrl":"https://doi.org/10.1109/HFPSC.2005.1566372","url":null,"abstract":"The authors have found modelling anomalies with the simulation of electrically thin-walled metal-pipe rectangular waveguides (MPRWGs_~using Ansoft's commercial software package HFSS/spl trade/). This problem is evident depending on how the simulations are set up. A numbers of different modelling strategies were investigated, to examine the attenuation of a simple X-band copper-walled MPRWG at 10 GHz, With the normal copper-walled object drawn, but not using the 'solve inside' option, the simulations proved accurate to theoretical predictions for wall thicknesses greater than approximately /spl pi//spl delta/. When the 'solve inside' function is used, only simulations with a physical thickness at approximately /spl pi//spl delta/ were accurate, even if a radiation boundary was applied to the outer surface of the MPRWG. However, if a physically small air-gap of the order of millimetres is introduced between the outer surface of the MPRWG's walls and the radiation boundary, the simulations proved accurate to theoretical predictions for wall thicknesses less than approximately /spl pi//spl delta/. Finally, if the normal copper-walled object is replaced by a 'layered impedance boundary', having assigned theoretical wall thickness and bulk conductivity for copper, then it was found that the simulations accurately predict theory for all wall thicknesses. This discovery has profound implications for the accurate simulation of MPRWG structures and components.","PeriodicalId":312723,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2005","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122416742","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}
引用次数: 5
Towards a microstrip antenna on synthetic high-dielectric constant substrates 合成高介电常数基板微带天线的研究
High Frequency Postgraduate Student Colloquium, 2005 Pub Date : 2005-09-05 DOI: 10.1109/HFPSC.2005.1566362
T. Prodromakis, C. Papavassiliou
{"title":"Towards a microstrip antenna on synthetic high-dielectric constant substrates","authors":"T. Prodromakis, C. Papavassiliou","doi":"10.1109/HFPSC.2005.1566362","DOIUrl":"https://doi.org/10.1109/HFPSC.2005.1566362","url":null,"abstract":"This work is an investigation into the dielectric properties of multilayered substrates. We focus on slow-wave polarization modes, known to occur in some layered substrates. We envisage exploiting the high resonant dielectric constant to obtain increased directivity of patch antennas. Issues such as reduced electrical efficiency due to a greater number of back-lobes, directed into the substrate, are also discussed. Simulated results indicate that relative effective dielectric constants exceeding values of 100 are possible at relatively low loss tangents even with very conductive substrates. The main effect of substrate conductivity is the definition of a frequency band in which the enhanced directivity is observed. Furthermore, reflecting schemes are proposed to further enhance antenna efficiency.","PeriodicalId":312723,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2005","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117132392","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}
引用次数: 7
A novel rectangular waveguide supporting any cutoff frequency with arbitrary dimension 一种支持任意尺寸任意截止频率的新型矩形波导
High Frequency Postgraduate Student Colloquium, 2005 Pub Date : 2005-09-05 DOI: 10.1109/HFPSC.2005.1566371
W. Tong, Z.R. Hu
{"title":"A novel rectangular waveguide supporting any cutoff frequency with arbitrary dimension","authors":"W. Tong, Z.R. Hu","doi":"10.1109/HFPSC.2005.1566371","DOIUrl":"https://doi.org/10.1109/HFPSC.2005.1566371","url":null,"abstract":"Here we demonstrate a novel waveguide composed by a pair of parallel slabs made of a metamaterial with both negative real permittivity and permeability (double negative material, DNG), and a conventional material with both positive real permittivity and permeability (double positive material, DPS). Salient property of this guided mode is that it can support the wave propagation at any cutoff frequency with arbitrary dimension. The special parameters, such as the thickness of slabs made of DNG and DPS materials and wavenumber, are also presented in this paper.","PeriodicalId":312723,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2005","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114997853","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}
引用次数: 0
Surface plasmons in layered semiconductor-dielectric structures 层状半导体-介电结构中的表面等离子体
High Frequency Postgraduate Student Colloquium, 2005 Pub Date : 2005-09-05 DOI: 10.1109/HFPSC.2005.1566356
X. Yan, A. Schuchinsky, V. Fusco
{"title":"Surface plasmons in layered semiconductor-dielectric structures","authors":"X. Yan, A. Schuchinsky, V. Fusco","doi":"10.1109/HFPSC.2005.1566356","DOIUrl":"https://doi.org/10.1109/HFPSC.2005.1566356","url":null,"abstract":"Eigenwaves in a parallel plate waveguide loaded with a tangentially magnetised semiconductor layer sandwiched between two dissimilar dielectric layers are analysed. The dispersion equation (DE) is factorised in order to separate dynamic and plasmonic type waves. Then asymptotic solutions of the factorised DE are obtained in closed form for the plasmonic type eigenwaves and used as initial approximations for the numerical solution. The simulated dispersion characteristics, field and Poynting vector distributions show that the parameters of the dielectric layers surrounding the semiconductor layer may qualitatively alter the fundamental properties of the surface magnetoplasmons.","PeriodicalId":312723,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2005","volume":"53 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113957816","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}
引用次数: 1
Antenna effects in impulse radio communication systems 脉冲无线电通信系统中的天线效应
High Frequency Postgraduate Student Colloquium, 2005 Pub Date : 2005-09-05 DOI: 10.1109/HFPSC.2005.1566361
Y. Zhang
{"title":"Antenna effects in impulse radio communication systems","authors":"Y. Zhang","doi":"10.1109/HFPSC.2005.1566361","DOIUrl":"https://doi.org/10.1109/HFPSC.2005.1566361","url":null,"abstract":"A complete simulation of an ultra-wide band communication system in an indoor environment has been undertaken in the time domain. This utilizes time domain 3-D ray tracing coupled with antenna modeling to provide an overall channel simulation. The time-domain radiating characteristics of different linear antennas in transmission and reception in a typical indoor environment are used as representative of typical antennas. The UWB channel was studied with and without considering antenna effect and the system performance are evaluated accordingly. Broadly, link performance is affected by two different factors: radiation pattern from the antenna and impedance mismatch effects. Both are included in the simulation, results are based on 10 meters distance between the transmitter and receiver and 100 Mbps data transmission rate assumed in a complex indoor environment.","PeriodicalId":312723,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2005","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126653602","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}
引用次数: 2
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