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Microwave Theory and Techniques, IEEE Transactions on

Issue 10 • Date Oct. 1984

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Displaying Results 1 - 25 of 29
  • [Front cover - Oct. 1984 [T-MTT]]

    Publication Year: 1984 , Page(s): f1 - f2
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    Freely Available from IEEE
  • Technology Summaries for Microwave Theory and Techniques - 1983

    Publication Year: 1984 , Page(s): 1372 - 1378
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (916 KB)  

    This paper consists of compendia of advances for the calendar year 1983 in four selected technical areas of interest to the microwave community. These four areas are Hybrid MIC's, Microwave and Millimeter-Wave Solid-State Devices, Microwave Field Theory, and Microwave Systems. View full abstract»

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  • Patent abstracts

    Publication Year: 1984 , Page(s): 1422 - 1425
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    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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  • IEEE Conference Records [advertisement]

    Publication Year: 1984 , Page(s): 1426
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    Freely Available from IEEE
  • [Back cover - Oct. 1984 [T-MTT]]

    Publication Year: 1984 , Page(s): b1 - b2
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    Freely Available from IEEE
  • Modes in Anisotropic Rectangular Waveguides: An Accurate and Simple Perturbation Approach (Short Papers)

    Publication Year: 1984 , Page(s): 1415 - 1418
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (416 KB)  

    We present a simple and accurate perturbation method for obtaining the propagation characteristics of anisotropic rectangular waveguides described by a diagonal dielectric constant tensor. Comparison with the results of finite-element technique shows an excellent agreement. View full abstract»

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  • High-Temperature Microwave Characterization of Dielectric Rods

    Publication Year: 1984 , Page(s): 1328 - 1335
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (816 KB)  

    A technique for the simultaneous heating and characterization of dielectric rods using a single microwave source is described. The rod is heated in a rectangular cavity excited by an iris. A variational model for the impedances of homogeneous rods used in the characterization procedure is discussed. It is accurate regardless of the diameter of the rod, even at resonance. Experimental results of Beta-Al2O3 are presented. View full abstract»

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  • Stability of Multifrequency Negative-Resistance Oscillators

    Publication Year: 1984 , Page(s): 1310 - 1318
    Cited by:  Papers (4)
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    A general criterion is derived for the stablity of a negative-resistance oscillator with respect to small perturbations in the operating point. The derivation applies when the oscillator output consists of an arbitrary number of related frequency components, including possible nonharmonic components. Examples are given of the application of the stability criterion to coaxial IMPATT oscillator circuits, with experimental verification of the frequency and output power at theoretically determined stable operating points. View full abstract»

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  • Finite-Element Analysis of Dielectric-Loaded Waveguides

    Publication Year: 1984 , Page(s): 1275 - 1279
    Cited by:  Papers (42)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    A finite-element analysis in which nonphysical spurious solutions do not appear has been established to solve the electromagnetic field problem of the closed waveguide filled with various anisotropic media. This method is based on the approximate extremization of a functional, whose Euler equation is the three-component curlcurl equation derived from the Maxwell equations, with a new conforming element. Specific examples are given and the results are compared with those obtained by exact solutions and longitudinal two-component finite-element solutions. Very close agreement was found and all nonzero eigenvalues have been proved to have one-to-one correspondence to the propagating modes of the waveguide. View full abstract»

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  • Generation of High-Frequency Radiation by Quasi-Optical Gyrotron at Harmonics of the Cyclotron Frequency

    Publication Year: 1984 , Page(s): 1398 - 1401
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (472 KB)  

    A quasi-optical gyrotron can operate, in principle, at high harmonics of the electron-cyclotron frequency, as well as at the fundamental. Lower harmonics are suppressed by exploiting their larger diffraction losses. The radiation-field amplitude is kept below the breakdown value by taking advantage of the focusing properties of the quasi-optical resonator. Cavity design parameters and starting currents are presented which characterize the operation of the quasi-optical gyrotron at the eighth harmonic of gyrofrequency. View full abstract»

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  • Electromagnetic Waves in Toroidal Vessels of Arbitrary Cross Section Filled with Radially Inhomogeneous Dielectric Medium

    Publication Year: 1984 , Page(s): 1336 - 1341
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (536 KB)  

    In this paper, analytical solutions of Maxwell's equations in cylindrical coordinates are presented for toroidal resonators filled with homogeneous or inhomogeneous unmagnetized plasma or another dielectric medium. It is shown that the electromagnetic boundary conditions valid on a conducting toroidal surface of arbitrary meridional cross section can be satisfied by the general solution since the general solution contains an infinite set of arbitrary constants. A method is given to show how these constants and the eigenfrequency of the resonator can be calculated for a given cross section of the toroidal vessel. View full abstract»

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  • Scattering at a Junction of Two Waveguides with Different Surface Impedances

    Publication Year: 1984 , Page(s): 1319 - 1328
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1032 KB)  

    We consider junction of two cylindrical waveguides and derive the scattering matrix when a single mode is incident in one of the two waveguides. We are interested primarily in the case of two corrugated waveguides with different longitudinal impedances, but the analysis applies also to waveguides with nonzero transverse impedances. It is shown that, under certain general conditions the infinite set of equations specifying the junction scattering coefficients can be solved exactly by the residue-calculus method. Very simple expressions are then obtained between the scattering coefficients and the propagation constants gamman and yi of the modes in the two waveguides. These expressions, obtained previously only in special cases, are direct consequences of certain simple relations derived here for the coupling coefficients between the modes of the two waveguides. In those cases in which the scattering coefficients cannot be determined exactly, we determine them approximately by a perturbation analysis. View full abstract»

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  • A New Microstrip Dispersion Model (Short Papers)

    Publication Year: 1984 , Page(s): 1379 - 1384
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (584 KB)  

    A new unified analysis technique is presented for dispersion in microstrip at high frequencies. The technique exploits the fact that the dispersion in microstrips is due to coupling between a surface-wave mode and the LSE mode of an appropriate model of the microstrip. The analysis uses an effective dielectric constant (EDC) approach to evaluate the mode coupling in the LSE model. Unlike previously reported models, all the parameters of the model are exactly determined from the quasistatic parameters of the microstrip, which takes the fringing field into account. Approximate closed-form equations are derived for the prediction of microstrip dispersion. The results agree within 1.50 percent with the experimental and previously published data over a wide useful range of microstrip dimensions and substrate permittivities. View full abstract»

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  • Theory and Numerical Simulation of a TE111 Gyroresonant Accelerator

    Publication Year: 1984 , Page(s): 1293 - 1301
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (864 KB)  

    The production of spiral relativistic electron beams in a TE111 gyroresonant accelerator cavity for injection into a compact high-harmonic gyrotron is studied. Parametric studies are performed to determine the effects of variations in the background magnetic field amplitude, the RF amplitude in the cavity, and the initial beam voltage on the output beam.The effects of velocity spread and a finite radial extent of the input beam are also discussed. Power curves for obtaining optimum operating regimes for the TE /sub111/ accelerator are provided. View full abstract»

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  • Phase Shifts in Single- and Dual-Gate GaAs MESFET's for 2-4-GHz Quadrature Phase Shifters

    Publication Year: 1984 , Page(s): 1280 - 1288
    Cited by:  Papers (9)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (944 KB)  

    The variation of transmission phase for single- and dual-gate GaAs MESFET's with bias change and its probable effects on the performance of an active phase shifter have been studied for the frequency range 2 to 4 GHz. from measured S-parameter values for single- and dual-gate transistors, the element values of the equivalent circuits were fitted by using the computer-aided design program SUPER COMPACT. For the normal full-gate voltage range 0 to -2 V at VDS= 4 V, the single-gate MESFET varies in transmission phase from 142° to 149° at 2 GHz, and from 109° to 119° at 4 GHz. However, with drain voltage varied from 0.3 to 4 V and a constant gate-voltage bias of 0 V, the phase shifts are much larger, 105° to 145° at 2 GHz and 78° to 112° at 4 GHz. this suggests that large phase shifts may be expected in a dual-gate device and this is found to be so. With VDS= 4 Vand VGS1= - 1.0 V, variation of control (second) gate bias from 0 to - 1.75 V for the NE463 GaAs MESFET produces a transmission phase variation from 95° to 132° at 2 GHz and 41° to 88° at 4 GHz. Such phase shifts cause both amplitude and phase errors in phase-shifter circuits of the kind where signals from two FET channels are combined in quadrature with their gate voltages controlled to provide 0° to 90° phase control with constant amplitude. For the single-gate FET examined, the expected amplitude and phase errors are 0.30 dB and 6° at 2 GHz, and 0.36 dB and 10° at 4 GHz. If dual-gate FET's are used in similar circuits, the distribution of errors is different. For NE463 devices, the corresponding figures are 0.56 dB and 2° at 2 GHz and 1.2 dB and 3° at 4 GHz. the advantage of the dual-gate configuration is that the input impedance conditions are more constant than for the single-gate configuration. View full abstract»

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  • Effect of Inner Conductor Offset in a Coplanar Waveguide

    Publication Year: 1984 , Page(s): 1387 - 1390
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (400 KB)  

    This paper reports on the effect of structural offset in a coplanar waveguide on the characteristic impedance and fine loss. This effect can be an appreciable factor in designing highy precise circuits, such as MIC's using coplanar waveguide, or a coplanar-type standing-wave detector. The electric field over the cross section of the line is analyzed by assuming a TEM mode of wave propagation, and solving a two-dimensional Laplace's equation by means of the successive over-relaxation method. In the analysis, an approximate solution based on symmetry is employed. Also, measurements are made, to confirm the results thus obtained. View full abstract»

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  • Effect of Doping Profile Variation on GaAs Hybrid and Double-Read IMPATT Diode Performance at 60 and 94 GHz

    Publication Year: 1984 , Page(s): 1342 - 1352
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (808 KB)  

    Doping profile parameters were varied in a computer optimization of hybrid and double-read GaAs IMPATT diodes at 60 and 94 GHz. The energy-momentum transport model was used to simulate each structure. Optimum results for the various structures that were studied are presented and compared. View full abstract»

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  • Numerical Study of the Current Distribution on a Post in a Rectangular Waveguide (Short Papers)

    Publication Year: 1984 , Page(s): 1411 - 1415
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (496 KB)  

    A recently developed, rapidly converging moment solution for electromagnetic scattering by a single inductive post in a rectangular waveguide is extended to include the current induced on the past surface. The results are represented by a Fourier series and the first few terms are compared with available data. The excellent agreement demonstrates that this approach can yield an accurate solution. This rather simple procedure is even more attractive when other waveguide obstacles such as thick irises and posts of arbitrary shape, which require, in general, more than just a few Fourier terms for their current representation, are encountered. View full abstract»

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  • Analysis of Slotted, Dielectrically Loaded, Ridged Waveguide

    Publication Year: 1984 , Page(s): 1302 - 1310
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1040 KB)  

    This paper considers a symmetrical double-ridged waveguide with an axial dielectric slab inserted into it. Series expansions are used to describe the waveguide fields. The method of moments is employed to provide a system of linear equations from which the propagation constant and the coefficients of the series expansions are obtained. from these quantities, the field distributions and power flow are determined and a characteristic impedance based on a power-voltage definition is computed. The calculated propagation constants are compared with measured values. View full abstract»

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  • Correction Due to a Finite Permittivity for a Ring Resonator in Free Space

    Publication Year: 1984 , Page(s): 1288 - 1293
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (656 KB)  

    To better determine the resonant fields of a dielectric resonator with high permittivity epsilonr, the asymptotic theory with1/√epsilon3 as a small parameter is extended by adding higher order terms in 1/√epsilon r in the fields, the resonant wavenumber, and radiation Q. Extensive data are shown for the Phi independent "nonconfined" mode of a ring resonator, which radiates as a magnetic dipole. Some results are added for the "magnetic quadruple" mode. View full abstract»

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  • Microwave Point Contact Diode Responsivity Improvement through Surface Effects in Vacuum (Short Papers)

    Publication Year: 1984 , Page(s): 1384 - 1387
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    Desorption of air atoms from point contact diode surfaces via exposure to vacuum can give rise to significant changes in electronic characteristics. In the example considered, exposure of an X-band detector to a modest vacuum gives rise to a responsivity increase of about 80 percent for video and heterodyne detection. Experiments indicate that vacuum desorption of minority surface impurities increases the barrier height and decreases tunneling probability, thus increasing diode nonlinearity and making the diodes more nearly "ideal." The resulting relative increase of the thermionic emission current should decrease the effective shot-noise temperature, thus increasing the signal-to-noise ratio (SNR) even further. View full abstract»

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  • A Comparison of IMPATT Oscillator Power and Frequency Above 100 GHz with Results Derived from Theoretical Models

    Publication Year: 1984 , Page(s): 1394 - 1398
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (592 KB)  

    A comparison is made of experimentally determined IMPATT oscillator frequency and power characteristics in the 90-140-GHz band with values obtained from detailed theoretical models. The results show encouraging agreement and demonstrate the potential of the modeling approach for oscillator design. View full abstract»

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  • Microwave Hyperthermic Distributions in a Layered Living Body with Nonlinear Thermoregulatory Properties (Short Papers)

    Publication Year: 1984 , Page(s): 1406 - 1411
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    In this paper, the microwave heating of biological systems with nonlinear thermoregulatory properties is considered. Temperature distributions are calculated in a layered biological model exposed to uniform plane waves. The external surfaces of such a model are cooled and its thermoregulatory properties are assumed to be nonlinear functions of the local temperature. The calculation of the space-time evolution of the temperature is performed using a numerical program that has been developed by applying the finite-difference method. In this numerical program, the nonlinear thermoregulatory functions are given either by a segment-linearization process or by an arbitrary analytical form or by a transformation of an input sample set. The mean power density of the incident electromagnetic wave and the coolant temperature are also taken time-dependent. View full abstract»

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  • E-Plane Integrated Circuit Filters with Improved Stopband Attenuation (Short Papers)

    Publication Year: 1984 , Page(s): 1391 - 1394
    Cited by:  Papers (18)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (528 KB)  

    Improved stopband attenuation is achieved by thick strips, by reduced waveguide sidewall dimensions, and by double planar integrated circuits. In contrast to thick strips which may cause high passband insertion losses and filters with reduced waveguide dimensions which require additional tapers, double planar E-plane integrated circuit filters combine the advantages of low costs, high stopband, and low passband insertion losses. Computer-aided design of a four-resonator Ka -band double metal insert filter achieves a calculated stopband attenuation between 40 and 60 GHz of more than 50 dB, the calculated minimum passband insertion loss is 0.43 dB (measured 1.8 dB). Higher order mode excitation and finite thicknesses of the inserts are included in the calculations. View full abstract»

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  • Coaxial Transmission Lines, Related Two-Conductor Transmission Lines, Connectors, and Components: A U.S. Historical Perspective (Corrections)

    Publication Year: 1984 , Page(s): 1422
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    While revising and editing the above paper, Fig. 5 was inadvertently duplicated. The result of this oversight can be seen on p. 980, where the illustrations for Figs. 4 and 5 are the same. The intended Fig. 4, with its caption, is shown below. View full abstract»

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Aims & Scope

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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