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1977 7th European Microwave Conference最新文献

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Application of the Isoparametric Finite-Element Method to Integral Equations 等参数有限元法在积分方程中的应用
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332380
G. Jeng, M. Lean, A. Wexler
{"title":"Application of the Isoparametric Finite-Element Method to Integral Equations","authors":"G. Jeng, M. Lean, A. Wexler","doi":"10.1109/EUMA.1977.332380","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332380","url":null,"abstract":"A refined numerical technique, based on a variational approach using isoparametric finite-elements is presented for the solution of three-dimensional electromagnetic scattering problems. This technique allows a higher-order approximation of the unknown function over a bounding surface described by non-planar elements. The Rayleigh-Ritz procedure is used to discretize the integral equation. Kernel singularities are treated by separating them from the main integral and solving them analytically. A procedure for establishing the system matrix in a block-sparse form will be described [5].","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131624929","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}
引用次数: 1
A GaAs FET Designed for Maximum Flexibility in Electrical Performance 为电气性能的最大灵活性设计的GaAs场效应管
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332408
M. Bujatti, M. Massani
{"title":"A GaAs FET Designed for Maximum Flexibility in Electrical Performance","authors":"M. Bujatti, M. Massani","doi":"10.1109/EUMA.1977.332408","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332408","url":null,"abstract":"A simple process has been developped which enables us to produce GaAs FET's with enough flexibility in the geometry to adjust for a wide range of circuits requirements. In order to gain control on the active layer we used ion implantation on semi-insulating substrates. Results obtained an epitaxial and implanted layers are compared. Power output and S parameters are measured as a function of the gate width.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121759415","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}
引用次数: 0
Modified Commutating Networks for Multiplexing in Transmit and Receiving Applications 在发送和接收应用中用于多路复用的改进的交换网络
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332422
M. Adams, C. S. Barham, I. Powell, B. Watson
{"title":"Modified Commutating Networks for Multiplexing in Transmit and Receiving Applications","authors":"M. Adams, C. S. Barham, I. Powell, B. Watson","doi":"10.1109/EUMA.1977.332422","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332422","url":null,"abstract":"The response of the simple line length diplexer can be significantly improved by the addition of two all-pass networks. Using pairs of short-circuited standard waveguides, flat equally-spaced passbands with narrow guard bands can be realised. A further modification involving pairs of tapered waveguides provides a method of varying the channel widths and spacings. An example is given of the former for use in a twelve-channel satellite ground station, while current theoretical and experimental work is directed towards Intelsat V requirements.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132906016","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}
引用次数: 0
Recent Advances in Solid State Microwave Devices 固态微波器件的最新进展
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332388
G. Gibbons
{"title":"Recent Advances in Solid State Microwave Devices","authors":"G. Gibbons","doi":"10.1109/EUMA.1977.332388","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332388","url":null,"abstract":"In this paper recent advances in three areas of microwave solid state devices will be discussed, namely GaAs FETs, InP TEDs and Si TRAPATTs. A common factor in advancing the performance capability and yields of these devices has been improvements in materials technology. GaAs FET noise figures below 1.5 dB are now achievable in X band and power levels approaching 1 watt have been obtained from multicell devices in the same frequency range. Efficiency improvements in transferred electron oscillators have resulted from an understanding of the role of the cathode contact and the reproducible fabrication of two-zone cathode structures in InP. Extension of Si TRAPATTS technology into X band has led to the development of high efficiency, high power devices well-suited to pulsed oscillator and amplifier applications. Developments in materials and device technology which have led to these advances will be discussed.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132913501","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}
引用次数: 0
Design and Application of Special Microwave Interferometers for Non-Invasive Studies of Biological Effects 非侵入性生物效应研究专用微波干涉仪的设计与应用
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332382
D. Griffin
{"title":"Design and Application of Special Microwave Interferometers for Non-Invasive Studies of Biological Effects","authors":"D. Griffin","doi":"10.1109/EUMA.1977.332382","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332382","url":null,"abstract":"Special microwave interferometers have been designed to make non-contact measurements of the movements associated with various physiological functions such as respiration, pulse, muscle action, reflexes, involuntary tremors, etc. For each interferometer the factors affecting resolution across a large moving surface, sensitivity to small amplitude displacement and maintenance of calibration have been studied and accurate direct measurement of surface displacement has been achieved with very low incident microwave power levels. Interferometers based on three port circulators are most sensitive but those based on magic tee hybrids are easier to operate. Movement of the chest, hands, legs and eyeball have been studied and potential for accurate correlation with EEG, ECG, or EMG records are evident.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133117273","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}
引用次数: 1
Design of Linear Gaas FET Amplifiers 线性Gaas FET放大器的设计
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332411
W. Kelly, J.G. de Koning, J. Monroe, H. Tokuda
{"title":"Design of Linear Gaas FET Amplifiers","authors":"W. Kelly, J.G. de Koning, J. Monroe, H. Tokuda","doi":"10.1109/EUMA.1977.332411","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332411","url":null,"abstract":"A newly developed technique is described for maximizing one dB compression output power of a microwave amplifier across practical bandwidths. Gain compression characteristics at X-band of a packaged GaAs FET are presented. A single stage design example is presented, and performance of a 100 mW, three-stage, 9 GHz to 10 GHz amplifier is described.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123943221","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}
引用次数: 3
On the Measurement of Microstrip Discontinuity Scattering Matrices by a Resonance Technique 用共振技术测量微带不连续散射矩阵
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332414
P. Bernardi, F. Bertolani, Vittorio Rizzolim
{"title":"On the Measurement of Microstrip Discontinuity Scattering Matrices by a Resonance Technique","authors":"P. Bernardi, F. Bertolani, Vittorio Rizzolim","doi":"10.1109/EUMA.1977.332414","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332414","url":null,"abstract":"A new simple solution to the problem of experimentally characterizing the behaviour of symmetrical microstrip discontinuities is presented. To perform the measurement, a resonant cavity consisting of a couple of identical microstrip sections connected by the discontinuity to be tested is built, together with a reference circuit made of a length of uniform transmission line. The resonant frequencies of the test and reference device are then measured as accurately as possible, and the scattering parameters of the discontinuity are related to these frequencies by means of very simple, explicit formulae.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129819721","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}
引用次数: 1
Local Oscillator for Microwave Radio Link Transceivers 微波无线电链路收发器的本地振荡器
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332457
E. Cottatellucci, M. Tosolini, G. Tosti
{"title":"Local Oscillator for Microwave Radio Link Transceivers","authors":"E. Cottatellucci, M. Tosolini, G. Tosti","doi":"10.1109/EUMA.1977.332457","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332457","url":null,"abstract":"This local oscillator uses a RF transistor generator with a frequency stability of 1% and reduced FM noise. The requested frequency stability of ±10.10-6 is achieved by locking the R.F. generator to a quartz oscillator by means of two sampling mixers and a zero frequency discriminator. The sampling rate is quartz controlled and lies in the range 180+190 MHz: the developped locking network covers the range 3,6+8,5 GHz. No filters and no multiplier (or divider) chains are used. The frequency error of the AFC loop remains within 0,2.10-6. The synchronizing method doesn't impaire frequency modulation characteristics of the RF oscillator.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130107830","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}
引用次数: 1
A Compact and Versatile 19 GHz Digital Radio Field Trial Equipment 一种紧凑、通用的19ghz数字无线电现场试验设备
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332441
L. Stagg, J. Robinson
{"title":"A Compact and Versatile 19 GHz Digital Radio Field Trial Equipment","authors":"L. Stagg, J. Robinson","doi":"10.1109/EUMA.1977.332441","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332441","url":null,"abstract":"A digital radio equipment operating at frequencies around 19 GHz is described. Designed for field trial applications it can be used in a variety of configurations, allowing trials of multichannel telecommunications systems and mobile or fixed, digitally encoded television outside broadcast links. Microwave integrated circuits are used extensively throughout the r.f. and i.f. sections of the equipment allowing the realisation of compact, easily handled modules. The equipment transmits 1 or 2 binary data streams, each having data rates up to 154 Mbit/s. Hop lengths up to 5 or 10 km are achievable, depending on the grade of service required.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129365136","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}
引用次数: 0
Some Recent Advancements in Hybrid MICs 混合mic的一些最新进展
1977 7th European Microwave Conference Pub Date : 1977-10-01 DOI: 10.1109/EUMA.1977.332465
P. Brigginshaw, N.M. Lancaster, G. R. Swallow, T. Oxley
{"title":"Some Recent Advancements in Hybrid MICs","authors":"P. Brigginshaw, N.M. Lancaster, G. R. Swallow, T. Oxley","doi":"10.1109/EUMA.1977.332465","DOIUrl":"https://doi.org/10.1109/EUMA.1977.332465","url":null,"abstract":"This paper describes some circuit design features of MIC sub-systems utilising hybrid-open microstrip techniques which give improved performance, particularly where military environments necessitate a wide operating temperature range and compactness is of prime importance. The design and performance of a J (Ku)-band radar duplexer-receiver MIC sub-system is described to illustrate the points of interest. Emphasis is placed on the influence of v.s.w.r. and isolation characteristics resulting from the performance of non-reciprocal circuit functions, microstrip launchers and the propagation of box modes, on the overall operation of the sub-system. Particular attention is given to the temperature characteristics of microstrip circulators, and novel techniques are described which compensate for the reversible temperature coefficient properties of the samarium-cobalt magnetic material used to bias the ferrite devices. Design features are also described which reduce degradation in circuit isolation due to radiation from the microsttrip and are compatible with small size and low weight requirements.","PeriodicalId":369354,"journal":{"name":"1977 7th European Microwave Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131478339","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}
引用次数: 0
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