S. Long, J. Kinoshita, R. D. Fairman, R. Hamilton, I. Ku, F. B. Fank
{"title":"Highly Reliable CW and Pulsed GaAs Read Diodes","authors":"S. Long, J. Kinoshita, R. D. Fairman, R. Hamilton, I. Ku, F. B. Fank","doi":"10.1109/EUMA.1976.332239","DOIUrl":"https://doi.org/10.1109/EUMA.1976.332239","url":null,"abstract":"The development of GaAs Read Impatt diodes has resulted in the availability of reliable, long life, highly efficient CW and pulsed medium power devices. The use of a hi-lo Read structure with a grown GaAs p-n junction provides for the long life and highly efficient medium power devices. CW efficiencies in excess of 15% are routinely available at power levels of 2-3 watts. Pulse power outputs above 15 watts and with efficiencies of 20% are standard. For the pulsed devices, the results were obtained with a duty cycle of 25%. With these performances, lifetimes can be predicted to be in the 107 hour range for junction temperatures of 200°.","PeriodicalId":377507,"journal":{"name":"1976 6th European Microwave Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132213435","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}
{"title":"New Low Gain S-Band Satellite Antenna with Suppressed Back Radiation","authors":"N. Albertsen, P. Balling, F. Laursen","doi":"10.1109/EUMA.1976.332301","DOIUrl":"https://doi.org/10.1109/EUMA.1976.332301","url":null,"abstract":"Theoretical and experimental results are presented for a waveguide antenna with a cardoid-shaped pattern. The antenna, which operates in the S band, is proposed for telemetry and telecommand on future scientific satellites. The radiation takes place through eight axial slots placed near the end of a circular waveguide which carries a rotating TEll mode. A conical reflector may be attached to the waveguide structure to shape the pattern, which is calculated by solving the electrical field integral equation utilizing the rotational symmetry of the body. The paper also. deals with the excitation of the TEll waveguide mode and the matching of the slots to this mode.","PeriodicalId":377507,"journal":{"name":"1976 6th European Microwave Conference","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133928782","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}
{"title":"Problems Associated with Long Path Communication Links in Tropical Areas","authors":"V.T.V. Sbarma","doi":"10.1109/EUMA.1976.332323","DOIUrl":"https://doi.org/10.1109/EUMA.1976.332323","url":null,"abstract":"Southern Railway have collected extensive data on microwave propagation over their 2000 KM net-work for over five years. The main problem of long path communication link is the occurrence of momentary deep fades of 10 to 40 dB for very short duration of 1 to 2 seconds. These dropouts. account for 80% of the total severe fading and about 60% of the total outage occur. in pre-summer months viz., February, March and April. The probability occurrence of deep fades increases very rapidly with distance and a computerised study indicate. that it is proportional to (Distance)10. Comparative study of Space Diversity and Frequency Diversity for long path indicates that Space Diversity reduces the outage time by 50% whereas Frequency Diversity wih even a small frequency separation of 1% reduces the outage by as much as 90%. Frequency Diversity, therefore, appears to be definitely more suited to tropical areas subjected to heavy momentary outages tban Space Diversity.","PeriodicalId":377507,"journal":{"name":"1976 6th European Microwave Conference","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122677629","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}
{"title":"Theory and Applications of Broadband Microstrip Antennas","authors":"G. Dubost, M. Nicolas, H. Havot","doi":"10.1109/EUMA.1976.332285","DOIUrl":"https://doi.org/10.1109/EUMA.1976.332285","url":null,"abstract":"An experimental parametric study of a microstrip antenna is given. This antenna is a flat, broad-folded dipole parallel to and at a short distance from a reflector plane. Radiating characteristics are excellent, and in particular bandwidth is sufficient enough for various applications in spite of a very small antenna thickness. An assimilation to a couple of radiating series strip lines permits to explain the antenna functioning and to refind the experimental results. We take account of radiating resistance and ohmic resistance losses spread allover the strips lengths.","PeriodicalId":377507,"journal":{"name":"1976 6th European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124405265","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}
{"title":"Active Receiving Thick Folded Dipoles Array with Good Sensitivity Between 0.4 GHz and 1 GHz","authors":"J. Daniel, G. Dubost","doi":"10.1109/EUMA.1976.332300","DOIUrl":"https://doi.org/10.1109/EUMA.1976.332300","url":null,"abstract":"This paper describes the design and testing of a broadband active thick-folded-dipole, used for reception, between 0.4 and 1 GHz. This active antenna which exibits a good sensitivity can be used as an element of a directive array without a loss of bandwidth and sensitivity. For example an array of two active folded-dipoles in front of a reflector plane gives directivity about 10 dB upon an isotropic source between 0.4 and 1 GHz, and a better sensitivity than the isolated active antenna.","PeriodicalId":377507,"journal":{"name":"1976 6th European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129234929","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}
{"title":"An Economical Microwave Link System for 2700 Telephone Channels","authors":"E. Myrseth","doi":"10.1109/EUMA.1976.332321","DOIUrl":"https://doi.org/10.1109/EUMA.1976.332321","url":null,"abstract":"This system, carrying 2700 telephone channels per carrier in the 6 GHz band, meets all relevant CCIR recommendations. Key features include easy maintenance during operation, all solid state except for the very high efficiency TWT, 300 channels insert. Computer aided design of SHF and IF filters and circuits, optimized for flat delay response. AGC ahead of receiver preamplifier, low noise figure and high dynamic range AGC amplifier, lead to optimized performance during fading conditions. A novel amplitude limiter of simple construction.","PeriodicalId":377507,"journal":{"name":"1976 6th European Microwave Conference","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115580089","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}
{"title":"Present and Future Capability of Millimeter Wave Pumped Paramps","authors":"J. Whelehan","doi":"10.1109/EUMA.1976.332333","DOIUrl":"https://doi.org/10.1109/EUMA.1976.332333","url":null,"abstract":"Parametric amplifiers have been extensively used in many varied and sophisticated applications (communications, radar, ECM, etc.), through Ku-band, in which relatively high cutoff frequency packaged varactors, with a self-resonance frequency in the 20- to 30-GHz range, have been utilized. The extension of paramps into higher frequencies (above 20 GHz) had been limited by both the cutoff frequency of the varactor, and the package parasitic reactances and losses that limited the upper useful frequency. Over the past few years, significant improvements in varactor technology have been made that have yielded much higher cutoff frequencies [approximately 600 GHz at zero (0) volt bias], coupled with low parasities, that result in a self-resonant frequency in the 60-GHz region. A diagram of this field proven varactor is shown in Figure 1. This improved varactor has made extremely low-noise temperature paramps available in the microwave region and has also resulted in the achievement of broader instantaneous bandwidths than had been previously obtained. Recently, further improvements in varactor technology have led to higher cutoff frequencies [above 1000 GHz @ zero (0) vikt bias] that will further enhance not only the achievable noise temperature and bandwidth capability of paramps in the microwave region, but will also enable the development of completely solid-state paramps in the millimeter wave region. These newly developed varactors have already been successfully used, up to 300 GHz, as frequency multipliers. The recent developments and expected performance, utilizing these advanced varactors, willbe presented.","PeriodicalId":377507,"journal":{"name":"1976 6th European Microwave Conference","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128089489","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}
{"title":"Low Conversion Losses up and Downconverters, Using Dielectric Resonators for Application with Millimetric Telecommunication Systems","authors":"Mahieu Jean Rene","doi":"10.1109/EUMA.1976.332357","DOIUrl":"https://doi.org/10.1109/EUMA.1976.332357","url":null,"abstract":"This paper shows that it is now possible to design devices incorporating dielectric resonators for frequencies up to 40 GHz. Theoretical models have been studied in order to compute with the required accuracy the resonant frequency and coupling coefficients between two resonators and a resonator and a microstrip line. Frequency temperature coefficient variation less than 2 ppm/°C has been achieved using \"composite structures\". These new temperature compensated resonators have been used in association with a millimetric microstrip low noise mixer and with a millimetric waveguide up converter. In this way, the suppression of the image bandwidth frequency for mixers, or of the lower sideband for up converters leads to a decrease of conversion losses higher than 1 dB.","PeriodicalId":377507,"journal":{"name":"1976 6th European Microwave Conference","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128164026","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}
{"title":"A Novel FM Detector for Suppression of Interchannel Interference","authors":"T. Sundresh, F. Cassara, H. Schachter","doi":"10.1109/EUMA.1976.332318","DOIUrl":"https://doi.org/10.1109/EUMA.1976.332318","url":null,"abstract":"In this paper a novel FM detector capable of suppressing the degradation in receiver performance due to the presence of an interfering signal is presented. This novel detector consists of two phase-locked loop FM demodulators interconnected in such a manner to permit one phase-locked loop to lock on to and track the stronger received FM signal while the other loop tracks the weaker of the two received FM signals. The detector has the capability of demodulating both the desired received FM signal as well as the interferer even for the cas e when both signals occupy the same frequency band. Experimental results demonstrating such capability are presented.","PeriodicalId":377507,"journal":{"name":"1976 6th European Microwave Conference","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124354329","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}
{"title":"Two Dimensional Analysis of the GaAs Double Hetero Stripe-Geometry Laser","authors":"T. Rozzi, T. Itoh","doi":"10.1109/EUMA.1976.332324","DOIUrl":"https://doi.org/10.1109/EUMA.1976.332324","url":null,"abstract":"The GaAlAs/GaAs stripe-geometry laser is analyzed using a new technique called the effective dielectric constant (EDC) method. Unlike previously reported techniques, use of the EDC method allows both vertical and sideward directions in the cross section of the laser to be taken into account in analyzing the field confinement mechanism. Computed data on field concentration and cutoff behavior are presented.","PeriodicalId":377507,"journal":{"name":"1976 6th European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130482885","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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