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IEEE Transactions on Microwave Theory and Techniques

Issue 4 • Apr. 1985

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Displaying Results 1 - 24 of 24
  • [Front cover - Apr. 1985 [T-MTT]]

    Publication Year: 1985, Page(s):f1 - f2
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    Freely Available from IEEE
  • Editorial

    Publication Year: 1985, Page(s): 295
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    Freely Available from IEEE
  • Technology Summaries for Microwave Theory and Techniques - 1983 (Correction)

    Publication Year: 1985, Page(s): 351
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (68 KB)

    In the October 1984 IEEE Transactions on Microwave Theory and Techniques, the above paper, a technology summary edited by B. E. Spielman, was published. This paper included inputs from the Technical Committees MTT-6, MTT-7, MTT-15, and MTT-16. A correction should be made to the "Microwave Systems--1983" section of the paper, pp. 1377-1378. View full abstract»

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  • Patent Abstracts (Apr. 1985 [T-MTT])

    Publication Year: 1985, Page(s):352 - 355
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    Freely Available from IEEE
  • Membership application

    Publication Year: 1985, Page(s):356 - 357
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  • IEEE Annual Combined Index [advertisement]

    Publication Year: 1985, Page(s): 357
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  • Table of contents, Preview of May (1985 [T-MTT])

    Publication Year: 1985, Page(s): 358
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  • [Back cover - Apr. 1985 [T-MTT]]

    Publication Year: 1985, Page(s):b1 - b2
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  • Waveguide and Cavity Oscillations in the Presence of Nonlinear Media

    Publication Year: 1985, Page(s):296 - 301
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    This paper deals with the problem of waves in metallic structures containing nonlinear media. Problems of this kind are encountered in the analysis of microwave devices operated at high power levels, or when the constitutive parameters of nonlinear materials are investigated by means of microwave measurements. The Volterra series are the functional analog of the well-known Taylor series for functi... View full abstract»

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  • Limitations of the Cubical Block Model of Man in Calculating SAR Distributions (Comments)

    Publication Year: 1985, Page(s):347 - 350
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    The above paper raised some serious questions regarding the accuracy of three-dimensional block model solutions obtained using a pulse-function basis. While I am in qualitative agreement with about half of the numerical results presented in the paper, I most strongly disagree with most of the interpretations which the authors have made using those results. It is my belief that it is possible to ob... View full abstract»

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  • Optical Injection Locking of BARITT Oscillators (Comments)

    Publication Year: 1985, Page(s):343 - 344
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    We were interested to read the above short paper, but would like to point out that experimental results on the optical injection locking of IMPATT oscillators have indeed been obtained. Over the last few years, reports of such experiments have appeared in the literature from groups in both Europe and the U.S.A. View full abstract»

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  • Application of Boundary-Element Method to Electromagnetic Field Problems (Comments)

    Publication Year: 1985, Page(s):346 - 347
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The above paper has explained a general formulation of the boundary-element method (BEM) for analyzing two-dimensional electromagnetic fields, and has presented numerical examples for some boundary shapes to show that the BEM is a very powerful numerical method for solving electromagnetic field problems. It gives accurate results with far fewer nodes than the finite-element method, and can also tr... View full abstract»

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  • Adjustment of In-Phase Mode in Circulators Using Turnstile Junctions

    Publication Year: 1985, Page(s):339 - 343
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    The adjustment of the counter-rotating modes of waveguide circulators using weakly magnetized turnstile junctions is fairly well understood, but some uncertainty about the definition of the in-phase mode still remains. The purpose of this paper is to remedy this situation by experimentally evaluating the in-phase eigenvalue s0 for different filling factors and radial wavenumbers of the ... View full abstract»

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  • Fast-Fourier-Transform Method for Calculation of SAR Distributions in Finely Discretized Inhomogeneous Models of Biological Bodies (Comments)

    Publication Year: 1985, Page(s):345 - 346
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    In the above paper, Borup and Gandhi state in their Section IV that, in addition to their FFT method, "Thus far, the only technique available to compute SAR distributions for models of man is the method of moments (MOM)." In this letter, we would like to point out that there exists a viable alternative numerical approach which has been the subject of intense research and numerous publications over... View full abstract»

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  • The Annular Slot Antenna in a Lossy Biological Medium (Short Papers)

    Publication Year: 1985, Page(s):314 - 319
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    An integral equation is formulated for a coaxially fed annular aperture antenna. The integral equation in terms of the unknown tangential aperture electric field is solved numerically by the Method of Moments. The coaxial feed line is air filled while the exterior region consists of i) air, ii) fat or bone, and iii) muscle. Results are given for the aperture electric field, apparent input admittan... View full abstract»

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  • Slow-Wave Propagation in Two Types of Cylindrical Waveguides Loaded with a Semiconductor (Short Papers)

    Publication Year: 1985, Page(s):335 - 339
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    For a parallel-plate waveguide and a microstripline loaded with a semiconductor slab of resistive (or active) character, the complex propagation constant gamma is determined. Gamma is found for higher order branches for microwave and millimeter-wave frequencies between 10 and 140 GHz, representing a study of phase velocity slowing (and attenuation). View full abstract»

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  • Functional Approach to Microwave Postproduction Tuning

    Publication Year: 1985, Page(s):302 - 310
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB)

    This paper deals with the postproduction tuning problem in microwave circuits using the functional approach. The main aspects of the problem are addressed. In particular, we consider the choice of the critical samples of the response, the choice of the most effective tunable parameters, and the description of two functional tuning algorithms. Minimax optimization is used to identify the tuning fre... View full abstract»

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  • Interaction of the Near-Zone Fields of a Slot on a Conducting Sphere with a Spherical Model of Man (Correction)

    Publication Year: 1985, Page(s):350 - 351
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    In the above the conducting paper, we have assumed that on the surface of sphere, the electric field exists only on the slot aperture and zero field elsewhere. This assumption is unrealistic. For a realistic conducting sphere, the slot field can excite a normal component of the electric field on the spherical surface, implying the existence of induced surface charge. With the modified assumption, ... View full abstract»

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  • Integration Method of Measuring Q of the Microwave Resonators (Further Comments)

    Publication Year: 1985, Page(s): 344
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (90 KB)

    In reply to our comments concerning his paper. View full abstract»

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  • Mathematical Expression of the Loading Characteristics of Microwave Oscillators and Injection-Locking Characteristics (Short Paper)

    Publication Year: 1985, Page(s):319 - 323
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    Most of the studies concerning microwave oscillators have so far been based on the Van der Pol oscillator model. However, this model is too simple to obtain good agreement between observation and theory. Our previous paper proposed a new mathematical model which describes the loading characteristics of oscillators more accurately than the Van der Pol model does. In this paper, we have investigated... View full abstract»

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  • New Narrow-Band Dual-Mode Bandstop Waveguide Filters (Comments)

    Publication Year: 1985, Page(s):344 - 345
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    I have read the above paper with interest, but find some possible discrepancies between the data presented in Fig. 4 and the data presented in Fig. 6. It seems to me that the data in Fig. 4 is probably accurate, reflecting as it does the rejection obtainable through a single pair of ports coupling to a dominant mode propagating waveguide. No matter how the multiple pole filter is synthesized in th... View full abstract»

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  • A New Cylindrical Electron Gun for Low-Power Tunable Gyrotrons with High Magnetic Compression Ratios

    Publication Year: 1985, Page(s):323 - 327
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    Because of the high magnetic compression ratio required, electrons in the Sydney University tunable gyrotron undergo multiple reflections before entering the resonant cavity. This results in unstable and unpredictable operation. A new cylindrical gun has been designed and fabricated. Computer simulations have predicted favorable broad-band behavior, and this has been confirmed by testing in the tu... View full abstract»

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  • Highly Stable Dielectric Resonator FET Oscillators

    Publication Year: 1985, Page(s):310 - 314
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The long-term frequency drift of GaAs FET oscillators with temperature has been analyzed theoretically and experimentally in view of stabilization using dielectric resonators. It was found that the dielectric material stability and quality factor should be within certain limits, and, in addition, that the resonance frequency over the temperature characteristic should be quite linear. Such a materi... View full abstract»

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  • Probe Mutual Impedance in a Rectangular Waveguide (Short Papers)

    Publication Year: 1985, Page(s):327 - 335
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    The mutual impedance between two probes, arbitrarily located on the broad walls of a rectangular waveguide, is derived by using the reaction concept. This mutual impedance is found to depend on the location and height of the probes and their separation distance. For probes of equal height, it reduces to the probe self impedance, as the probe separation distance approaches zero. The convergence of ... 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..

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Luca Perregrini
luca.perregrini@unipv.it

Editor-in-Chief
Jose Carlos Pedro
edit.tmtt@ua.pt