{"title":"Optical Interaction of Active Integrated Antennas","authors":"S. Kawasaki, T. Itoh","doi":"10.1109/EUMA.1994.337208","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337208","url":null,"abstract":"This paper describes research effort on optical control of active integrated antennas. First, the concept of active integrated antenna is described. Next, how optical techniques provide benefit to the implementation of the active integrated antennas and arrays. Several examples of optical control are presented. The first part is mainly for controlling the oscillation characteristics of the transmitting active integrated antennas. Some recent effort is included for an optical method useful for beam scanning type active integrated antenna arrays.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"71 S10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113959752","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":"Ring of Four Overlapped Microstrip Hybrid Couplers","authors":"W. Marczewski, T. Morawski","doi":"10.1109/EUMA.1994.337288","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337288","url":null,"abstract":"The ring of couplers known from Butler matrix, correlators and direction finding systems has been discussed in the paper. The ring of four hybrid couplers is a regular pattern of a fundamental eight-port forming a set of four output responses. The responses can be excited in two orthogonal modes. The eight port with ring of five hybrid couplers has been included as an extension of the basic ring of four couplers. The pentagonal ring enables four way distribution in three modes. All available modes have been discussed on the base of perfect scattering matrix. Both the rings were embodied using broadside coupled Overlapped Microstrip lines with PTFE substrates and were measured in frequency ranges 2-16GHz and 10-20GHz. The presented results prove existence of recognized modes in real imperfect embodiments within approximate bandwidth of an octave. The rings are devoted for widely meant analog signal processing.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"538 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113982861","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}
David Sanchez-Hemandez, Sukhdeep Singh, I. Robertson
{"title":"A Multilayer Active Microstrip Antenna Array using Silicon Bipolar Monolithic Amplifiers in a Spatial Power Combining Configuration","authors":"David Sanchez-Hemandez, Sukhdeep Singh, I. Robertson","doi":"10.1109/EUMA.1994.337365","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337365","url":null,"abstract":"Recently, a significant amount of research has concentrated on two or three terminal devices in spatial power combining structures. This paper presents a multilayer active microstrip antenna array in a spatial power combining technique by using silicon bipolar monolithic integrated circuits with high reliability. With the advantage of a multilayer structure, the radiation patterns from the antenna side are not affected by the radiation from circuit side, and the patterns are found to agree well with theory. An extra gain of 8.1 dB has been measured in comparison to the passive array, including the feed network loss compensation. This type of array can be built at low cost and, due to the excellent unit-to-unit uniformity of the MAR amplifier, it can be the ideal building block for large microstrip phased array systems. These structures have promising applications in mobile communications, non-invasive medical imaging and other systems where radiating structures are desirable.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121933133","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}
N. Suyazov, G. A. Lyakhov, K. F. Shipilov, E. A. Vinogradov
{"title":"Remote Sensing of Acoustic Signals and Perturbations Generated in Dense Medium","authors":"N. Suyazov, G. A. Lyakhov, K. F. Shipilov, E. A. Vinogradov","doi":"10.1109/EUMA.1994.337488","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337488","url":null,"abstract":"Distributed reflections of electromagnetic waves by running acoustic grating in two-layer medium have been considered as the new remote sensing methods for the registration of signals generated in dense medium. The theoretical analysis has been done for the application of this method to atmospheric reception of signal from underwater acoustic source. The effect of unsteady air-water interface irregularities due to wind waves has been examined. Calculations have shown that sufficiently intense acoustic signal can be received from deep ocean (down to kilometer) at a high altitude in atmosphere (up-to kilometers now and higher in future). The completed laboratory experiments have also confirmed the possibility of remote sensing registration of signal from underwater acoustic source. The reception of signal through interface (boundary surface) between different media has application on wide range of scales, from microscale (crystal lattice defect motion, for example) to geophysical one (ocean bottom layers detrusion or underwater volcano eruption, etc). In this situation the signal receiver is disposed in the other medium (usually in air) outside and often away from the dense medium where perturbation (or signal) source under examination is located. In dense conductive medium (such as metal, electrolyte, sea water) the optimal carrier of signal or information about perturbation is the acoustic waves. However acoustic waves attenuate drastically in transiting the interface and relatively soon decay when propagate in air. Therefore immediate registration of such acoustic waves away from the interface is impossible in many cases (particularly in high frequency range).","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117141762","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}
D. Le Berre, A. Pérennec, N. Julien, S. Toutain, R. Lefevre, D. Lemaillet, R. Soares
{"title":"Broad-Band Laser Circuit Command Design for Antenna Deport","authors":"D. Le Berre, A. Pérennec, N. Julien, S. Toutain, R. Lefevre, D. Lemaillet, R. Soares","doi":"10.1109/EUMA.1994.337420","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337420","url":null,"abstract":"The fiequency response of a LASER diode generally presents an electrooptic resonance. The amplitude and the frequency resonance vary with the bias current. In view to improve the LASER response, we present an original method for LASER command circuit design. It can also be applied to a differential amplifier comprising the synthesis of an active load as well as a one stage amplifier. The synthesis, carried out. witH lumped elements, markes no a priori assumptions about network topology, and an illustration is shown for an antenna deport application in the 10.7 - 14.5 GHz bandwidth using an HEMT transistor.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115209876","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 Concepts of Microwave Circuits Operating at Increased Temperatures","authors":"H. Hartnagel","doi":"10.1109/EUMA.1994.337201","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337201","url":null,"abstract":"Microwave Circuits can operate with relatively wide-bandgap compound semiconductor materials. The possibilities are reviewed, particularly also in connection with sensing applications, and the experimental results are presented.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"177 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123516044","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}
I. Huynen, B. Stockbroeckx, G. Verstraeten, D. Vanhoenacker, A. Vander Vorst
{"title":"Planar Gyrotropic Devices Analyzed by using a Variational Principle","authors":"I. Huynen, B. Stockbroeckx, G. Verstraeten, D. Vanhoenacker, A. Vander Vorst","doi":"10.1109/EUMA.1994.337226","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337226","url":null,"abstract":"This paper presents results obtained with a new explicit variational principle developed by the authors for planar multilayered gyrotropic structures. It is applied here to planar YIG films coupled to planar lines, used as resonators in Yig Tuned Oscillators. Under- and overcoupled topologies are modelled. The calculation of YIG Magnetostatic Wave resonators as equivalent resonant transmission lines agree very well with measurements carried out up to 20 GHz.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115212694","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 loss power splitter for antenna beam forming networks using probes in a waveguide","authors":"Mikael Mortensen Dich, Mette Dahl","doi":"10.1109/EUMA.1994.337479","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337479","url":null,"abstract":"The design of a low loss one-to-four power splitter suitable for beam forming networks in antenna arrays is presented. The power splitter is constructed of a shorted waveguide in which five coaxial probes are inserted. Methods for the design of the power splitter are presented together with an experimental verification.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115540432","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 Low-Intermodulation GaAs Mixers with Negative Feedback","authors":"K. Onodera, M. Muraguchi","doi":"10.1109/EUMA.1994.337283","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337283","url":null,"abstract":"A novel circuit configuration for GaAs FET mixers is proposed. An RC negative feedback technique on the drain LO injection GaAs FET mixer brings about substantial improvement in the 3rd-order intermodulation distortion property without conversion gain falloff. This effect is still more remarkable with higher LO power at the drain. Measured performance of a fabricated 1.9-GHz-band MMIC GaAs FET mixer shows more than an 8-dB improvement in the 3rd-order intermodulation intercept point over a conventional GaAs FET mixer with increased conversion gain.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115712491","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":"8-12GHz VCO with SiGe Heterojunction Bipolar Transistor","authors":"A. Gruhle, H. Kibbel, R. Speck","doi":"10.1109/EUMA.1994.337284","DOIUrl":"https://doi.org/10.1109/EUMA.1994.337284","url":null,"abstract":"A hybrid 8-12 GHz VCO has been built using a SiGe heterojunction bipolar transistor (HBT) in common-emitter-configuration. In order to achieve the wide frequency range only lumped elements were used. Transistors and varactors were fabricated on the same high-resistivity substrate using the same MBE-grown layers. The chosen doping profile resulted in a linear dependence of the output frequency on the varactor voltage.","PeriodicalId":440371,"journal":{"name":"1994 24th European Microwave Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123386459","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}