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Microwave Conference, 1989. 19th European

Date 4-7 Sept. 1989

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Displaying Results 1 - 25 of 195
  • Contents

    Publication Year: 1989, Page(s):nil1 - nil42
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    Freely Available from IEEE
  • MIMIC-An Opportunity that Must not be Missed

    Publication Year: 1989, Page(s):3 - 12
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (8727 KB)

    The Microwave and Millimeter Wave Monolithic Integrated Circuits (MIMIC) program, sponsored by the United States Department of Defense (DoD), provides the resources and structure that will make it possible to transition the results of many years of productive research and development in gallium arsenide technology into a manufacturable production process. This will allow the efficient and affordab... View full abstract»

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  • Review of Millimeter Standards and New Trends in Procedures of Six-Port Reflectometer

    Publication Year: 1989, Page(s):13 - 16
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    First, brief a review of the millimeter standards, power-attenuation-noise and reflection coefficient, in use in the main national laboratories is made. Then a description of the six port reflectometers realized or under realization is performed. The main calibration procedures from the old ones, standards, to the most recent, TRL method, are compared. Finally the main calibration procedure are pr... View full abstract»

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  • Achievements and Prospects of Microwave Distributed Amplifiers

    Publication Year: 1989, Page(s):17 - 28
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (12742 KB)

    A very successful example of Microwave Monolithic Integrated Circuits is the Distributed Amplifier (D.A.). It employs a number of amplifying elements positioned periodically between input and output transmission lines. The device parasitics, normally matched using conventional filter techniques, become then part of an artificial transmission line. Using this approach, monolithic broadband amplifie... View full abstract»

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  • Satellite Television: The Challenges of a Microwave Mass-Market

    Publication Year: 1989, Page(s):29 - 38
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (10812 KB)

    Television broadcasting direct to the home by satellite brings the first prospect of a real mass-production market for microwave electronic equipment. The paper outlines the satellite broadcasting systems coming into operation and then concentrates on the challenges posed in the design and implementation of the microwave hardware in the domestic receiver. The prospects for the more advanced techno... View full abstract»

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  • Antennas for Satellite Systems

    Publication Year: 1989, Page(s):39 - 54
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (17456 KB)

    The paper begins with a review of satellite systems for communications and broadcast and briefly alludes to the significant scientific space programmes which act as a technology driver for the industry. Progress in satellite antennas is considered under the headings array-fed reflectors and shaped-reflectors. It is in the second area that progress is most rapid with the potential for some national... View full abstract»

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  • Phased Array Radar and the Detection of Low Cross Section Targets

    Publication Year: 1989, Page(s):55 - 65
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    The reduction in the radar cross section of military targets has been widely reported. In this paper the implications with regard to phased array radar are examined. The benefits of phased array radar are outlined and it is shown that this form of radar makes the optimum use of power and aperture and is an increasingly attractive approach for the detection of small targets. The possibilities for t... View full abstract»

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  • Recent Trends in Gigabit Logic

    Publication Year: 1989, Page(s):66 - 71
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4828 KB)

    In the past years, GaAs has clearly demonstrated its potential to perform very high speed digital signal processing functions. Today, GaAs has entered the high speed ASIC arena and is able to seriously challenge Si ECL both in terms of performance and price. New applications push for still higher levels of integration and lower prices. In this paper, current GaAs MESFET performances are compared t... View full abstract»

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  • The Future Symbiosis of Optical Fibre and Microwave Radio Systems

    Publication Year: 1989, Page(s):72 - 86
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    Many of the time-honoured techniques developed during the sixty-year history of microwaves are now being adopted for optical fibre applications. Until comparatively recently, optical systems were more akin to the early wireless spark transmitters rather than the now sophisticated and ubiquitous radio systems. However, with the advent of coherent optics and photonic amplifiers based on semiconducto... View full abstract»

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  • Strategies for Microwave and Millimeter Wave Packaging Today

    Publication Year: 1989, Page(s):89 - 95
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4997 KB)

    Microwave and millimeter wave package requirements differ considerably from those for low frequency applications. Microwave packages are characterized by a low lead count (usually less than 20), with high lead-lead isolation, and controlled transmission line impedance levels. Packages normally are embedded in a 50 Ohm impedance environment. At microwave frequencies, performance is significantly mo... View full abstract»

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  • Recent Microwave Applications to Radar in the U.S.

    Publication Year: 1989, Page(s):96 - 106
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (11577 KB)

    Microwave hardware developments from several major companies and government laboratories are described that have applications in radar systems currently being developed in the United States. Major trends are evident in the evolution of solid state active array components and integration of multifunctions in a common aperture for ground, airborne and space based tracking and surveillance systems. View full abstract»

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  • GaAs Mesfets and Related Monolithic Structures as Broadband Microwave Control Devices

    Publication Year: 1989, Page(s):107 - 116
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (8300 KB)

    GaAs MESFETs are becoming more widely used in control components such as switches, phase shifters and variable attenuators. In this review GaAs MESFET control devices are compared with Si PIN diodes, with an emphasis on device and technology capabilities. Models of the low power switching performance of conventional recess gate MESFETs will be presented, emphasizing the dependence of equivalent ci... View full abstract»

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  • Superconductivity and its Application

    Publication Year: 1989, Page(s):119 - 127
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    This paper surveys the current work in superconductor electronics in Japan. The main purpose of the paper will be to review the application activities in analog and digital signal-processing circuits, magnetic sensors, voltage standards, samplers, and microwave and millimeter-wave receiver components, in both low Tc and high Tc superconductivity. View full abstract»

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  • Radio Astronomy in Millimetre Waves and Beyond ----- Nobeyama Radio Observatory and its Receiver Development

    Publication Year: 1989, Page(s):128 - 135
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    Nobeyama Radio Observatory has contributed to the recent progress of millimetre wave astronomy with the 45-m telescope and the millimetre array. High spatial resolution realized by these two telescopes has revealed detailed structure of the star forming regions and gas distribution in the external galaxies. The SIS mixer developed on the Nb/AlOx/Nb junction technology has been used in these telesc... View full abstract»

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  • Microwave Heterojunction Devices

    Publication Year: 1989, Page(s):136 - 146
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (9078 KB)

    High quality heterostructures, especially of compound semiconductors have realized superior performance microwave and millimeterwave devices to GaAs MESFETs. Activities on such heterojunction devices in Japan are reviewed and discussed. The works on modulation-doped heterostructure devices, hetero MISFETs, hetero junction bipolar transistors(HBTs) and quantum effect devices are presented. View full abstract»

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  • Dual Polarised Microstrip Antenna Design for a Polarisation Shift Keying Microwave Transponder

    Publication Year: 1989, Page(s):149 - 154
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3664 KB)

    This work describes a novel method of data transmission by means of polarisation shift keying. It analyses the system performance in terms of S/N ratio and defines the required antenna cross polarisation performance to achieve an acceptable S/N ratio. A theoretical analysis of antenna cross polarisation performance is provided. This analysis predicts a dependence of cross polarisation upon antenna... View full abstract»

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  • Simple Feedingtechnology for Stacked Microstrip Antennas

    Publication Year: 1989, Page(s):155 - 160
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3228 KB)

    Simple feeding systems have been developed for the excitation of stacked microstrip antennas. Stacked microstrip antennas give a good chance to increase the bandwidth of patch antennas or to use them for multiple frequencies. Some research /1/,/2/ has been carried out on the calculation of stacked microstrip antennas, but only idealised feeding models have been used in the calculation. For this re... View full abstract»

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  • Radiation Properties of Circularly Polarised Triplate-Type Planar Antenna

    Publication Year: 1989, Page(s):161 - 166
    Cited by:  Papers (2)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4717 KB)

    This paper presents the designing techniques and radiation properties of circularly polarised SHF planar arrays composed of triplate-type planar antennas (TPA). In order to verify the performance of this type of array, some test samples were fabricated and tested at the SHF-band. View full abstract»

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  • Impedance Measurements and Calculations of a Microstrip-Fed Slot Antenna on a Multilayered Electrically Thick Dielectric Substrate

    Publication Year: 1989, Page(s):167 - 171
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4150 KB)

    This paper presents impedance calculations and measurements of a microstrip-fed slot antenna fabricated on a layered dielectric substrate as shown in Figure 1. This structure could be very useful for fabricating imaging array antenna structures for high millimeter wave frequencies because it allows the antenna array to be fabricated on a substrate that can be electrically thick. The radiation prop... View full abstract»

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  • A Microstrip Based Active Antenna Doppler Transceiver Module

    Publication Year: 1989, Page(s):172 - 175
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3236 KB)

    We present the design and test of a microstrip active transceiver element suitable for use as a CW Doppler module. The circuit consists of a microstrip annulus from which a small section has been removed, resulting in a two-port antenna. This antenna is then coupled to the drains of two FETs through a short section of microstrip line. By adjusting the length of this section of line, the oscillatio... View full abstract»

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  • Generalized Modeling of GaAs Mesfets and Modfets Based on Highly Accurate Broadband Measurements

    Publication Year: 1989, Page(s):179 - 186
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7039 KB)

    A recently defined THLR method for vector network analyzer calibration is used to extract the error-parameters of coax to microstrip transitions with an accuracy hitherto unattained. The scattering coefficients of GaAs FETs such as MESFETs and MODFETs, installed in hybrid technology, are measured and error-corrected up to 40 GHz. A new parameter extraction method is discussed to get reliable bias-... View full abstract»

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  • Analysis of MMIC Components Including the Effect of Finite Metalisation Thickness

    Publication Year: 1989, Page(s):187 - 192
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4778 KB)

    The vast majority of published analyses of microstrip circuits have made the approximation that the strip is infinitely thin. Modern Microwave Monolithic Integrated Circuits (MMIC's) may, however, contain components whose strip thickness are of the order of 30% of the strip width. In this paper the Finite Difference Time Domain (FDTD) technique, combined with a knowledge of the assymptotic field b... View full abstract»

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  • Modeling Coupled Lossy Lines for Time Domain CAD of Circuits

    Publication Year: 1989, Page(s):193 - 198
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4322 KB)

    A model of a bus of lossy coupled microstrip transmission lines is developped for direct time domain simulation on IC chips or cards at a low computational cost. It adresses to ohmic losses and lines of equal width and spacing. It is validated using experimental measurements on two and three coupled line buses on a semi insulating GaAs substrate in a worst case of strong ohmic losses. View full abstract»

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  • Novel Green's Function Database Technique for the Efficient Full-Wave Analysis of Complex Irregular (M)MIC-Structures

    Publication Year: 1989, Page(s):199 - 204
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5620 KB)

    An efficient analysis of arbitrarily shaped shielded microstrip circuits using a new spatial Green's function database technique is presented. Generation of the associated large moment method matrix equations is reduced to a few simple operations per element. The speed advantage of direct databased solutions is discussed and compared to a spectral domain conjugate gradient solver. The accuracy of ... View full abstract»

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  • Combined Discrete/Normal Statistical Modeling of Microwave Devices

    Publication Year: 1989, Page(s):205 - 210
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4949 KB)

    This paper deals with statistical characterization of the equivalent circuit parameters for microwave FET devices. The statistics are derived from the S-parameters measured for a sample of devices. The use of a multidimensional normal distribution seems justified for most parameters. For parameters exhibiting sample distributions substantially different from normal we propose a combined discrete/n... View full abstract»

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