Pub Date : 1978-10-01DOI: 10.1109/EUMA.1978.332572
F. Assal, A. Berman, C. Mahle
This paper presents a temperature compensation technique for microwave integrated circuit (MIC) filters that may be employed in the implementation of onboard satellite DQPSK regenerators. These regenerators require extremely stable phase references for demodulation and bit-timing recovery. It has been found that passive temperature compensation can reduce an l8° incremental phase shift caused by a 30°C increase in ambient temperature through a cascade of four l0-pole Butterworth, edge-coupled, MIC filters fabricated on fused silica to within 2°.
{"title":"Temperature-Compensated MIC Filter for Onboard Satellite Regenerators","authors":"F. Assal, A. Berman, C. Mahle","doi":"10.1109/EUMA.1978.332572","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332572","url":null,"abstract":"This paper presents a temperature compensation technique for microwave integrated circuit (MIC) filters that may be employed in the implementation of onboard satellite DQPSK regenerators. These regenerators require extremely stable phase references for demodulation and bit-timing recovery. It has been found that passive temperature compensation can reduce an l8° incremental phase shift caused by a 30°C increase in ambient temperature through a cascade of four l0-pole Butterworth, edge-coupled, MIC filters fabricated on fused silica to within 2°.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"395 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121792929","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 : 1978-10-01DOI: 10.1109/EUMA.1978.332586
F. Tischer
Discrepancies between theoretical and experimental values of the surface resistance of metals observed at millimeter wavelengths are analyzed. Experiments with carefully prepared plane and rough copper surfaces and precision measurements of waveguide losses are described and the results discussed.
{"title":"Surface Characteristics of Metals and Waveguide Attenuation at Millimeter-Wave Frequencies between 25 and 180 GHz","authors":"F. Tischer","doi":"10.1109/EUMA.1978.332586","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332586","url":null,"abstract":"Discrepancies between theoretical and experimental values of the surface resistance of metals observed at millimeter wavelengths are analyzed. Experiments with carefully prepared plane and rough copper surfaces and precision measurements of waveguide losses are described and the results discussed.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125850806","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 : 1978-10-01DOI: 10.1109/EUMA.1978.332590
A. Mamouni, Y. Leroy, Y. Houdas, Y. Moschetto
Passive microwave sensors allow subcutaneous temperature measurements in living tissues. A previously presented method was improved and probes were carried out. The accuracy of this apparatus, which works at 9 GHzwith a bandwidth 1 GHz, is tested on lossy liquids and on living tissues (animal). In the case of man, variations of subcutaneous temperature (radiometric method) and skin temperature (thermocouple) are recorded during physical activity. The difference between these two sets of results shows the importance of this non invasive thermographic method for thermoregulation investigation.
{"title":"Passive Subcutaneous Temperature Measurement for Investigation of Thermoregulation","authors":"A. Mamouni, Y. Leroy, Y. Houdas, Y. Moschetto","doi":"10.1109/EUMA.1978.332590","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332590","url":null,"abstract":"Passive microwave sensors allow subcutaneous temperature measurements in living tissues. A previously presented method was improved and probes were carried out. The accuracy of this apparatus, which works at 9 GHzwith a bandwidth 1 GHz, is tested on lossy liquids and on living tissues (animal). In the case of man, variations of subcutaneous temperature (radiometric method) and skin temperature (thermocouple) are recorded during physical activity. The difference between these two sets of results shows the importance of this non invasive thermographic method for thermoregulation investigation.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123418801","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 : 1978-10-01DOI: 10.1109/EUMA.1978.332531
R. Burton
The detection and accurate measurement by probes of surface current density distributions is a tedious and costly experimental process. A technique for the rapid measurement of the magnitude of these distributions by an infrared scanner is presented. By utilizing the small but significant 12R heating effects of the surface current on antennas and scatterers with prepared surfaces, thermal distributions are measured and quantized into various color levels and presented on a color-TV monitor. The measurements and color quantized results are compared with actual probe measurements.
{"title":"Real Time Infrared Detection of Surface Current Density Distributions","authors":"R. Burton","doi":"10.1109/EUMA.1978.332531","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332531","url":null,"abstract":"The detection and accurate measurement by probes of surface current density distributions is a tedious and costly experimental process. A technique for the rapid measurement of the magnitude of these distributions by an infrared scanner is presented. By utilizing the small but significant 12R heating effects of the surface current on antennas and scatterers with prepared surfaces, thermal distributions are measured and quantized into various color levels and presented on a color-TV monitor. The measurements and color quantized results are compared with actual probe measurements.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123451208","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 : 1978-10-01DOI: 10.1109/EUMA.1978.332532
B. Watson, A. Rudge, N. Adatia
It has been recently shown that the depolarisation and beam-squinting effects exhibited by offset parabolic reflector antennas can be suppressed by means of techniques based upon focal-plane field matching and the use of higher-order wave-guide modes. In the past prototype examples of such `matched-feed' devices have been limited to operation with a single hand of polarisation. The limitation has largely been imposed by the performance of the mode generating section of the matched-feed device. This paper describes the salient features of the design and evaluation of a compact dual-polarised mode-generator which provides a means of achieving simultaneous suppression of the cross-polar radiation for two orthogonal linear polarisations. Experimental data, obtained with a K-band prototype device, validate the overall performance of the mode generator when used within a matchedfeed' device to illuminate an accurately profiled offset parabolic reflector.
{"title":"Dual-Polarised Mode Generator for Cross-Polar Ccmpensation in Offset Parabolic Reflector Antennas","authors":"B. Watson, A. Rudge, N. Adatia","doi":"10.1109/EUMA.1978.332532","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332532","url":null,"abstract":"It has been recently shown that the depolarisation and beam-squinting effects exhibited by offset parabolic reflector antennas can be suppressed by means of techniques based upon focal-plane field matching and the use of higher-order wave-guide modes. In the past prototype examples of such `matched-feed' devices have been limited to operation with a single hand of polarisation. The limitation has largely been imposed by the performance of the mode generating section of the matched-feed device. This paper describes the salient features of the design and evaluation of a compact dual-polarised mode-generator which provides a means of achieving simultaneous suppression of the cross-polar radiation for two orthogonal linear polarisations. Experimental data, obtained with a K-band prototype device, validate the overall performance of the mode generator when used within a matchedfeed' device to illuminate an accurately profiled offset parabolic reflector.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125410038","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 : 1978-10-01DOI: 10.1109/EUMA.1978.332616
J. Prevot
The theoretical and experimental study of the reduction of the non-linearities of transistorized microwave amplifiers is explained here. The retained solution consists in comparing the input signal with the main amplifier's output signal. The intermodulation products created by the main amplifier are considered as an error signal which, after amplification, is re-injected at the appropriate amplitude level and phase value into the main network (this type of correction is called "feed forward"). The studied compensation networks allowed a 20 dB reduction of the intermodulation products' level. The adopted solutions are easily extrapolated and allow the compensation of amplifiers performing at higher frequencies and delivering higher powers.
{"title":"Study of the Linearity of a Transistorized Power Amplifier Operating in the 3.8 to 4.2. GHz Frequency Range","authors":"J. Prevot","doi":"10.1109/EUMA.1978.332616","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332616","url":null,"abstract":"The theoretical and experimental study of the reduction of the non-linearities of transistorized microwave amplifiers is explained here. The retained solution consists in comparing the input signal with the main amplifier's output signal. The intermodulation products created by the main amplifier are considered as an error signal which, after amplification, is re-injected at the appropriate amplitude level and phase value into the main network (this type of correction is called \"feed forward\"). The studied compensation networks allowed a 20 dB reduction of the intermodulation products' level. The adopted solutions are easily extrapolated and allow the compensation of amplifiers performing at higher frequencies and delivering higher powers.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125636218","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 : 1978-10-01DOI: 10.1109/EUMA.1978.332503
W. Menzel
The radiation characteristics of the first higher order mode of microstrip lines are investigated. As a result, a simple travelling wave antenna element is scribed, having a larger bandwidth compared with resonator antennas. A method to excite the first higher order mode is shown. A single antenna element is treated theoretically and experimentally, and an array of four antenna elements is demonstrated.
{"title":"A New Travelling Wave Antenna in Microstrip","authors":"W. Menzel","doi":"10.1109/EUMA.1978.332503","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332503","url":null,"abstract":"The radiation characteristics of the first higher order mode of microstrip lines are investigated. As a result, a simple travelling wave antenna element is scribed, having a larger bandwidth compared with resonator antennas. A method to excite the first higher order mode is shown. A single antenna element is treated theoretically and experimentally, and an array of four antenna elements is demonstrated.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130208654","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 : 1978-10-01DOI: 10.1109/EUMA.1978.332543
C. Fray, A. Papiernik
The theoretical attenuation of the shielded ring line operating in the fundamental dipolar hybrid mode is discussed and this guiding structure is shown to be low-loss when the distance between the rings and the shield is large. Measurements on a line consisting of equally spaced rings held by a teflon pipe and surrounded by a 10 cm diameter metallic pipe agree with theory. The shielded ring line can be a low-loss guide, but the attenuation value (12 dB/km for a copper structure) is somewhat higher than that of the open ring line (less than 5 dB/km).
{"title":"Attenuation of the Fundamental Dipolar Mode of the Shielded Ring Line","authors":"C. Fray, A. Papiernik","doi":"10.1109/EUMA.1978.332543","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332543","url":null,"abstract":"The theoretical attenuation of the shielded ring line operating in the fundamental dipolar hybrid mode is discussed and this guiding structure is shown to be low-loss when the distance between the rings and the shield is large. Measurements on a line consisting of equally spaced rings held by a teflon pipe and surrounded by a 10 cm diameter metallic pipe agree with theory. The shielded ring line can be a low-loss guide, but the attenuation value (12 dB/km for a copper structure) is somewhat higher than that of the open ring line (less than 5 dB/km).","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"165 11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127556347","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 : 1978-10-01DOI: 10.1109/EUMA.1978.332497
P. Lesartre, R. Dessert, J. Magarshack
An 11 GHz FET oscillator with a stable Ba2Ti9O20 resonator has been developed for the local oscillator of a satellite TV front-end. It has excellent frequency and amplitude stability, low noise and high efficiency. An original amplitude control provides the means for optimisation of the mixer drive. A generalised circuit analysis will be presented which optimises the oscillation conditions whilst avoiding parasitic frequencies. Complete measurements will be given.
{"title":"Stable FET Local Oscillator at 11 GHz with Electronic Amplitude Control","authors":"P. Lesartre, R. Dessert, J. Magarshack","doi":"10.1109/EUMA.1978.332497","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332497","url":null,"abstract":"An 11 GHz FET oscillator with a stable Ba2Ti9O20 resonator has been developed for the local oscillator of a satellite TV front-end. It has excellent frequency and amplitude stability, low noise and high efficiency. An original amplitude control provides the means for optimisation of the mixer drive. A generalised circuit analysis will be presented which optimises the oscillation conditions whilst avoiding parasitic frequencies. Complete measurements will be given.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122624816","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 : 1978-10-01DOI: 10.1109/EUMA.1978.332578
P. Baudet, M. Binet, D. Boccon-Gibod, L. Hollan
More than 1 W att output power has been achieved at 10 GHz with GaAs MESFETs which are produced using a self-alignment technique. Principal improvements in performances are due to an increased maximum operating voltage of the Schottky diodes. This is obtained with a graded doping profile and there is in addition an improved linearity of the MESFET's. A technique of interconnection of the sources by metallic columns through the substrate has been used and a similar structure using N+ columns instead of the metal will be proposed. These techniques simplify the mounting of the transistor and reduces the parasitic inductances in series with the sources.
{"title":"Self-Aligned GaAs Power Mesfet's for X-Band","authors":"P. Baudet, M. Binet, D. Boccon-Gibod, L. Hollan","doi":"10.1109/EUMA.1978.332578","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332578","url":null,"abstract":"More than 1 W att output power has been achieved at 10 GHz with GaAs MESFETs which are produced using a self-alignment technique. Principal improvements in performances are due to an increased maximum operating voltage of the Schottky diodes. This is obtained with a graded doping profile and there is in addition an improved linearity of the MESFET's. A technique of interconnection of the sources by metallic columns through the substrate has been used and a similar structure using N+ columns instead of the metal will be proposed. These techniques simplify the mounting of the transistor and reduces the parasitic inductances in series with the sources.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117086645","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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