{"title":"Quartz Microstrip Radial Disk Fundamental and Second Harmonic mmW Gunn Oscillators","authors":"J. Ondria","doi":"10.1109/EUMA.1988.333840","DOIUrl":"https://doi.org/10.1109/EUMA.1988.333840","url":null,"abstract":"Microstripline Gunn oscillators have been successfully constructed up through the W-Band (75 - 110 GHz) region employing soft substrate materials. Most designs employ low Q resonators which yield correspondingly poor stability and noise. A new design which exploits the inherently high Q of a radial disk geometry has been successfuly realized in quartz microstrip medium. A GaAs fundamental mode radial disk design has delivered 150 mW output power in the upper Ka-Band (26.5 - 40 GHz) region with essentially no optimization thus far. The fm noise to carrier ratio was better than -89 dBc/Hz at 100 kHz offset frequency. A second harmonic design, which operates fundamentally in Q-Band (33 - 50 GHz), produced approximately 0.5 mW at W-Band (75 - 110 GHz) with an fm noise to carrier ratio better than -80 dBc/Hz at 100 kHz offset. An InP fundamental mode microstrip design operating in W-Band (75 - 110 GHz) produced 15 mW at 94 GHz. A similar design with tighter coupling exhibits an electronic tuning range of 2.2 GHz (centered at 96.6 GHz) with bias pushing, and a power output between 5 mW (min.) and 8.8 mW (max.) over this bandwidth. One circuit was scaled to 101 GHz and produced 4.4 mW with an fm noise to carrier ratio of -79.3 dBc/Hz at 100 kHz offset with a measured loaded QL of 420. Varactor tuning designs are presented for both parallel and series geometries in quartz based microstrip medium.","PeriodicalId":161582,"journal":{"name":"1988 18th European Microwave Conference","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131779266","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":"Plane Wave Diffraction by a Resistive Slab Recessed in an Impedance Surface","authors":"A. Serbest, G. Uzgoren, A. Buyukaksoy","doi":"10.1109/EUMA.1988.333961","DOIUrl":"https://doi.org/10.1109/EUMA.1988.333961","url":null,"abstract":"The analysis of the radiation from dielectric covered slot arrays is an interesting topic for practical applications. In this paper, the diffraction of a plane wave by a dielectric covered slot in an infinite impedance plane is considered as a canonical problem for slot array configuration, where the analysis is confined to the doubly diffracted rays. A traditional approach for evaluating this type of ray fields is to repeteadly employ the edge diffraction coefficient with the incident field being the one diffracted from the previous edge. Our analysis depends on the Fourier transform technique which requires the solution of a modified Wiener-Hopf equation. This problem is reduced to a system of Fredholm equation of the second kind and solved by the successive approximations technique.","PeriodicalId":161582,"journal":{"name":"1988 18th European Microwave Conference","volume":"207 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132823128","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":"The Design of Low Noise Feedback Amplifiers with Simultaneous Input Power Match and Noise Optimization","authors":"A. Teale, M. Howes, J. Richardson","doi":"10.1109/EUMA.1988.333869","DOIUrl":"https://doi.org/10.1109/EUMA.1988.333869","url":null,"abstract":"The 3-Port Scattering and Noise parameters of a GaAsFET are measured. The noise measurement method is novel and is verified by good agreement between the measured 3-Port Noise parameters of a passive network and predicted noise parameters calculated from its 3-Port S-Parameters. Circuit theory is presented for calculating the Scattering and Noise parameters of a 3-Port transistor embedded in a passive network. The circuit is represented by a signal flow graph containing partially-correlated stationary random noise sources. An algorithm is presented which uses the measured transistor data and the circuit analysis technique to design amplifiers with simultaneous input power match and optimum noise figure. Such amplifiers do not use isolators or a balanced configuration and hence are more amenable to economic MMIC implementation. The procedure is illustrated using the example of a circuit consisting of a transistor, a lossless series feedback inductor and a lossless parallel feedback capacitor.","PeriodicalId":161582,"journal":{"name":"1988 18th European Microwave Conference","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116756001","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":"Very Small and Light Ku-Band Low Noise Converter with Low Noise FET Mixer","authors":"T. Ohta, M. Miyazaki, Naoki Okamoto, Kaoru Okabe","doi":"10.1109/EUMA.1988.333854","DOIUrl":"https://doi.org/10.1109/EUMA.1988.333854","url":null,"abstract":"The very small sized and light weighted satellite receiving converter with excellent characteristics has been developed for the Ku-band. The very low noise FET mixer is newly developed and used for the converter. Because of the realization of the low noise FET mixer, the excellent characteristics of the converter with two-stage low noise amplifier which is composed of the HEMT and the FET are obtained. In addition, the special strip-line corner is developed and applied in order to make the converter size smaller. The characteristics of the converter with these technologies are the noise figure of 1.7dB max, the conversion gain of 55dB min and the image rejection ratio of 50db min. Total power consumption of the converter is 1.7w. The converter are particulary very small volume of 100cc and light weight of 180g.","PeriodicalId":161582,"journal":{"name":"1988 18th European Microwave Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125861408","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}
J. Konopka, R. Sobolewski, A. Konopka, S. Lewandowski, W. Kula
{"title":"Detection of Millimetre Wave Radiation by Y-Ba-Cu-O Thin Films at Liquid Nitrogen Temperatures","authors":"J. Konopka, R. Sobolewski, A. Konopka, S. Lewandowski, W. Kula","doi":"10.1109/EUMA.1988.333815","DOIUrl":"https://doi.org/10.1109/EUMA.1988.333815","url":null,"abstract":"Detecting properties of Y-Ba-Cu-O granular thin film structures obtained by two differnt technological methods and using three different substrate materials have been studied at millimetre waves. The response to 25 and 100 GHz radiation is presented as the function of dc bias current for several temperatures around 77 K. For power levels below saturation the amplitudes of the recovered video signals were found to be proportional to the incident power. Sensitiviy obtained at 110 GHz is comparable to that of crystal point-contact detector. Preliminary results on mixing of two Ku-band sources for IF frequencies up to 5 GHz are presented, indicating that the response time of Y-Ba-Cu-O films is shorter than 40 ps. Due to pronounced quantum effects, which manifest themselves especially in narrow superconducting strips below 60 K, at present state of the technology the usefulness of investigated detectors is limited to liquid nitrogen temperatures.","PeriodicalId":161582,"journal":{"name":"1988 18th European Microwave Conference","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121966332","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":"Analysis of Travelling-Wave Inverted-Gate Field-Effect Transistors","authors":"S. El-Ghazaly, T. Itoh","doi":"10.1109/EUMA.1988.333812","DOIUrl":"https://doi.org/10.1109/EUMA.1988.333812","url":null,"abstract":"A unified approach to the analysis the traveling-wave Inverted-Gate FET (INGFET) is presented. The equivalent circuit parameters of the GaAs Inverted-Gate FET, with submicron gate-length, is obtained using a two-dimensional computer model which takes into account the non-stationary electron dynamics. The parameters of the passive transmission line, corresponding to the INGFET, are obtained using a quasi-TEM wave approach. The conductor losses of this structure are estimated using the Incremental-Inductance Rule. The coupled mode theory is used to derive the wave equation describing this traveling-wave transistor. The results show the existence of a fast growing mode along the device electrodes. It is also shown that this mode can be excited alone by appropriate matching and feeding arrangements. Improper matching and feeding lead to a narrower bandwidth due to the resonance phenomenon of the resulting standing wave.","PeriodicalId":161582,"journal":{"name":"1988 18th European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130320697","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 High-Efficiency Flat Plate Array for Direct Broadcast Satellite Applications","authors":"R. Sorbello, A. Zaghloul, J. Effland, D. Difonzo","doi":"10.1109/EUMA.1988.333831","DOIUrl":"https://doi.org/10.1109/EUMA.1988.333831","url":null,"abstract":"The design and performance of a low-cost, lightweight, high-efficiency flat plate array for receive-only satellite applications are described. The design is based on work performed at COMSAT Laboratories that has led to the development of novel printed-circuit radiators for both linearly polarized and circularly polarized applications. The radiating elements are excited via electromagnetic coupling to the feed lines, thus avoiding costly interconnections and resulting in a design that is highly amenable to low-cost mass production. The design is being implemented in a joint COMSA T/Matsushita Electric Works venture which has resulted in the production of commercial flat plate antennas that are presently available in Japan and will soon be introduced in Europe. The performance of these antennas is comparable to that of a parabolic antenna and exceeds that achieved by any competing commercially available flat antenna design.","PeriodicalId":161582,"journal":{"name":"1988 18th European Microwave Conference","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127672564","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":"Error Corrected Microwave Voltage and Current Periodic Waveform Measurements","authors":"M. Sipila, K. Lehtinen, V. Porra","doi":"10.1109/EUMA.1988.333899","DOIUrl":"https://doi.org/10.1109/EUMA.1988.333899","url":null,"abstract":"A system is described to measure the periodic time domain voltages and currents of a nonlinear microwave device. A vector error correction algorithm is used to take into account and correct the errors caused by imperfect microwave hardware. The system can also be used to yield frequency domain quantities such as the fundamental frequency reflection coefficient. Measurement results for two microwave transistors are given.","PeriodicalId":161582,"journal":{"name":"1988 18th European Microwave Conference","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127602420","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":"Analysis of T-Junction in Square Coaxial Cable","authors":"F. Alessandri, R. Sorrentino","doi":"10.1109/EUMA.1988.333811","DOIUrl":"https://doi.org/10.1109/EUMA.1988.333811","url":null,"abstract":"A method of analysis of T-junction in square coaxial cable technology is presented. The method is based on a generalization of the transverse resonance method already applied to discontinuities in mm-wave structures using a three dimensional modal expansion technique.","PeriodicalId":161582,"journal":{"name":"1988 18th European Microwave Conference","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117117738","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}
J. Buechler, E. Kasper, J. Luy, P. Russer, K. Strohm
{"title":"Planar W--Band Receiver and Oscillator","authors":"J. Buechler, E. Kasper, J. Luy, P. Russer, K. Strohm","doi":"10.1109/EUMA.1988.333841","DOIUrl":"https://doi.org/10.1109/EUMA.1988.333841","url":null,"abstract":"A planar oscillator integrated on silicon substrate with a double drift region IMP ATT diode and a monolithic integrated Schottky diode receiver including a planar antenna on one silicon chip for the 90 GHz band are presented. The maximum CW output power of the oscillator is 200 mW at 73 GHz with an efficiency of 4.5 %. The experimental receiver sensitivity is 65 μV/μWcm-2, the receiver antenna half--power beamwidth is 23°.","PeriodicalId":161582,"journal":{"name":"1988 18th European Microwave Conference","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131584224","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}