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IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium最新文献

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Characterisation of lightwave networks 光波网络的特性
IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium Pub Date : 1996-09-13 DOI: 10.1109/HFPSC.1996.552455
B. Elamaran, R. Pollard, S. Iezekiel
{"title":"Characterisation of lightwave networks","authors":"B. Elamaran, R. Pollard, S. Iezekiel","doi":"10.1109/HFPSC.1996.552455","DOIUrl":"https://doi.org/10.1109/HFPSC.1996.552455","url":null,"abstract":"The increasing use of microwave fibre-optic links requires that efficient and accurate lightwave network analysers and techniques are developed. This paper follows from previous work done on a bilateral test set for lightwave networks. Theoretical simulations have been carried out which have demonstrated the viability of this approach for lightwave measurements. The advantage of the proposed network is that it can be used as a black box to convert a microwave network analyser into a lightwave network analyser.","PeriodicalId":359525,"journal":{"name":"IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130418947","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
Ideal absorption condition for FDTD method in isotropic lossy dispersive media 时域有限差分法在各向同性损耗色散介质中的理想吸收条件
IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium Pub Date : 1996-09-13 DOI: 10.1109/HFPSC.1996.552459
M. Cai, H. Zhou, N.N. Ljepojevic
{"title":"Ideal absorption condition for FDTD method in isotropic lossy dispersive media","authors":"M. Cai, H. Zhou, N.N. Ljepojevic","doi":"10.1109/HFPSC.1996.552459","DOIUrl":"https://doi.org/10.1109/HFPSC.1996.552459","url":null,"abstract":"The behaviour of the electromagnetic field in isotropic lossy media is described with the PML split field forms in a modified set of Maxwell's equations in stretched coordinates. The general expressions for propagation constants, impedance, reflection and transmission coefficients with original constitutive parameters in isotropic lossy media and stretched complex coefficients are derived. We call these general expressions the PMLS characteristics. Based on the PMLS, a set of equivalent constitutive parameters are provided to replace the original constitutive parameters in Cartesian coordinates. The equivalent constitutive parameters can be chosen as special values that are suitable for the calculation by FDTD method or other electromagnetic modelling methods. We prove that the difference between the fields calculated in the original constitutive parameters and in the equivalent constitutive parameters is a complex constant. This field equivalent aspect is called constitutive equivalent principle. For any values of the original constitutive parameters in isotropic lossy media, a set of stretched complex coefficients can be specified to provide equivalent constitutive parameters in which an absorption boundary condition is established for FDTD method. We call the absorption boundary condition the Ideal Absorption Condition (IAC). We prove that the Perfectly Matched Layers (PML) is a special case of the IAC when the electric conductivity and magnetic conductivity in the original constitutive parameters equal zero. For the verification of the IAC, the input admittance for a dipole antenna in a homogeneous lossy material calculated by FDTD method with IAC was compared by a Three-Term Exponential Product analytical solution.","PeriodicalId":359525,"journal":{"name":"IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133860272","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
Low loss phase shifter for dielectric waveguide 介质波导用低损耗移相器
IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium Pub Date : 1996-09-13 DOI: 10.1109/HFPSC.1996.552458
P. Young, R. Collier
{"title":"Low loss phase shifter for dielectric waveguide","authors":"P. Young, R. Collier","doi":"10.1109/HFPSC.1996.552458","DOIUrl":"https://doi.org/10.1109/HFPSC.1996.552458","url":null,"abstract":"This paper presents a design method for dielectric waveguide phase shifters. Phase shifting is achieved by varying the distance between a dielectric waveguide and an arbitrary piece of dielectric. Experimental results are given and are shown to be in good comparison with the theory. It is shown that phase shifters with very low loss can be realised if the dielectric is small in comparison to the waveguide. Furthermore, the losses are less than existing metallic wall phase shifters.","PeriodicalId":359525,"journal":{"name":"IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132178548","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
Analytical modelling of the heterojunction bipolar transistor based distributed amplifier 基于异质结双极晶体管的分布式放大器的解析建模
IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium Pub Date : 1996-09-13 DOI: 10.1109/HFPSC.1996.552452
A. Iqbal, I. Darwazeh
{"title":"Analytical modelling of the heterojunction bipolar transistor based distributed amplifier","authors":"A. Iqbal, I. Darwazeh","doi":"10.1109/HFPSC.1996.552452","DOIUrl":"https://doi.org/10.1109/HFPSC.1996.552452","url":null,"abstract":"In this paper we introduce a technique for modelling the distributed amplifier (DA) and in particular, the Heterojunction Bipolar Transistor (HBT) based DA. This modelling takes into account all feedback and parasitic elements associated with the HBT. Simulations of DAs based on our model and existing models are compared to those of the full DA. Results indicate that our model shows significant improvement over current models.","PeriodicalId":359525,"journal":{"name":"IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123096000","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
Feedback control of a linearised Mach-Zehnder modulator for SCM applications 用于单片机应用的线性马赫-曾德尔调制器的反馈控制
IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium Pub Date : 1996-09-13 DOI: 10.1109/HFPSC.1996.552456
R. B. Ellis, M. Capstick
{"title":"Feedback control of a linearised Mach-Zehnder modulator for SCM applications","authors":"R. B. Ellis, M. Capstick","doi":"10.1109/HFPSC.1996.552456","DOIUrl":"https://doi.org/10.1109/HFPSC.1996.552456","url":null,"abstract":"This paper introduces a practical feedback control technique which stabilises the third-order linearisation performance of a Mach Zehnder modulator. Predistortion linearisation is performed to reduce non-linear intermodulation distortion generated by a Mach Zehnder modulator. Results that show the lineariser performance are presented and a method is identified of how the system can be extended to control second-order distortion cancellation.","PeriodicalId":359525,"journal":{"name":"IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127543949","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: 4
Nonlinear transmission line (NLTL) design as a pulse generator 作为脉冲发生器的非线性传输线设计
IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium Pub Date : 1996-09-13 DOI: 10.1109/HFPSC.1996.552451
D. Salamh, D. Linton
{"title":"Nonlinear transmission line (NLTL) design as a pulse generator","authors":"D. Salamh, D. Linton","doi":"10.1109/HFPSC.1996.552451","DOIUrl":"https://doi.org/10.1109/HFPSC.1996.552451","url":null,"abstract":"Computer simulations are performed to optimize the number of sections in a tapered NLTL generating a pulse signal. The Schottky diode model is used based on physical simulation using Silvaco. The extracted CV characteristics are fitted to a hyperbolic function. The effect of the input frequency on the output pulse is investigated.","PeriodicalId":359525,"journal":{"name":"IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130515540","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
Retrodirective beam formation using switched amplifiers 使用开关放大器的反向定向波束形成
IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium Pub Date : 1996-09-13 DOI: 10.1109/HFPSC.1996.552463
S.L. Karode, V. Fusco
{"title":"Retrodirective beam formation using switched amplifiers","authors":"S.L. Karode, V. Fusco","doi":"10.1109/HFPSC.1996.552463","DOIUrl":"https://doi.org/10.1109/HFPSC.1996.552463","url":null,"abstract":"This paper presents experimental results for retrodirective beam formation using switched amplifiers. A two element retrodirective antenna array using this technique was built at 1 GHz, using microstrip patch antennas as array elements. Commercially available amplifiers and switches were used to make the amplifier switching circuitry. Initial results of the experiments conducted on this prototype are encouraging and are presented here.","PeriodicalId":359525,"journal":{"name":"IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128129988","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
All-optical microwave frequency filters 全光微波频率滤波器
IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium Pub Date : 1996-09-13 DOI: 10.1109/HFPSC.1996.552457
T. Cusick, S. Iezekiel, R. Miles
{"title":"All-optical microwave frequency filters","authors":"T. Cusick, S. Iezekiel, R. Miles","doi":"10.1109/HFPSC.1996.552457","DOIUrl":"https://doi.org/10.1109/HFPSC.1996.552457","url":null,"abstract":"This paper introduces the field of all-optical signal processing at microwave frequencies, in which optical fibre networks are used to realise signal processing functions. The fundamental principles are explained, and the components of these structures described. An analysis of basic film structures, which can be used as building blocks for more complicated structures, is included with supporting measurements. Finally a new algorithm for the synthesis of window responses using an all-passive network is explained and demonstrated.","PeriodicalId":359525,"journal":{"name":"IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126660442","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
Low field microwave power dependence as a function of temperature in Gd123 thin films Gd123薄膜中温度对低场微波功率的依赖性
IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium Pub Date : 1996-09-13 DOI: 10.1109/HFPSC.1996.552453
A. Cowie, L. Cohen, J. Gallop, L.N. Goncharov
{"title":"Low field microwave power dependence as a function of temperature in Gd123 thin films","authors":"A. Cowie, L. Cohen, J. Gallop, L.N. Goncharov","doi":"10.1109/HFPSC.1996.552453","DOIUrl":"https://doi.org/10.1109/HFPSC.1996.552453","url":null,"abstract":"Using a 5 GHz parallel plate resonator, several Gd123 thin films have been studied as a function of low microwave power and temperature. Two simple models which describe the power dependence of high temperature superconducting films are discussed. For this preliminary study, films were chosen whose microstructure appeared to be most suitable for modelling.","PeriodicalId":359525,"journal":{"name":"IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132103276","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
Two element active antenna array mode stability 双元有源天线阵列模式稳定性
IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium Pub Date : 1996-09-13 DOI: 10.1109/HFPSC.1996.552462
D. Humphrey, V. Fusco
{"title":"Two element active antenna array mode stability","authors":"D. Humphrey, V. Fusco","doi":"10.1109/HFPSC.1996.552462","DOIUrl":"https://doi.org/10.1109/HFPSC.1996.552462","url":null,"abstract":"It is known that when a passive antenna array is arranged to enable quasi-optical power-combining, a single phase distribution or mode will exist between the individual elements. However, when active antenna arrays are considered the individual active antenna oscillators can exhibit a number of array modes. In this paper, closed form analytical equations for the stability condition for the two modes available within a two element collinear array as the element separation is increased are presented. This information enables the correct prediction of the output characteristics of the array which is important since the far-field radiation pattern depends on the stable mode (i.e. boresight null or peak).","PeriodicalId":359525,"journal":{"name":"IEEE MTT/ED/AP/LEO Societies Joint Chapter. United Kingdom and Republic of Ireland Section. 1996 2nd High Frequency Postgraduate Student Colloquium","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122111722","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
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