Pub Date : 1983-09-01DOI: 10.1109/EUMA.1983.333260
T. Ege
Two different methods for the analysis of the wave propagation along a TEM-line periodically series loaded with lumped capacitors is presented. The first method is based upon transmission line theory and a perturbation technique to estimate the complex propagation constant of the waves traveling along the structure. As an alternative approach, an exact analysis based on the principle of reaction is employed to compute the current distribution along the structure from which the propagation constant of the waves is determined. Numerical results for the complex propagation constant from the two methods are compared. For the parameter variations studied, the perturbation approach is found to agree well with those due to the moment method solution.
{"title":"Determination of the Propagation Constant of the Waves Traveling Along a TEM-line Periodically Series Loaded with Lumped Capacitors","authors":"T. Ege","doi":"10.1109/EUMA.1983.333260","DOIUrl":"https://doi.org/10.1109/EUMA.1983.333260","url":null,"abstract":"Two different methods for the analysis of the wave propagation along a TEM-line periodically series loaded with lumped capacitors is presented. The first method is based upon transmission line theory and a perturbation technique to estimate the complex propagation constant of the waves traveling along the structure. As an alternative approach, an exact analysis based on the principle of reaction is employed to compute the current distribution along the structure from which the propagation constant of the waves is determined. Numerical results for the complex propagation constant from the two methods are compared. For the parameter variations studied, the perturbation approach is found to agree well with those due to the moment method solution.","PeriodicalId":105436,"journal":{"name":"1983 13th European Microwave Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124034578","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 : 1983-09-01DOI: 10.1109/EUMA.1983.333275
H. Aebischer, C. Maetzler
In microwave remote sensing of snow as well as in snowand avalanche research, it is essential to be able to measure the liquid water content of the snow [11] , 2). So far, snow hydrologists often used the "snow ball test" to get a quick but rather rough distinction between dry, humid and very wet snow. If they wanted to measure the snow wetness more accurately, they were forced to use time-consuming calorimetric methods. They are rather applicable in the laboratory. Another deficiency of such methods is that they imply the destruction of the snow sample to be measured.
{"title":"A Microwave Sensor for the Measurement of the Liquid Water Content on the Surface of the Snow Cover","authors":"H. Aebischer, C. Maetzler","doi":"10.1109/EUMA.1983.333275","DOIUrl":"https://doi.org/10.1109/EUMA.1983.333275","url":null,"abstract":"In microwave remote sensing of snow as well as in snowand avalanche research, it is essential to be able to measure the liquid water content of the snow [11] , 2). So far, snow hydrologists often used the \"snow ball test\" to get a quick but rather rough distinction between dry, humid and very wet snow. If they wanted to measure the snow wetness more accurately, they were forced to use time-consuming calorimetric methods. They are rather applicable in the laboratory. Another deficiency of such methods is that they imply the destruction of the snow sample to be measured.","PeriodicalId":105436,"journal":{"name":"1983 13th European Microwave Conference","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132362945","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 : 1983-09-01DOI: 10.1109/EUMA.1983.333293
G. Tie, C. Aitchison
The noise figure of a microwave MESFET mixer has been calculated for the first time. This paper presents the theoretical and experimental results of the noise figure and conversion gain of a microwave MESFET mixer. The effects of the RF circuit at the mixer's output side and the IF circuit at its input side upon its noise and gain performance are also presented.
{"title":"Noise Figure and Associated Conversion Gain of a Microwave MESFET Gate Mixer","authors":"G. Tie, C. Aitchison","doi":"10.1109/EUMA.1983.333293","DOIUrl":"https://doi.org/10.1109/EUMA.1983.333293","url":null,"abstract":"The noise figure of a microwave MESFET mixer has been calculated for the first time. This paper presents the theoretical and experimental results of the noise figure and conversion gain of a microwave MESFET mixer. The effects of the RF circuit at the mixer's output side and the IF circuit at its input side upon its noise and gain performance are also presented.","PeriodicalId":105436,"journal":{"name":"1983 13th European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130129634","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 : 1983-09-01DOI: 10.1109/EUMA.1983.333255
J. Chilo, G. Angénieux, C. Monllor
The proximity and coupling effects between interconnection lines in V.S.L.I. circuits are studied by evaluating the power in the circuit. The coupling and propagation matrices and the exact current distribution in the conductors are established. The results of computation show that the losses and the dispersions in the lines are increased by proximity effects.
{"title":"Proximity Effects of Interconnection Lines in High Speed Integrated Logic Circuits","authors":"J. Chilo, G. Angénieux, C. Monllor","doi":"10.1109/EUMA.1983.333255","DOIUrl":"https://doi.org/10.1109/EUMA.1983.333255","url":null,"abstract":"The proximity and coupling effects between interconnection lines in V.S.L.I. circuits are studied by evaluating the power in the circuit. The coupling and propagation matrices and the exact current distribution in the conductors are established. The results of computation show that the losses and the dispersions in the lines are increased by proximity effects.","PeriodicalId":105436,"journal":{"name":"1983 13th European Microwave Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134017555","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 : 1983-09-01DOI: 10.1109/EUMA.1983.333296
Wolfgang Noack
The paper deals with path and network design, considering the effects of multipath fading. A multipath propagation model is used, based on measurements of a 59 km path near Munich and on results reported in the literature. The impact of a simulated 2-and 3-path fading on the residual inband amplitude and delay dispersion of a 16 QAM 140 Mbit/s system has been studied including various methods of improvement and their optimum combination.
{"title":"Planning Considerations for High Capacity Digital Radio Relay Networks","authors":"Wolfgang Noack","doi":"10.1109/EUMA.1983.333296","DOIUrl":"https://doi.org/10.1109/EUMA.1983.333296","url":null,"abstract":"The paper deals with path and network design, considering the effects of multipath fading. A multipath propagation model is used, based on measurements of a 59 km path near Munich and on results reported in the literature. The impact of a simulated 2-and 3-path fading on the residual inband amplitude and delay dispersion of a 16 QAM 140 Mbit/s system has been studied including various methods of improvement and their optimum combination.","PeriodicalId":105436,"journal":{"name":"1983 13th European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129566670","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 : 1983-09-01DOI: 10.1109/EUMA.1983.333273
N. Keen, E. Perchtold, R. Engelhardt
Due to the excellent performance of the 100 meter radiotelescope at 43 GHz using an uncooled mixer receiver [1], a cooled mixer receiver was constructed for the 40-50 GHz range. The total single-sideband system noise temperature is 250 K. The estimated mixer noise temperature is 160 K using a Mott diode. Technical and sample astronomical measurements are presented.
{"title":"The 40-50 GHz Cooled Mixer Receiver for The 100-Meter Effelsberg Radiotelescope","authors":"N. Keen, E. Perchtold, R. Engelhardt","doi":"10.1109/EUMA.1983.333273","DOIUrl":"https://doi.org/10.1109/EUMA.1983.333273","url":null,"abstract":"Due to the excellent performance of the 100 meter radiotelescope at 43 GHz using an uncooled mixer receiver [1], a cooled mixer receiver was constructed for the 40-50 GHz range. The total single-sideband system noise temperature is 250 K. The estimated mixer noise temperature is 160 K using a Mott diode. Technical and sample astronomical measurements are presented.","PeriodicalId":105436,"journal":{"name":"1983 13th European Microwave Conference","volume":"354 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115930822","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 : 1983-09-01DOI: 10.1109/EUMA.1983.333305
J. Nossek, H. Barth
A 16 QAM-modem for 140 Mb/s radio systems is described, with which a spectral efficiency of 3.5 bit/s/Hz is achieved. In the digital signal processing parts extensive use is made of ECL gate arrays. Spectrum shaping according to Nyquist's criterion is performed in the IF with the aid of SAW-bandpass filters (¿ = 0.5). Experimental results obtained with this modem are reported. The incorporation of an adaptive baseband equalizer employing a complex transversal filter is discussed.
{"title":"Design and Realization of a 16 QAM-Modem for a 140 Mb/s Digital Radio System Family","authors":"J. Nossek, H. Barth","doi":"10.1109/EUMA.1983.333305","DOIUrl":"https://doi.org/10.1109/EUMA.1983.333305","url":null,"abstract":"A 16 QAM-modem for 140 Mb/s radio systems is described, with which a spectral efficiency of 3.5 bit/s/Hz is achieved. In the digital signal processing parts extensive use is made of ECL gate arrays. Spectrum shaping according to Nyquist's criterion is performed in the IF with the aid of SAW-bandpass filters (¿ = 0.5). Experimental results obtained with this modem are reported. The incorporation of an adaptive baseband equalizer employing a complex transversal filter is discussed.","PeriodicalId":105436,"journal":{"name":"1983 13th European Microwave Conference","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116255455","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 : 1983-09-01DOI: 10.1109/EUMA.1983.333231
A. Martí
A low cost high sensibility preamplifier unit built on a ridge-waveguide is proposed, explaining the characterization procedure for the minimun noise matching network, and giving the final results.
{"title":"Ridge-Guide Preamplifier for DBS Outdoor Unit","authors":"A. Martí","doi":"10.1109/EUMA.1983.333231","DOIUrl":"https://doi.org/10.1109/EUMA.1983.333231","url":null,"abstract":"A low cost high sensibility preamplifier unit built on a ridge-waveguide is proposed, explaining the characterization procedure for the minimun noise matching network, and giving the final results.","PeriodicalId":105436,"journal":{"name":"1983 13th European Microwave Conference","volume":"206 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115012556","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 : 1983-09-01DOI: 10.1109/EUMA.1983.333244
A. Jacob, C. Ansorge
The design and realization of stable fin-line FET-oscillators is described. Several examples of fundamental mode oscillators through X-band and Ku-band are given. A Ka-band second harmonic FET-oscillator is reported.
{"title":"Stabilized Fin-Line FET-Oscillators","authors":"A. Jacob, C. Ansorge","doi":"10.1109/EUMA.1983.333244","DOIUrl":"https://doi.org/10.1109/EUMA.1983.333244","url":null,"abstract":"The design and realization of stable fin-line FET-oscillators is described. Several examples of fundamental mode oscillators through X-band and Ku-band are given. A Ka-band second harmonic FET-oscillator is reported.","PeriodicalId":105436,"journal":{"name":"1983 13th European Microwave Conference","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125903651","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 : 1983-09-01DOI: 10.1109/EUMA.1983.333303
N. Sridhar, G. Srivastava
Overmoded corrugated guide feedst used for high efficiency illumination of reflector antennas, suffer from an inherently restricted bandwidth of operation because of the dispersion in phase velocities of the modes. Experimental results, obtained with a 2-hybrid-mode feed, show that the dispersion can be compensated for by the frequency dependent mode generation characteristics of the input mode transducer and extremely large bandwidths of operation can be realised.
{"title":"Large Bandwidth Realisation in Dual Mode Corrugated Guide Feeds","authors":"N. Sridhar, G. Srivastava","doi":"10.1109/EUMA.1983.333303","DOIUrl":"https://doi.org/10.1109/EUMA.1983.333303","url":null,"abstract":"Overmoded corrugated guide feedst used for high efficiency illumination of reflector antennas, suffer from an inherently restricted bandwidth of operation because of the dispersion in phase velocities of the modes. Experimental results, obtained with a 2-hybrid-mode feed, show that the dispersion can be compensated for by the frequency dependent mode generation characteristics of the input mode transducer and extremely large bandwidths of operation can be realised.","PeriodicalId":105436,"journal":{"name":"1983 13th European Microwave Conference","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1983-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125369803","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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