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.1983.333215
J. Collins
Over the past 30 years microwave technology has matured and grown with ever increasing civil and military systems applications and the industry is now enjoying for the first time an important status with the investment community. The 1980's will witness massive research and development funding in the microwave technology required to be deployed in major new operational systems of the late 1980's and 1990's, including large communication satellites, direct broadcast satellites, Navstar global positioning systems, phased-array and airborne multimode radars, electronic warfare and remote sensing systems. By the 1990's sophisticated computer-aided design and computer-aided manufacturing techniques will be employed by the microwave industry and operational frequencies to 200 GHz will be commonplace. Thereby, microwaves will move from its current batch production techniques to the mass production techniques now commonplace in the semiconductor industry and, in turn, this will require optimum use of the scarce skilled manpower resource.
{"title":"Microwaves in the 1990's","authors":"J. Collins","doi":"10.1109/EUMA.1983.333215","DOIUrl":"https://doi.org/10.1109/EUMA.1983.333215","url":null,"abstract":"Over the past 30 years microwave technology has matured and grown with ever increasing civil and military systems applications and the industry is now enjoying for the first time an important status with the investment community. The 1980's will witness massive research and development funding in the microwave technology required to be deployed in major new operational systems of the late 1980's and 1990's, including large communication satellites, direct broadcast satellites, Navstar global positioning systems, phased-array and airborne multimode radars, electronic warfare and remote sensing systems. By the 1990's sophisticated computer-aided design and computer-aided manufacturing techniques will be employed by the microwave industry and operational frequencies to 200 GHz will be commonplace. Thereby, microwaves will move from its current batch production techniques to the mass production techniques now commonplace in the semiconductor industry and, in turn, this will require optimum use of the scarce skilled manpower resource.","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":"128646810","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.1983.333282
A. Jacob, K. Schunemann
The optimum circuit topology of cavity stabilized FET oscillators is found out from comparing various circuit configurations. Output power, loaded Q-factor, stable tuning range, FM-noise and power dissipated in stabili- zing resistors are related by both a large-signal and a noise analysis.
{"title":"Optimum Design of Cavity Stabilized FET Oscillators","authors":"A. Jacob, K. Schunemann","doi":"10.1109/EUMA.1983.333282","DOIUrl":"https://doi.org/10.1109/EUMA.1983.333282","url":null,"abstract":"The optimum circuit topology of cavity stabilized FET oscillators is found out from comparing various circuit configurations. Output power, loaded Q-factor, stable tuning range, FM-noise and power dissipated in stabili- zing resistors are related by both a large-signal and a noise analysis.","PeriodicalId":105436,"journal":{"name":"1983 13th European Microwave Conference","volume":"14 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":"123313788","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}
Pub Date : 1983-09-01DOI: 10.1109/EUMA.1983.333250
M. Malkomes, H. Schmitt, G. Kadisch, M. Poel
Results a of computer aided analysis of symmetrical 5-port micros trip-ring components with "de Ronde"-type inner coupling are presented. Optimized coupler designs employing internal and external matching technique show over one octave bandwidth, power balance within ldb and matching better than ¿20 dB. Design criteria for 5-port couplers are presented and the influences of the various coupler parameters are discussed in regard to high precision 6-port measurement applications.
{"title":"Broadband Multiport-Coupler","authors":"M. Malkomes, H. Schmitt, G. Kadisch, M. Poel","doi":"10.1109/EUMA.1983.333250","DOIUrl":"https://doi.org/10.1109/EUMA.1983.333250","url":null,"abstract":"Results a of computer aided analysis of symmetrical 5-port micros trip-ring components with \"de Ronde\"-type inner coupling are presented. Optimized coupler designs employing internal and external matching technique show over one octave bandwidth, power balance within ldb and matching better than ¿20 dB. Design criteria for 5-port couplers are presented and the influences of the various coupler parameters are discussed in regard to high precision 6-port measurement applications.","PeriodicalId":105436,"journal":{"name":"1983 13th European Microwave Conference","volume":"3 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":"122658352","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}
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