Pub Date : 1978-10-01DOI: 10.1109/EUMA.1978.332506
M. Aylward, N. Williams
The design of a class of filters for use in millimetre wave integrated circuits is described. These filters use resonant rings of dielectric image line, the theory of which is briefly described. The synthesis of the circuit elements necessary to realise the filter is explained and a practical tuning element is described. Several theoretical design examples are given and the results from an experimental filter are given.
{"title":"The Design of Multipole Filters for use in Millimetre Wave Image Line Integrated Circvits","authors":"M. Aylward, N. Williams","doi":"10.1109/EUMA.1978.332506","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332506","url":null,"abstract":"The design of a class of filters for use in millimetre wave integrated circuits is described. These filters use resonant rings of dielectric image line, the theory of which is briefly described. The synthesis of the circuit elements necessary to realise the filter is explained and a practical tuning element is described. Several theoretical design examples are given and the results from an experimental filter are given.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"6 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":"115499114","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.1978.332583
K. Fujisawa, Yukio Yamamoto, Tetsuji Ito, Toru Iwai
This device is to visualize waveform analysis up to mm-waves. The operation is based on two distinctive principles. The first is the sampling of the waveform by a repeated electron beam pulse synchronous with it. The second is the usage of a negative feed back system, which cancells the r.f. deflection of the electron beam pulse by a d.c.control voltage, the latter being proportional to the sampled wave-amplitude and thus giving information to it. The waveform is reproduced by plotting the above control voltage versus the phase position of the sampling. An experimental tube was designed and built to be used up to K-band. It was tested in X-band, and showed good characteristics.
{"title":"Sampling Cathode-Ray Tube Device for Microwave Waveform Analysis","authors":"K. Fujisawa, Yukio Yamamoto, Tetsuji Ito, Toru Iwai","doi":"10.1109/EUMA.1978.332583","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332583","url":null,"abstract":"This device is to visualize waveform analysis up to mm-waves. The operation is based on two distinctive principles. The first is the sampling of the waveform by a repeated electron beam pulse synchronous with it. The second is the usage of a negative feed back system, which cancells the r.f. deflection of the electron beam pulse by a d.c.control voltage, the latter being proportional to the sampled wave-amplitude and thus giving information to it. The waveform is reproduced by plotting the above control voltage versus the phase position of the sampling. An experimental tube was designed and built to be used up to K-band. It was tested in X-band, and showed good characteristics.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"106 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":"131478383","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.1978.332565
W. Menzel
In the last years, a variety of microstrip discontinuities have been analysed using a waveguide model with frequency dependent parameters. This contribution shows an application of these calculation techniques to fast digital signal analysis of baseband and carrier frequency circuits in microstrip. The signals are described by their Fourier coefficients, and the circuit response is calculated using the frequency dependent reflection and transmission properties of the microstrip circuit. A number of examples are given, together with experimental results, showing a close agreement between theory and experiment.
{"title":"Gbit/s-Pulse Propagation in Microstrip Discontinuities","authors":"W. Menzel","doi":"10.1109/EUMA.1978.332565","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332565","url":null,"abstract":"In the last years, a variety of microstrip discontinuities have been analysed using a waveguide model with frequency dependent parameters. This contribution shows an application of these calculation techniques to fast digital signal analysis of baseband and carrier frequency circuits in microstrip. The signals are described by their Fourier coefficients, and the circuit response is calculated using the frequency dependent reflection and transmission properties of the microstrip circuit. A number of examples are given, together with experimental results, showing a close agreement between theory and experiment.","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":"131630687","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.1978.332491
K. Ivanov
The propagation of circularly symmetrical mode in an infinitely long thin-wire helix, wound on a latching ferrite cylinder, magnetised azimuthally to remanence and surrounded by homogeneous, isotropic, lossless dielectric and perfectly conducting metallic shield is studied analytically. The characteristic equation of the system, involving the normalized phase constant, structure geometry, parameters of both media and the frequency is derived in terms of modified Bessel functions and Kummer confluent hypergeometric functions. The nonreciprocal phase characteristics of the structure, assuming Marconi latching ferrite L1A and thermal conducting dielectrics are presented in normalized form for opposite directions of remanent flux, showing application of the system as practical remanent latching phaser.
{"title":"Analytical Study of Helical Latching Ferrite Phaser Structure","authors":"K. Ivanov","doi":"10.1109/EUMA.1978.332491","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332491","url":null,"abstract":"The propagation of circularly symmetrical mode in an infinitely long thin-wire helix, wound on a latching ferrite cylinder, magnetised azimuthally to remanence and surrounded by homogeneous, isotropic, lossless dielectric and perfectly conducting metallic shield is studied analytically. The characteristic equation of the system, involving the normalized phase constant, structure geometry, parameters of both media and the frequency is derived in terms of modified Bessel functions and Kummer confluent hypergeometric functions. The nonreciprocal phase characteristics of the structure, assuming Marconi latching ferrite L1A and thermal conducting dielectrics are presented in normalized form for opposite directions of remanent flux, showing application of the system as practical remanent latching phaser.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"55 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":"132105839","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.1978.332579
Chiung-Tung Li, Philip T. Chen, Patrick H. Wang
An ion-implanted, 0.5 micron gate GaAs MESFET designed for K-band (18-26 GHz) applications is described in this paper. Silicon implantation was used to form both the channel and the N+ contact layers. The device has 9.8 dB gain at 18 GHz and its extrapolated fmax is about 80 GHz. At 25 GHz, it achieved 12.1 dBm output power as a tunable oscillator, and 11 dBmoutput power with 16 dB gain as a narrow band reflection type of amplifier.
{"title":"A K-Band ION Implanted GaAs FET","authors":"Chiung-Tung Li, Philip T. Chen, Patrick H. Wang","doi":"10.1109/EUMA.1978.332579","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332579","url":null,"abstract":"An ion-implanted, 0.5 micron gate GaAs MESFET designed for K-band (18-26 GHz) applications is described in this paper. Silicon implantation was used to form both the channel and the N+ contact layers. The device has 9.8 dB gain at 18 GHz and its extrapolated fmax is about 80 GHz. At 25 GHz, it achieved 12.1 dBm output power as a tunable oscillator, and 11 dBmoutput power with 16 dB gain as a narrow band reflection type of amplifier.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"15 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":"116849935","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.1978.332522
K. Sachse, A. Sawicki
The paper discusses the properties of new microstrip transmission lines using a slot in the ground-plane. These lines have high characteristic impedance and their attenuation and frequency dispersion as well are small. A very tightly coupled cross-section of microstrip lines may be constructed using the new structures of coupled-lines. The numerical computations of the characteristic impedance and phase velocity of the single-and coupled-lines are given. In the variational method an approximated functions of the charge density on the strip and the potential in the slot in order to fulfil of the complicated boundary conditions caused by the slot and the multi-layered dielectric are evaluated. Then the potential distribution on the strip and the capacitance are computed using the variational expression in the Fourier-transformed domain. The applications of the new microstrip lines in MIC and some experimental results are presented.
{"title":"New Microstrip Transmission Lines for Microwave Integrated Circuits","authors":"K. Sachse, A. Sawicki","doi":"10.1109/EUMA.1978.332522","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332522","url":null,"abstract":"The paper discusses the properties of new microstrip transmission lines using a slot in the ground-plane. These lines have high characteristic impedance and their attenuation and frequency dispersion as well are small. A very tightly coupled cross-section of microstrip lines may be constructed using the new structures of coupled-lines. The numerical computations of the characteristic impedance and phase velocity of the single-and coupled-lines are given. In the variational method an approximated functions of the charge density on the strip and the potential in the slot in order to fulfil of the complicated boundary conditions caused by the slot and the multi-layered dielectric are evaluated. Then the potential distribution on the strip and the capacitance are computed using the variational expression in the Fourier-transformed domain. The applications of the new microstrip lines in MIC and some experimental results are presented.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"70 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":"121713847","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.1978.332581
P. White, B. L. Hewett, J. Turner
Accelerated life tests on GaAs power FETs have revealed two failure mechanisms. The first, associated with Au/Al interaction at the bonding pads, is gate void formation for which the estimated activation energy of 2eV in air ambient gives an extrapolated MTTF at 70°C channel temperature in excess of 108 hours. Devices with Au bond wires to the gate bonding pads show no void formation but failure is associated with excessive drain metal migration. Estimated MTTF at 70°C channel temperature is comparable to the gate failure mode. A detailed comparison of the two failure modes and conclusions as to which dominates under normal operating conditions await the outcome of constant stress tests on devices with both wire bond configurations.
{"title":"Reliability Investigations of GaAs Power FETs with Aluminium Gate Metallisation","authors":"P. White, B. L. Hewett, J. Turner","doi":"10.1109/EUMA.1978.332581","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332581","url":null,"abstract":"Accelerated life tests on GaAs power FETs have revealed two failure mechanisms. The first, associated with Au/Al interaction at the bonding pads, is gate void formation for which the estimated activation energy of 2eV in air ambient gives an extrapolated MTTF at 70°C channel temperature in excess of 108 hours. Devices with Au bond wires to the gate bonding pads show no void formation but failure is associated with excessive drain metal migration. Estimated MTTF at 70°C channel temperature is comparable to the gate failure mode. A detailed comparison of the two failure modes and conclusions as to which dominates under normal operating conditions await the outcome of constant stress tests on devices with both wire bond configurations.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"5 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":"115535390","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.1978.332557
A. Leber, T. Flattau
Significant improvements in the gain stability and overall performance of microwave radiometers have been achieved with the use of a selfbalancing gain modulation technique. This technique, in combination with automatic thermal calibration, is particularly well suited for remote sensing radiometric applications. The essential features of such a radiometer, including typical data obtained from a spaceborne satellite, is presented to show the instrument's utility.
{"title":"Improved Microwave Radiometry for Remote Sensing","authors":"A. Leber, T. Flattau","doi":"10.1109/EUMA.1978.332557","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332557","url":null,"abstract":"Significant improvements in the gain stability and overall performance of microwave radiometers have been achieved with the use of a selfbalancing gain modulation technique. This technique, in combination with automatic thermal calibration, is particularly well suited for remote sensing radiometric applications. The essential features of such a radiometer, including typical data obtained from a spaceborne satellite, is presented to show the instrument's utility.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"3 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":"129561523","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.1978.332638
R. C. M. Phedran, L. Botten, P. Bliek, R. Deleuil, D. Maystre
We present a rigorous theory for the diffraction by inductive grids, having circular apertures placed in doubly-periodic fashion in a thick, perfectly-conducting screen. We compare the theory with measurements made at millimetric wavelengths, both for normal incidence and off-axis (in the region of strong polarization effects). We discuss the conclusions to be drawn from the calculations and measurements on the use of such grids as low-pass filters, particularly in relation to their possible application in the field of solar energy.
{"title":"Theoretical and Experimental Studies of Inductive Grids","authors":"R. C. M. Phedran, L. Botten, P. Bliek, R. Deleuil, D. Maystre","doi":"10.1109/EUMA.1978.332638","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332638","url":null,"abstract":"We present a rigorous theory for the diffraction by inductive grids, having circular apertures placed in doubly-periodic fashion in a thick, perfectly-conducting screen. We compare the theory with measurements made at millimetric wavelengths, both for normal incidence and off-axis (in the region of strong polarization effects). We discuss the conclusions to be drawn from the calculations and measurements on the use of such grids as low-pass filters, particularly in relation to their possible application in the field of solar energy.","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":"128878021","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.1978.332560
B. Schonwald
Angular measurements of brightness temperature in the frequency range between 50 GHz and 70 GHz reproduce information of the vertical temperature profile in the atmosphere. It will be measured with two radiometers. One works in the frequency range of 58 GHz and includes the lower 700 meters height (null-balancing Dicke receiver). The second works in the frequency range of 54.5 GHz (Dicke receiver using gain modulation for balancing) and includes the lower 1500 meters height. Both radiometers with their different techniques are compared to stability, noise and sensitivity. It is given a short review of two mathematical methods for determining the temperature profile out of radiation measurements.
{"title":"Application of Two Ground-Based Microwave Radiometers for Indirect Determination of the Temperature Profile of the Atmospheric Boundary Layer","authors":"B. Schonwald","doi":"10.1109/EUMA.1978.332560","DOIUrl":"https://doi.org/10.1109/EUMA.1978.332560","url":null,"abstract":"Angular measurements of brightness temperature in the frequency range between 50 GHz and 70 GHz reproduce information of the vertical temperature profile in the atmosphere. It will be measured with two radiometers. One works in the frequency range of 58 GHz and includes the lower 700 meters height (null-balancing Dicke receiver). The second works in the frequency range of 54.5 GHz (Dicke receiver using gain modulation for balancing) and includes the lower 1500 meters height. Both radiometers with their different techniques are compared to stability, noise and sensitivity. It is given a short review of two mathematical methods for determining the temperature profile out of radiation measurements.","PeriodicalId":429268,"journal":{"name":"1978 8th European Microwave Conference","volume":"47 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":"121771924","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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