Pub Date : 1978-10-01DOI: 10.1109/EUMA.1978.332502
M. Calvo, J. S. Miñana
A new method of exciting axial slots cut on a circular cylinder is presented. The interior volume of the cylinder is divided up into a number of wedge waveguides equal to the required number of slots along the circunference of the cylinder cross section. Each of these slots is thus excited independently by the corresponding wedge waveguide and its coupling can be controlled by changing its distances to the centerline of the waveguide curved wall. Theoretical expressions for the Value of the slot admittance in the wedge waveguide are given and compared with measurements on an X-band model. The new structure can be applied to microwave beacons and UHF broadcast transmitters requiring patterns which are more or less selective in the horizontal plane and narrow in the vertical plane.
{"title":"A New Method of Exciting Axial Slots Cut on a Circular Cylinder","authors":"M. Calvo, J. S. Miñana","doi":"10.1109/EUMA.1978.332502","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332502","url":null,"abstract":"A new method of exciting axial slots cut on a circular cylinder is presented. The interior volume of the cylinder is divided up into a number of wedge waveguides equal to the required number of slots along the circunference of the cylinder cross section. Each of these slots is thus excited independently by the corresponding wedge waveguide and its coupling can be controlled by changing its distances to the centerline of the waveguide curved wall. Theoretical expressions for the Value of the slot admittance in the wedge waveguide are given and compared with measurements on an X-band model. The new structure can be applied to microwave beacons and UHF broadcast transmitters requiring patterns which are more or less selective in the horizontal plane and narrow in the vertical plane.","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":"114056064","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.1978.332594
P. Neelakantaswamy, K. Gupta, D. Banerjee
A simple and compact gaussian beam launcher to produce a focused microwave field for selective Partial-body exposures in biological experiments is described. The proposed structure consists of a Potter's dual mode horn with slight modifications and the aperture of this hom is loaded with a dielectric sphere (lens). It is shown that the resulting diffracted field in the image-space of the lens is a near-circular gaussian-beam with a high focusing factor. The details of an X-band test launcher with measured and theoretical results are presented. The simplicity of the proposed structure enables a compact and light-weight design of the launcher at the diathermy frequency of 2450 MHz.
{"title":"A Simple Microwave Gaussian Beam-Launcher for Selective Partial-Body Exposure of Biological Substances","authors":"P. Neelakantaswamy, K. Gupta, D. Banerjee","doi":"10.1109/EUMA.1978.332594","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332594","url":null,"abstract":"A simple and compact gaussian beam launcher to produce a focused microwave field for selective Partial-body exposures in biological experiments is described. The proposed structure consists of a Potter's dual mode horn with slight modifications and the aperture of this hom is loaded with a dielectric sphere (lens). It is shown that the resulting diffracted field in the image-space of the lens is a near-circular gaussian-beam with a high focusing factor. The details of an X-band test launcher with measured and theoretical results are presented. The simplicity of the proposed structure enables a compact and light-weight design of the launcher at the diathermy frequency of 2450 MHz.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"9 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":"126868388","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.1978.332500
H. Oltman
An electromagnetically Coupled (EMC) member of the microstrip dipole antenna family is described. Several configurations differing in the dipole location and in the amounts of electric and magnetic coupling to the micro-strip line yield different bandwidths, efficiencies and construction simplicity. The transformer action inherent in EM coupling allows a wide variation in matching conditions. Radiation characteristics of the element and examples of arrays constructed with the element are described.
{"title":"Electromagnetically Coupled Microstrip Dipole Antenna Elements","authors":"H. Oltman","doi":"10.1109/EUMA.1978.332500","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332500","url":null,"abstract":"An electromagnetically Coupled (EMC) member of the microstrip dipole antenna family is described. Several configurations differing in the dipole location and in the amounts of electric and magnetic coupling to the micro-strip line yield different bandwidths, efficiencies and construction simplicity. The transformer action inherent in EM coupling allows a wide variation in matching conditions. Radiation characteristics of the element and examples of arrays constructed with the element are described.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"1 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":"129450756","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.1978.332537
L. Courtois, J. Mahieu
In telecommunication systems (by hertzian wave or circular waveguide) the transmitted signals are liable to important modifications due particularly to the variation of the group delay introduced by the transmission support and the equipments. It is therefore necessary in order to process and exploit the signal in good conditions, to use group delay equalizers. The dispersive properties of magnetostatic surface waves propagating in magnetic thin films allow the conception of a new generation of tunable group delay equalizers with a great flexibility of use. The theoretical analysis of propagation modes and especially of magnetostatic surface modes in a YIG thin film has been carried out. The methods and means allowing the characterization of films from the stand point of their mechanical, crystallographic and magnetic properties were defined and established. Lastly, experimental check ups were carried out and led to the realization of models whose electric characteristics are presented.
{"title":"Magnetostatic Surface Wave Group Delay Equalizer","authors":"L. Courtois, J. Mahieu","doi":"10.1109/EUMA.1978.332537","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332537","url":null,"abstract":"In telecommunication systems (by hertzian wave or circular waveguide) the transmitted signals are liable to important modifications due particularly to the variation of the group delay introduced by the transmission support and the equipments. It is therefore necessary in order to process and exploit the signal in good conditions, to use group delay equalizers. The dispersive properties of magnetostatic surface waves propagating in magnetic thin films allow the conception of a new generation of tunable group delay equalizers with a great flexibility of use. The theoretical analysis of propagation modes and especially of magnetostatic surface modes in a YIG thin film has been carried out. The methods and means allowing the characterization of films from the stand point of their mechanical, crystallographic and magnetic properties were defined and established. Lastly, experimental check ups were carried out and led to the realization of models whose electric characteristics are presented.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"4 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":"129329397","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.1978.332551
G. Smith, G. Berretta
The practical problems associated with predicting intermodulation performance of nonlinear amplifiers in multicarrier operation are discussed, with emphasis on the utility of these methods within the laboratory. A simple technique of calculating this performance and simultaneously compensating, in the predicted intermodulation, for errors in the monocarrier characterisation is presented, based on calculation of total intermodulation power and on supplementary three-carrier measurements.
{"title":"Treatment of Error in Characterisation of Nonlinear Amplifiers","authors":"G. Smith, G. Berretta","doi":"10.1109/EUMA.1978.332551","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332551","url":null,"abstract":"The practical problems associated with predicting intermodulation performance of nonlinear amplifiers in multicarrier operation are discussed, with emphasis on the utility of these methods within the laboratory. A simple technique of calculating this performance and simultaneously compensating, in the predicted intermodulation, for errors in the monocarrier characterisation is presented, based on calculation of total intermodulation power and on supplementary three-carrier measurements.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"41 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":"129987896","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.1978.332599
D. Pavlidis, David Smith, H. Hartnagel
The wave propagation in circular shielded dielectric waveguides consisting of composite PTFE and BaTiO3 loaded PTFE material is studied both theoretically and experimentally. Using the developed theory the main parameters of the structure (cut-off and geometrical characteristics) were optimised for X-band BaTiO3/PTFE transmission systems. A minimum launching efficiency of 88% was achieved. Microwave absorption and subsequently conversion to heat was obtained with a specially developed solid load which could successfully operate up to 3 KW power levels. The low and high frequency breakdown of He/O2 gases, as required by divers working at depth, were studied in view of their importance in the operation of dielectric waveguide underwater transmission systems.
{"title":"Circular Composite Dielectric Waveguides and their Applications in HEll Mode High Power Microwave Heating Systems","authors":"D. Pavlidis, David Smith, H. Hartnagel","doi":"10.1109/EUMA.1978.332599","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332599","url":null,"abstract":"The wave propagation in circular shielded dielectric waveguides consisting of composite PTFE and BaTiO3 loaded PTFE material is studied both theoretically and experimentally. Using the developed theory the main parameters of the structure (cut-off and geometrical characteristics) were optimised for X-band BaTiO3/PTFE transmission systems. A minimum launching efficiency of 88% was achieved. Microwave absorption and subsequently conversion to heat was obtained with a specially developed solid load which could successfully operate up to 3 KW power levels. The low and high frequency breakdown of He/O2 gases, as required by divers working at depth, were studied in view of their importance in the operation of dielectric waveguide underwater transmission systems.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"7 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":"122106175","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.1978.332610
M. Hines
The classical small-signal frequency-domain theory of diode mixers has been repeatedly misapplied for low-loss band-limited circuits. Previously published theoretical results, which describe low-loss limits, are erroneous and misleading. The errors are ascribed to inadmissable matrix truncation. Single-diode mixers are inherently lossy devices, even with ideal diodes.
{"title":"Failure of the Classical Mathematical Model in the Analysis of Low-Loss Band-Limited Mixers","authors":"M. Hines","doi":"10.1109/EUMA.1978.332610","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332610","url":null,"abstract":"The classical small-signal frequency-domain theory of diode mixers has been repeatedly misapplied for low-loss band-limited circuits. Previously published theoretical results, which describe low-loss limits, are erroneous and misleading. The errors are ascribed to inadmissable matrix truncation. Single-diode mixers are inherently lossy devices, even with ideal diodes.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"68 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":"133530528","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.1978.332510
K. Gruner
Passive mapping of the environment by detection of natural radiation of objects is possible in the microwave region in the same way as for the visible and infrared part of the electromagnetic spectrum. Because of the minor weather sensitivity and the significantly different radiation behavior of most media in this part of the spectrum by means of which further informations can be obtained, microwave radiometry has gained great interest for civil and military remote sensing applications.
{"title":"Advances in the Field of Microwave Radiometry Generated by the Technological Progress in the Millimeter Wave Region","authors":"K. Gruner","doi":"10.1109/EUMA.1978.332510","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332510","url":null,"abstract":"Passive mapping of the environment by detection of natural radiation of objects is possible in the microwave region in the same way as for the visible and infrared part of the electromagnetic spectrum. Because of the minor weather sensitivity and the significantly different radiation behavior of most media in this part of the spectrum by means of which further informations can be obtained, microwave radiometry has gained great interest for civil and military remote sensing applications.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"2 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":"133097013","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.1978.332566
M. Houdart
Following a general consideration of the concept of directional couplers in an inhomogeneous medium and physically asymmetrical couplers, this paper reviews various new types of MIC couplers carring, sometimes simultaneously, different propagation modes (microstrip, coplanar line, slot 1ine). Experimental results are presented for the performance obtained with a 2.2. dB coupler of simple design of the "microstrip - coplanar" type.
{"title":"Coupled-Line Directional Couplers for M.I.C.","authors":"M. Houdart","doi":"10.1109/EUMA.1978.332566","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332566","url":null,"abstract":"Following a general consideration of the concept of directional couplers in an inhomogeneous medium and physically asymmetrical couplers, this paper reviews various new types of MIC couplers carring, sometimes simultaneously, different propagation modes (microstrip, coplanar line, slot 1ine). Experimental results are presented for the performance obtained with a 2.2. dB coupler of simple design of the \"microstrip - coplanar\" type.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"9 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":"133257303","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.1978.332564
Carsten Hede
A l.2 Gbit/s RZ pseudo random bit generator using multiplexing of six 200 Mbit/s channels, and a GaAs-MESFET gate circuit which exhibits both high speed and simplicity are presented. As a new contribution to the treatment of pseudo random sequences it is shown how the autocorrelation function and the Fourier spectrum of a sequence obtained by multiplexing are distorted. These functions may be shaped to a desired form by proper choice of mutual delays of sequences contributing to the multiplexing.
{"title":"1.2 GBit/s Pseudo Random Pulse Generator Using Multiplexing with GaAs Mesfet Gates","authors":"Carsten Hede","doi":"10.1109/EUMA.1978.332564","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332564","url":null,"abstract":"A l.2 Gbit/s RZ pseudo random bit generator using multiplexing of six 200 Mbit/s channels, and a GaAs-MESFET gate circuit which exhibits both high speed and simplicity are presented. As a new contribution to the treatment of pseudo random sequences it is shown how the autocorrelation function and the Fourier spectrum of a sequence obtained by multiplexing are distorted. These functions may be shaped to a desired form by proper choice of mutual delays of sequences contributing to the multiplexing.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"62 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":"127616823","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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