Pub Date : 2004-11-30DOI: 10.1109/HFPSC.2004.1360380
T. Urbanec, J. Licik
This paper presents a simple approach to design a six-port measurement system with all the necessary calibration. The attainable bandwidth is around one decade only, but primarily the use of the design is for the creation and evaluation of the acquisition and computing units of the measurement system.
{"title":"Practical implementation of the six-port measurement system","authors":"T. Urbanec, J. Licik","doi":"10.1109/HFPSC.2004.1360380","DOIUrl":"https://doi.org/10.1109/HFPSC.2004.1360380","url":null,"abstract":"This paper presents a simple approach to design a six-port measurement system with all the necessary calibration. The attainable bandwidth is around one decade only, but primarily the use of the design is for the creation and evaluation of the acquisition and computing units of the measurement system.","PeriodicalId":405718,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2004","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116047886","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}
Pub Date : 2004-11-30DOI: 10.1109/HFPSC.2004.1360376
Z. Aboush, J. Benedikt, P. Tasker
This paper presents a novel solution for the load-pull measurement of highly mismatched power transistors by means of using a broadband impedance transformer. This technique enables the power requirements of active load-pull systems necessary to synthesize load impedances at the device reference plane to be reduced significantly compared to the mismatched system.
{"title":"High power harmonic active load-pull using broadband impedance transformers [power transistor measurement]","authors":"Z. Aboush, J. Benedikt, P. Tasker","doi":"10.1109/HFPSC.2004.1360376","DOIUrl":"https://doi.org/10.1109/HFPSC.2004.1360376","url":null,"abstract":"This paper presents a novel solution for the load-pull measurement of highly mismatched power transistors by means of using a broadband impedance transformer. This technique enables the power requirements of active load-pull systems necessary to synthesize load impedances at the device reference plane to be reduced significantly compared to the mismatched system.","PeriodicalId":405718,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2004","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114431185","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}
Pub Date : 2004-11-30DOI: 10.1109/HFPSC.2004.1360354
L. Závodny, S. Hanus
This contribution deals with cellular radio network optimization. It is based on the realized experiment, focused on optimizing the GSM900 network. The bounded area in a rural region with smooth terrain is considered. A dual-slope, two-ray model is used for the radio signal propagation modelling. The assigning of radio channels to base stations and their emitted radio power are optimized. The main contribution of the work lies in detailed analysis of the criterion of optimization. An interesting solution was created by a study of interference analysis and reduction for wireless systems, usable network capacity, and of its overload capacity. The method of genetic algorithms is used for solving this problem. The experiment was carried out in a Matlab environment.
{"title":"Cellular radio network optimization based on the C/I ratio and transmission capacity","authors":"L. Závodny, S. Hanus","doi":"10.1109/HFPSC.2004.1360354","DOIUrl":"https://doi.org/10.1109/HFPSC.2004.1360354","url":null,"abstract":"This contribution deals with cellular radio network optimization. It is based on the realized experiment, focused on optimizing the GSM900 network. The bounded area in a rural region with smooth terrain is considered. A dual-slope, two-ray model is used for the radio signal propagation modelling. The assigning of radio channels to base stations and their emitted radio power are optimized. The main contribution of the work lies in detailed analysis of the criterion of optimization. An interesting solution was created by a study of interference analysis and reduction for wireless systems, usable network capacity, and of its overload capacity. The method of genetic algorithms is used for solving this problem. The experiment was carried out in a Matlab environment.","PeriodicalId":405718,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2004","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114590456","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}
Pub Date : 2004-11-30DOI: 10.1109/HFPSC.2004.1360372
J. Dřinovský, M. Motl
This paper explains conditions which can be used for measuring the insertion loss of electromagnetic interference filters. The main purpose is to design conditions which are similar to the supply network, and under these conditions realize the measurement of the filter insertion loss.
{"title":"Specific conditions for EMI filters measuring","authors":"J. Dřinovský, M. Motl","doi":"10.1109/HFPSC.2004.1360372","DOIUrl":"https://doi.org/10.1109/HFPSC.2004.1360372","url":null,"abstract":"This paper explains conditions which can be used for measuring the insertion loss of electromagnetic interference filters. The main purpose is to design conditions which are similar to the supply network, and under these conditions realize the measurement of the filter insertion loss.","PeriodicalId":405718,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2004","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130344887","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}
Pub Date : 2004-11-30DOI: 10.1109/HFPSC.2004.1360335
M. Abdullah, R. Green, M. Leeson
Infrared wireless communication possesses two main attractive advantages over its radio frequency counterpart, namely the abundance of unregulated spectrum in the 700 nm 1500 nm region and the ease with which the IR radiation can be confined. Integrating microwave electronics and optics, it is possible to provide wideband communication services but it is well known that the signal level in an optical wireless receiver is weakest at the front end. Therefore, this paper identifies the technical obstacles and limitations in indoor infrared optical wireless front-ends, in addition to techniques for mitigating these effects, showing that infrared is a viable alternative to radio for certain applications.
{"title":"Optical wireless communication front-ends","authors":"M. Abdullah, R. Green, M. Leeson","doi":"10.1109/HFPSC.2004.1360335","DOIUrl":"https://doi.org/10.1109/HFPSC.2004.1360335","url":null,"abstract":"Infrared wireless communication possesses two main attractive advantages over its radio frequency counterpart, namely the abundance of unregulated spectrum in the 700 nm 1500 nm region and the ease with which the IR radiation can be confined. Integrating microwave electronics and optics, it is possible to provide wideband communication services but it is well known that the signal level in an optical wireless receiver is weakest at the front end. Therefore, this paper identifies the technical obstacles and limitations in indoor infrared optical wireless front-ends, in addition to techniques for mitigating these effects, showing that infrared is a viable alternative to radio for certain applications.","PeriodicalId":405718,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2004","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130869459","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}
Pub Date : 2004-11-30DOI: 10.1109/HFPSC.2004.1360384
A. Khan, C. N. Dharmasiri, A. Rezazadeh
The two-tone intermodulation distortion (IMD) characteristic behaviour of microwave InGaP/GaAs double heterojunction bipolar transistors (DHBTs) is studied. This is carried out through measurement, with the results being compared to a simple analytical technique. Both mid frequency (50 MHz) and high frequency (2 GHz) ranges are characterised and the results compared. In addition, the effect of varying input bias levels on the non-linearities has been studied.
{"title":"Intermodulation distortion characterisation and analysis of the InGaP/GaAs DHBT","authors":"A. Khan, C. N. Dharmasiri, A. Rezazadeh","doi":"10.1109/HFPSC.2004.1360384","DOIUrl":"https://doi.org/10.1109/HFPSC.2004.1360384","url":null,"abstract":"The two-tone intermodulation distortion (IMD) characteristic behaviour of microwave InGaP/GaAs double heterojunction bipolar transistors (DHBTs) is studied. This is carried out through measurement, with the results being compared to a simple analytical technique. Both mid frequency (50 MHz) and high frequency (2 GHz) ranges are characterised and the results compared. In addition, the effect of varying input bias levels on the non-linearities has been studied.","PeriodicalId":405718,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2004","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123989847","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}
Pub Date : 2004-11-30DOI: 10.1109/HFPSC.2004.1360371
A. Farrall, P. Young
This paper investigates forming rectangular waveguides using printed circuit boards, which would potentially offer an extremely cheap and reliable means of providing a low loss transmission line for high frequency systems. A waveguide was synthesised, using metallized vias to form the edge of the waveguide - these designs are sometimes termed SIRWs (substrate integrated rectangular waveguides).
{"title":"Substrate integrated rectangular waveguides","authors":"A. Farrall, P. Young","doi":"10.1109/HFPSC.2004.1360371","DOIUrl":"https://doi.org/10.1109/HFPSC.2004.1360371","url":null,"abstract":"This paper investigates forming rectangular waveguides using printed circuit boards, which would potentially offer an extremely cheap and reliable means of providing a low loss transmission line for high frequency systems. A waveguide was synthesised, using metallized vias to form the edge of the waveguide - these designs are sometimes termed SIRWs (substrate integrated rectangular waveguides).","PeriodicalId":405718,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2004","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128837163","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}
Pub Date : 2004-11-30DOI: 10.1109/HFPSC.2004.1360336
D. Cronin, A. M. Moloney, A. Morrison
Simulations of a Geiger-mode avalanche photodiode (GMAP) monolithically integrated with its corresponding active quench and reset circuit (AQRC) are presented. The AQRC design is simulated in Agilent's ADS simulator using BSIM3 MOSFET models acquired from Europractice's 0.6 /spl mu/m CMOS process. The novelty of the design ensures a minimum dead-time of 13 ns between adjacent incident photons. This corresponds to a maximum achievable saturated count-rate of 77 Mcounts/sec, not previously reported.
{"title":"Simulated monolithically integrated single photon counter","authors":"D. Cronin, A. M. Moloney, A. Morrison","doi":"10.1109/HFPSC.2004.1360336","DOIUrl":"https://doi.org/10.1109/HFPSC.2004.1360336","url":null,"abstract":"Simulations of a Geiger-mode avalanche photodiode (GMAP) monolithically integrated with its corresponding active quench and reset circuit (AQRC) are presented. The AQRC design is simulated in Agilent's ADS simulator using BSIM3 MOSFET models acquired from Europractice's 0.6 /spl mu/m CMOS process. The novelty of the design ensures a minimum dead-time of 13 ns between adjacent incident photons. This corresponds to a maximum achievable saturated count-rate of 77 Mcounts/sec, not previously reported.","PeriodicalId":405718,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2004","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121306013","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}
Pub Date : 2004-11-30DOI: 10.1109/HFPSC.2004.1360344
D. Wylie, S. Rea, D. Linton
A planar resonant slot antenna with a ground plane aperture was developed for nondestructive testing of planar dielectric materials. Using an existing design methodology, a circuit was developed where the complex permittivity could be determined from the shift of the resonant frequency and knowledge of the thickness of the test substrate. The device was simulated using the method of moments and these simulations validated experimentally. The electric field around the aperture has also been investigated by simulation and measurement. It was found that the substrate manufacturers' values for the permittivity and tan /spl delta/ and the values as determined using this work are in agreement. In addition, the permittivity of carbon fibre composite (CFC) and nanoclay polymer substrates has also been investigated using this method.
{"title":"Non-destructive testing of complex permittivity using a slot antenna","authors":"D. Wylie, S. Rea, D. Linton","doi":"10.1109/HFPSC.2004.1360344","DOIUrl":"https://doi.org/10.1109/HFPSC.2004.1360344","url":null,"abstract":"A planar resonant slot antenna with a ground plane aperture was developed for nondestructive testing of planar dielectric materials. Using an existing design methodology, a circuit was developed where the complex permittivity could be determined from the shift of the resonant frequency and knowledge of the thickness of the test substrate. The device was simulated using the method of moments and these simulations validated experimentally. The electric field around the aperture has also been investigated by simulation and measurement. It was found that the substrate manufacturers' values for the permittivity and tan /spl delta/ and the values as determined using this work are in agreement. In addition, the permittivity of carbon fibre composite (CFC) and nanoclay polymer substrates has also been investigated using this method.","PeriodicalId":405718,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2004","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122614973","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}
Pub Date : 2004-11-30DOI: 10.1109/HFPSC.2004.1360353
S. Lee, A. Sambell, E. Korolkiewicz, S. Ooi, Y. Qin
This paper presents the design of a circular polarized nearly square patch antenna using an offset microstrip feed. By using an offset feed instead of the normal corner feed, it is shown that the area of the perturbation segment must increase in order to maintain circular polarization. Consequently, the effect of manufacturing errors on the axial ratio is reduced. Using a fixed offset feed position, the dimensions of the antenna are uniquely obtained. The antenna is matched using a simple matching network consisting of a short length of microstrip line. A matched antenna was designed to operate at 2.45 GHz, and an axial ratio of <0.5 dB with a return loss of >20 dB was obtained experimentally. The predicted, simulated and practical results are shown to be in good agreement.
{"title":"Design of a circular polarized nearly square microstrip patch antenna with offset feed","authors":"S. Lee, A. Sambell, E. Korolkiewicz, S. Ooi, Y. Qin","doi":"10.1109/HFPSC.2004.1360353","DOIUrl":"https://doi.org/10.1109/HFPSC.2004.1360353","url":null,"abstract":"This paper presents the design of a circular polarized nearly square patch antenna using an offset microstrip feed. By using an offset feed instead of the normal corner feed, it is shown that the area of the perturbation segment must increase in order to maintain circular polarization. Consequently, the effect of manufacturing errors on the axial ratio is reduced. Using a fixed offset feed position, the dimensions of the antenna are uniquely obtained. The antenna is matched using a simple matching network consisting of a short length of microstrip line. A matched antenna was designed to operate at 2.45 GHz, and an axial ratio of <0.5 dB with a return loss of >20 dB was obtained experimentally. The predicted, simulated and practical results are shown to be in good agreement.","PeriodicalId":405718,"journal":{"name":"High Frequency Postgraduate Student Colloquium, 2004","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134188511","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}
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