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IEEE Transactions on Microwave Theory and Techniques

Issue 11 • Nov. 1981

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  • [Front cover - Nov. 1981]

    Publication Year: 1981, Page(s):f1 - f2
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    Freely Available from IEEE
  • Patent abstracts

    Publication Year: 1981, Page(s):1244 - 1247
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    These patent abstracts of recently issued patents of interest to microwave engineers are intended to provide the minimum information necessary for readers to detennine if they are interested in examining the patent in more detail. Complete copies of patents are available for a small fee by writing: U.S. Patent and Trademark Office, Box 9, Washington, DC, USA. View full abstract»

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  • Announcing A Second Special Issue On Guided Wave Technology To Be Published In The IEEE Journal Of Quantum Electronics And In The IEEE Transactions On Microwave Theory Techniques

    Publication Year: 1981, Page(s): 1248
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    Freely Available from IEEE
  • [Back Cover - Nov. 1981]

    Publication Year: 1981, Page(s): b1
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    Freely Available from IEEE
  • Investigations of Broad-Band, Linear Phase Shifters Using Optimum Varactor Diode Doping Profiles

    Publication Year: 1981, Page(s):1158 - 1164
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    The problem of obtaining linear phase shift of microwave signals over a broad frequency range and its dependence on varactor properties is addressed. An important application of the linear phase shifter, the microwave frequency translator, is investigated in detail and various circuit configurations and varactor doping profiles are examined relative to their performance including suppression of un... View full abstract»

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  • The Thermal Dielectric Quotient for Characterizing Dielectric Heat Conductors

    Publication Year: 1981, Page(s):1231 - 1233
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    If a piece of dielectric is mounted between two conductors, the resulting thermal conductance and electrical capacitance are related by their quotient which is a property of the material, independent of the size and shape. This quotient is expressed in watts per (picofarad X kelvin). It is helpful in the selection of a material for conducting heat while adding least capacitance. For example, a ber... View full abstract»

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  • 94-GHz Beam-Lead Balanced Mixer

    Publication Year: 1981, Page(s):1150 - 1157
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1104 KB)

    Using a newly developed GaAs beam-lead diode, we have developed and evaluated a balanced mixer at 94 GHz. The various components of the mixer were separately optimized using carefully designed low-frequency model studies as our primary design aid. These studies included the determination of guide impedance and guide wavelength for suspended stripline, and optimization of a waveguide to suspended s... View full abstract»

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  • Probing Amplitude, Phase, and Polarization of Microwave Field Distributions in Real Time

    Publication Year: 1981, Page(s):1225 - 1231
    Cited by:  Papers (15)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    A coherent (homodyne) detection system is used to map field distributions in real time. A key feature is the use of an electrically modulated (10-kHz) dipole scatterer which is also mechanically spun (150 Hz) to create an amplitude- and phase-modulated backscattered field. The system is monostatic. The backscattered field is coherently detected by mixing with the CW reference. A phase-insensitive ... View full abstract»

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  • A Laser-Induced Traveling-Wave Device for Generating Millimeter Waves

    Publication Year: 1981, Page(s):1174 - 1182
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    We have investigated a novel device concept for generating CW millimeter waves with output power in the multiwatt range. The concept involves the utilization of modulated laser radiation to induce in a distributed Schottky-diode structure a traveling-wave current which, in turn, synchronously excites the dominant mode of a waveguide structure to generate millimeter power. The induced traveling-wav... View full abstract»

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  • Corrections to "Design of Cylindrical Dielectric Resonators in Inhomogeneous Media"

    Publication Year: 1981, Page(s): 1243
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    In the above-referenced paper, the following corrections should be made. View full abstract»

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  • An Easy Tunable Stepped Coupled Lines Filter

    Publication Year: 1981, Page(s):1238 - 1240
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    A stripline bandpass filter setup consisting of two stepped coupled lines is presented, with special emphasis being given to practical realization. The theoretical design of the filter is based on the known synthesis of directional couplers and is outlined briefly. Practical setup of the filter, together with a simple tuning mechanism, is described in detail. Measurements performed show good agree... View full abstract»

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  • Analysis of Schottky-Barrier Millimetric Varactor Doublers

    Publication Year: 1981, Page(s):1145 - 1149
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    An analysis of abrupt-junction millimetric varactor doublers using Schottky diodes is performed and numerically implemented to evaluate conditions of maximum output power. This power level, the efficiency, and the circuit parameters have been derived as a function of the geometrical and physical parameters of the junction. Physical phenomena which allow the application of the model up to the plasm... View full abstract»

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  • Analysis of Miniature Electric Field Probes with Resistive Transmission Lines

    Publication Year: 1981, Page(s):1213 - 1224
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1248 KB)

    The miniature dipole probe is a useful tool for measuring the electric field at high radio and microwave frequencies. A common design for the probe consists of an electrically short dipole antenna with a diode across its terminals; a resistive, parallel-wire transmission line transmits the detected signal from the diode to the monitoring instrumentation. The high resistance per unit length of the ... View full abstract»

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  • Equivalent Reactance of a Shorting Septum in a Fin-Line: Theory and Experiment

    Publication Year: 1981, Page(s):1196 - 1202
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (960 KB)

    This paper presents the results of theoretical and experimental investigations of the equivalent reactance of a shorting septum in a fin-line. Numerical and experimental data showing septum reactance for several different fin-lines are presented and compared. Some design curves are included for millimeter-wave fin-lines with this type of discontinuity View full abstract»

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  • Synthesis of Transformer Coupled Multiple Frequency Circulators with Chebyshev Characteristics

    Publication Year: 1981, Page(s):1165 - 1173
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    This paper presents a theory for broad-band matching of stripline junction circulators for operation in two or more frequency bands. In this theory it is assumed that the matching network is composed of cascaded transmission line transformers each of which is an odd multiple of a quarter-wavelength at the center frequencies. The conditions for simultaneous Chebyshev response in multiple frequency ... View full abstract»

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  • Planar Broad-Band 180° Hybrid Power Divider/Combiner Circuit

    Publication Year: 1981, Page(s):1233 - 1235
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    A planar broad-band 180° hybrid is presented. The hybrid is realized using a 3-dB 90° hybrid and a 0-dB 90° tandem hybrid. An interdigitated version of the hybrid fabricated on alumina substrate performed well over the 4-8-GHz band. The hybrid has an insertion loss of 0.5 dB, phase imbalance of +-7°, and an isolation of better than 18 dB over the band. View full abstract»

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  • A Method for Diminishing Total Transmission Losses in Curved Dielectric Optical Waveguides

    Publication Year: 1981, Page(s):1182 - 1187
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    A practical method for diminishing total transmission losses in curved dielectric optical slab waveguides is proposed. Asymmetric structures are introduced into curved sections. It is found that there exists an optimum asymmetric structure for the curved section which makes the total transmission loss minimum. And it is also found that the characteristics of total transmission loss do not critical... View full abstract»

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  • Boundary Integral Equation Analysis of Transmission-Line Singularities

    Publication Year: 1981, Page(s):1240 - 1243
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The TEM line analysis of microstrips and coaxial lines generally involves boundary singularities which cause slow convergence of solutions computed by standard numencal techniques. In this study, the singularities occurring at the ends of the inner conductor in an unsymmetric closed microstrip containing a dielectric substrate, are treated by a modified boundary integral equation method. This meth... View full abstract»

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  • Energy Absorption from Small Radiating Coaxial Probes in Lossy Media

    Publication Year: 1981, Page(s):1202 - 1209
    Cited by:  Papers (12)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB)

    This paper describes the calculation of energy deposition around small open-ended coaxial antenna probes in lossy media. Two theoretical methods, a small monopole approximation (I) and an equivalent magnetic current source (II), are evaluated and compared. Method I is shown to be inappropriate for determining near field energy deposition. Power contour plots determined by method II in the vicinity... View full abstract»

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  • An Empirical Relationship for Electromagnetic Energy Absorption in Man for Near-Field Exposure Conditions

    Publication Year: 1981, Page(s):1235 - 1238
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    An empircal relationship is presented for the whole-body-average electromagnetic energy absorption in a 180-cell block model of man for near-field exposure conditions. Consideration is restricted to near fields with P polarization (no component of E directed arm-to-arm) in which the magnitude of the incident electric field is maximum immediately in front of the abdominal region. A highlight of thi... View full abstract»

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  • Stability Analysis of Injection-Locked Oscillators in Their Fundamental Mode of Operation

    Publication Year: 1981, Page(s):1137 - 1144
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    Phase-lock stability of fundamental-wave injection-synchronized oscillators is investigated on the basis of a new time-domain approach. Starting from a quite general oscillator modeling and assuming single-frequency quasi-static operation, both exact and first-order approximate stability criteria are derived in a fully analytical form suitable for computer implementation. The examples worked out d... View full abstract»

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  • Nonradiative Dielectric Waveguide for Millimeter-Wave Integrated Circuits

    Publication Year: 1981, Page(s):1188 - 1192
    Cited by:  Papers (265)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    A nonradiative dielectric waveguide is proposed in which dielectic strips are sandwiched between two parallel metal plates separated by a distance smaller than half a wavelength. Though the structure is substantially the same as that of the H-guide, it is based on a quite different principle of operation. This dielectric guide is particularly applicable in millimeter-wave integrated circuits, sinc... View full abstract»

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  • Dielectric Loss in Biogenic Steroids at Microwave Frequencies

    Publication Year: 1981, Page(s):1209 - 1213
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    Dielectric loss in steroids has been measured in solid format 9.4 GHz and in nonaqueous solutions at 3.3 and 9.4 GHz. The method for solutions consists of measurement on standing-wave pattern in front of a column of liquid of varying length and concentration, contained in a short-circuited dielectric cell. Keeping the concentration within the limits of dilute solutions, dipole moment and relaxatio... View full abstract»

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  • Spurious Resonances in Asymmetrical Fin-Line Junctions

    Publication Year: 1981, Page(s):1193 - 1195
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    Spurious resonances which occur in asymmetrical fin-line junctions are investigated. The field distribution and the resonant frequency are computed using a field matching technique. Looking at the field distribution, methods for resonance suppression are discussed. View full abstract»

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The IEEE Transactions on Microwave Theory and Techniques focuses on that part of engineering and theory associated with microwave/millimeter-wave components, devices, circuits, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, and industrial, activities. Microwave theory and techniques relates to electromagnetic waves usually in the frequency region between a few MHz and a THz; other spectral regions and wave types are included within the scope of the Society whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design..

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