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2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539)最新文献

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High frequency pulse generation using a gain-switched commercial semiconductor laser with strong external injection 使用增益开关商用半导体激光器与强外部注入产生高频脉冲
2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539) Pub Date : 2000-09-07 DOI: 10.1109/HFPSC.2000.874094
P. Anandarajah, A. Kaszubowska, L. Barry
{"title":"High frequency pulse generation using a gain-switched commercial semiconductor laser with strong external injection","authors":"P. Anandarajah, A. Kaszubowska, L. Barry","doi":"10.1109/HFPSC.2000.874094","DOIUrl":"https://doi.org/10.1109/HFPSC.2000.874094","url":null,"abstract":"We experimentally demonstrate how strong external-injection into a commercial semiconductor diode increases the laser bandwidth such that gain-switched pulses can be generated at frequencies up to 20 GHz (which is far in excess of the lasers inherent bandwidth). The optical pulses generated have pulse widths around 15 ps, and spectral widths of 35 GHz, giving a time-bandwidth product of 0.52, which is close to the transform limit for Gaussian pulses.","PeriodicalId":185234,"journal":{"name":"2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133895869","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
Beam steering using a single dipole antenna including a capacitive load 使用包含电容负载的单偶极子天线进行波束转向
2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539) Pub Date : 2000-09-07 DOI: 10.1109/HFPSC.2000.874075
H. Scott, V. Fusco
{"title":"Beam steering using a single dipole antenna including a capacitive load","authors":"H. Scott, V. Fusco","doi":"10.1109/HFPSC.2000.874075","DOIUrl":"https://doi.org/10.1109/HFPSC.2000.874075","url":null,"abstract":"This paper presents a single dipole antenna configured in such a way that with the inclusion of a variable capacitor it is possible to achieve beam steering using a single antenna. Presently electronic beam steering is only achievable using an array of antennas with a phase increment at each antenna, this method has an increased cost and physical size over a single loaded antenna. Method of moments code is used to find the optimum configuration of the loaded antenna to provide maximum beam steering. The simulated results and the benefits of using the single loaded dipole over a phased antenna array with regard to mobile communications are presented.","PeriodicalId":185234,"journal":{"name":"2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127027333","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
Simulation results for a novel optically controlled photonic bandgap structure for microstrip lines 一种新型光控光子带隙微带线结构的仿真结果
2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539) Pub Date : 2000-09-07 DOI: 10.1109/HFPSC.2000.874091
D. Cadman, D. Hayes, R. Miles, R. Kelsall
{"title":"Simulation results for a novel optically controlled photonic bandgap structure for microstrip lines","authors":"D. Cadman, D. Hayes, R. Miles, R. Kelsall","doi":"10.1109/HFPSC.2000.874091","DOIUrl":"https://doi.org/10.1109/HFPSC.2000.874091","url":null,"abstract":"A novel optically controlled one dimensional (1D) photonic bandgap (PBG) microstrip structure is proposed. This device consists of a 50 /spl Omega/ microstrip transmission line and a PBG ground plane both deposited onto a photoconductive substrate. With no optical illumination the structure exhibits a well-defined stopband. When light is focused through the holes in the ground plane and onto the substrate, electron-hole pairs are generated to form a photoinduced plasma. This increases the conductivity of the exposed region of the substrate and forms a complete ground plane. The structure then acts as a conventional microstrip line and the bandstop characteristics are switched off. S-parameter simulation results are presented.","PeriodicalId":185234,"journal":{"name":"2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114561581","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: 12
Practical aspects of manufacturing millimeter wave products in a "real world" environment 在“真实世界”环境中制造毫米波产品的实际方面
2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539) Pub Date : 2000-09-07 DOI: 10.1109/HFPSC.2000.874087
S. Aubrey
{"title":"Practical aspects of manufacturing millimeter wave products in a \"real world\" environment","authors":"S. Aubrey","doi":"10.1109/HFPSC.2000.874087","DOIUrl":"https://doi.org/10.1109/HFPSC.2000.874087","url":null,"abstract":"A range of millimeter wave components are presented and discussed. The components include transmission lines, a 36 GHz 3 dB coupler, Ku-band filter structures of LPF and BSF types up to 20 GHz, a discrete and MIMIC LNA design concept, and a Ka-band power amplifier (PA) for military purposes. The transmission lines perform very well to 40 GHz exhibiting low loss -1.741 dB (average) and respectable input reflection coefficient -19.89 (average). A millimeter wave coupling structure centre frequency of 36 GHz has been realised enabling power combining at Ka-band with low coupling loss achievable. The filters manufactured illustrate that good convergance between simulated and measured data can be achieved with linear simulators. LNA's in a concept discrete design (6 dB NF, 5 dB gain) and MIMIC (3.57 dB NF, 16.4 dB gain) environment are covered. With PA's frequently being the primary focus in a communication system, a Ka-band PA design (P/sub sat/ approaching +30 dBm) is considered.","PeriodicalId":185234,"journal":{"name":"2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130592357","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
A novel non-destructive method for assessing the thermal resistance of power GaAs RF-MMIC amplifiers 一种评估功率GaAs RF-MMIC放大器热阻的新型无损方法
2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539) Pub Date : 2000-09-07 DOI: 10.1109/HFPSC.2000.874076
R. Petersen, W. De Ceuninck, L. de Schepper
{"title":"A novel non-destructive method for assessing the thermal resistance of power GaAs RF-MMIC amplifiers","authors":"R. Petersen, W. De Ceuninck, L. de Schepper","doi":"10.1109/HFPSC.2000.874076","DOIUrl":"https://doi.org/10.1109/HFPSC.2000.874076","url":null,"abstract":"Thermal resistance measurements on MMIC amplifier modules are demonstrated where the present capacitive biasing network rendered the application of classical methods relying on the gate forward voltage characteristics not feasible. It has been found that employing the drain current as a temperature sensitive measurement parameter is much less sensitive to switching transients as only voltage sources are applied. Another important benefit of the drain current method is that untypical operating conditions and possible gate damage are avoided. The method has been applied to flight modules for satellite X-band amplifiers, where no modification of the final devices for measurement purposes could be tolerated.","PeriodicalId":185234,"journal":{"name":"2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115029321","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
Using Volterra mapping based behavioural models to evaluate ACI and cross modulation in CDMA communication systems 使用基于Volterra映射的行为模型来评估CDMA通信系统中的ACI和交叉调制
2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539) Pub Date : 2000-09-07 DOI: 10.1109/HFPSC.2000.874090
T. Wang, T. Brazil
{"title":"Using Volterra mapping based behavioural models to evaluate ACI and cross modulation in CDMA communication systems","authors":"T. Wang, T. Brazil","doi":"10.1109/HFPSC.2000.874090","DOIUrl":"https://doi.org/10.1109/HFPSC.2000.874090","url":null,"abstract":"This work describes the estimation of Volterra transfer functions up to fifth-order using passband CDMA excitation. We also present an analysis of the nonlinear performance of a power amplifier and its output power spectrum when excited by a CDMA signal, based on the Volterra descriptions. Finally, the method is validated by comparison between measured results and the predicted nonlinear transfer characteristics of an RF power amplifier. The techniques described are believed to be useful for component and system engineers designing power components while taking into consideration aspects such as adjacent channel interference.","PeriodicalId":185234,"journal":{"name":"2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114436300","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
Systematic evaluation of PHEMT large signal characteristics using time domain measurements 利用时域测量系统评价PHEMT大信号特性
2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539) Pub Date : 2000-09-07 DOI: 10.1109/HFPSC.2000.874088
D. G. Morgan, P. Tasker, G. Edwards, A. Phillips
{"title":"Systematic evaluation of PHEMT large signal characteristics using time domain measurements","authors":"D. G. Morgan, P. Tasker, G. Edwards, A. Phillips","doi":"10.1109/HFPSC.2000.874088","DOIUrl":"https://doi.org/10.1109/HFPSC.2000.874088","url":null,"abstract":"The complete Pseudomorphic High Electron Mobility Transistor (PHEMT) gate and drain RF I-V contours are systematically and accurately characterised for use in table based or table-equation based nonlinear CAD (Computer Aided Design) models. Waveform measurements are achieved using a fully vector error corrected, time domain nonlinear vector network analyser system, based on the HP-MTA (Microwave Transition Analyser). The technique is established around a simple mathematically proven harmonic compression concept. A fixed harmonic condition is set-up and maintained throughout the drain scan duration, such that the observed dynamic loadline saturates to the given condition symmetrically about the DC quiescent point. Measurement analysis yields numerical and also first order observational information about the Imax/sub RF/ and Imin/sub RF/ boundaries yielding directly effects such as soft breakdown, knee voltage, thermal roll off, and RF to DC related issues. Ensuing work indicates the extraction of totally dynamic RF I-V and RF Q-V contours, directly from large signal measurements.","PeriodicalId":185234,"journal":{"name":"2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121991457","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
Optically fed microwave system using laser diodes with enhanced modulation bandwidth 采用增强调制带宽的激光二极管的光馈微波系统
2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539) Pub Date : 2000-09-07 DOI: 10.1109/HFPSC.2000.874083
A. Kaszubowska, P. Anandarajah, L. Barry
{"title":"Optically fed microwave system using laser diodes with enhanced modulation bandwidth","authors":"A. Kaszubowska, P. Anandarajah, L. Barry","doi":"10.1109/HFPSC.2000.874083","DOIUrl":"https://doi.org/10.1109/HFPSC.2000.874083","url":null,"abstract":"The authors present the idea of using a laser diode with enhanced modulation characteristics to generate microwave optical signals for radio-over-fibre systems. By employing strong external light injection into a laser diode, the bandwidth improvement is shown experimentally, and by using a simulation package, we then demonstrate how the bandwidth improvement greatly enhances the overall performance of an optically fed microwave system based on direct modulation of a laser diode.","PeriodicalId":185234,"journal":{"name":"2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539)","volume":"319 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121470931","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: 3
The influence of via hole inductance on millimetre-wave mixer performance 通孔电感对毫米波混频器性能的影响
2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539) Pub Date : 2000-09-07 DOI: 10.1109/HFPSC.2000.874080
T. Brabetz, V. Fusco
{"title":"The influence of via hole inductance on millimetre-wave mixer performance","authors":"T. Brabetz, V. Fusco","doi":"10.1109/HFPSC.2000.874080","DOIUrl":"https://doi.org/10.1109/HFPSC.2000.874080","url":null,"abstract":"A novel method to eliminate the negative influence of the parasitic inductance of via holes on mixer performance is presented. The via hole inductance is resonated with an open stub for the millimetre-wave frequencies of the circuit. Detailed simulations of a pHEMT GaAs MMIC gate mixer predict a 2 dB higher conversion gain, and 4 dB reduction in LO power requirements for a circuit with resonated via holes in comparison to one with the classic form of via holes.","PeriodicalId":185234,"journal":{"name":"2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124133931","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
Novel neural network-Bessel transform for behavioural modelling of a power amplifier 基于神经网络贝塞尔变换的功率放大器行为建模
2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539) Pub Date : 1900-01-01 DOI: 10.1109/HFPSC.2000.874081
J. O'Toole, T. Brazil
{"title":"Novel neural network-Bessel transform for behavioural modelling of a power amplifier","authors":"J. O'Toole, T. Brazil","doi":"10.1109/HFPSC.2000.874081","DOIUrl":"https://doi.org/10.1109/HFPSC.2000.874081","url":null,"abstract":"A novel neural network based behavioural model is presented, which aims to decrease simulation time and increase the accuracy of existing models. The neural network model is an alternative to existing behavioural models, using a new neural network-Bessel transform to obtain the behavioural transfer function of the Power Amplifier (PA). The neural network then maps the transfer characteristics of the PA, based on the amplitude modulation-amplitude modulation (AM-AM), amplitude modulation-phase modulation (AM-PM) functions. The model is used to evaluate adjacent channel power for a Wideband CDMA (W-CDMA) signal.","PeriodicalId":185234,"journal":{"name":"2000 High Frequency Postgraduate Student Colloquium (Cat. No.00TH8539)","volume":"230 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130985405","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
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