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Microwave Theory and Techniques, IEEE Transactions on

Issue 8 • Date Aug. 1985

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Displaying Results 1 - 23 of 23
  • [Front cover - Aug. 1986 [T-MTT]]

    Publication Year: 1985 , Page(s): f1 - f2
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    Freely Available from IEEE
  • Patent Abstracts (Aug. 1985 [T-MTT])

    Publication Year: 1985 , Page(s): 742 - 745
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    Freely Available from IEEE
  • Announcement

    Publication Year: 1985 , Page(s): 746
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    Freely Available from IEEE
  • [Back cover - Aug. 1985 [T-MTT]]

    Publication Year: 1985 , Page(s): b1 - b2
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    Freely Available from IEEE
  • Transient Analysis of Microstrip Gap in Three-Dimensional Space (Short Paper)

    Publication Year: 1985 , Page(s): 726 - 730
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (432 KB)  

    In this paper, we deal with the microstrip gap that should be analyzed in three-dimensional space. The time variations of the electric field at each surface of the stripline having a finite metallization thickness are analyzed. Our method of analysis is based on both an equivalent circuit of Maxwell's equations and Bergeron's method. The former has advantages in the vector analysis by using all electromagnetic components. The latter has advantages in the time-domain analysis of the field. Therefore, our method can analyze field variations in three-dimensional space and time. We present the time variation of the instantaneous electric-field distributions below the strip, at the side of the strip, and at the gap end surface. These results show how the steady-state field distribution grows in the gap. View full abstract»

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  • Ka-Band FET Oscillator (Short Paper)

    Publication Year: 1985 , Page(s): 731 - 734
    Cited by:  Papers (1)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (720 KB)  

    The design and performance of GaAs FET oscillators operating near 36 GHz are presented. The oscillators used readily available GaAs FET's and were built in a microstrip circuit configuration. An output power of about +8 dBm was obtained with two devices in a single oscillator. View full abstract»

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  • The Thermal and Spatial Resolution of a Broad-Band Correlation Radiometer with Application to Medical Microwave Thermography (Short Paper)

    Publication Year: 1985 , Page(s): 718 - 722
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (592 KB)  

    The improved spatial and thermal resolution of a broad-band microwave correlation radiometer is discussed. Theoretical upper and lower bounds of the combined spatial and thermal resolution in a dense transmission medium are presented along with data obtained for two thermal sources in air. The application of broad-band correlation techniques to medical microwave thermography is novel, and the results indicate that electronic scanning of tissue should be possible. View full abstract»

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  • Bandstop Filter Design Using a Dielectric Waveguide Grating

    Publication Year: 1985 , Page(s): 693 - 702
    Cited by:  Papers (6)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (992 KB)  

    Precision design techniques are obtained for dieletric waveguide (DW) bandstop filters with bandwidths up into the 5-10-percent range. Dielectric waveguide bandstop filters are realized in the form of a grating in the DW image guide which utilizes notches of varying depth and length. The grating is designed from a transmission-line prototype which has a prescribed stopband and also prescribed Chebyshev passbands. An approximate synthesis procedure for such prototypes is presented. Design data for grating notches were obtained from tests on uniform gratings, while DW dispersion is compensated for by calculations based on the "effective dielectric constant" method. Excellent agreement between computed and measured attenuation response is obtained. Two such grating structures used with loads on one end and a 3-dB coupler can be used to form a bandpass filter. View full abstract»

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  • Dispersion Characteristics for Wide Slotlines on Low-Permittivity Substrates (Short Paper)

    Publication Year: 1985 , Page(s): 723 - 726
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (392 KB)  

    This paper provides additional dispersion data on slotlines not available in the literature to date. In particular, data are presented on wide slots etched on an electrically thin substrate of low-dielectric constant. The range of parameters covered in this paper are 0.006<= d/lambda0 <=0.06, 0.005 <= W/lambda0 <=2.0, and epsilon r =2.22, 3.0, 3.8, 9.8. The problem is formulated using the spectral-domain technique, and the spectral Galerkin's method is employed to compute the slot wavelength. Numerical results are compared to the experimental data over 2-6 GHz for slotlines on a 1.57-mm substrate (epsilonr = 2.55). Agreement to within 2.0 percent is obtained. View full abstract»

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  • A Novel Quasi-Optical Frequency Multiplier Design for Millimeter and Submillimeter Wavelengths (Correction)

    Publication Year: 1985 , Page(s): 741
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (152 KB)  

    In the above paper, there is a typographical error in an equation on p. 424, first column. View full abstract»

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  • Efficient, Linear Amplification of Varying-Envelope Signals Using FET's with Parabolic Transfer Characteristics

    Publication Year: 1985 , Page(s): 703 - 710
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1120 KB)  

    A linear, high-efficiency mode of operation is described for FET power amplifiers of varying envelope signals (e.g., single-sideband, quadrature-amplitude-modulation, and multicarrier signals). It makes use of FET's having parabolic transfer characteristics (PTC). It is shown theoretically and experimentally that the efficiency of the PTC mode is about 2 dB higher than that of the standard class-A mode. For example, two-tone, 4-GHz measurements on a Western Electric FET model 131-L showed that, for an output power of about 1.5 W and for a relative third-order intermodulation level of -35 dB, the power-added efficiency of the PTC mode was 20 percent, while that of the class-A mode was 13 percent. Comparisons are also made with other high-efficiency modes of operation proposed elsewhere. View full abstract»

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  • A Variational Analysis of Dielectric Waveguides by the Conformal Mapping Technique

    Publication Year: 1985 , Page(s): 681 - 685
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (528 KB)  

    The variational formulation together with the finite-element method is a well-established technique for the solution of a dielectric waveguide. One common difficulty is the handling of the problem with the infinite extent of the electromagnetic fields in the transverse plane. In this paper, the conformal mapping technique is employed to improve the modeling of the region exterior to the guides; hence it may give more accurate results for the modes near the cutoff region. Also included are the numercal results for rectangular, strip, and channel waveguides to demonstrate the applications of the proposed technique. View full abstract»

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  • Design of Nonradiative Dielectric Waveguide Filters (Correction)

    Publication Year: 1985 , Page(s): 741
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (152 KB)  

    In the above paper, Figs. 1 and 7 should be interchanged. View full abstract»

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  • An Exposure System for Variable Electromagnetic-Field Orientation Electrophysiological Studies

    Publication Year: 1985 , Page(s): 674 - 680
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (656 KB)  

    A TEM system for exposing isolated nerve cells at 2 GHz is described. The system allows for monitoring of transmembrane potentials by means of microelectrodes and variation of the angle between the electric-field vector and the cell. An S-parameter characterization of the system is included along with temperature profile measurements for the energy distribution within the exposure chamber. Additional data on the transient electrical characteristics of microelectrodes upon exposure to microwave pulses in this system are included along with a few examples of the response of Aplysis pacemaker neurons to microwave fields. View full abstract»

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  • Integral Transforms Useful for the Accelerated Summation of Periodic, Free-Space Green's Functions (Short Paper)

    Publication Year: 1985 , Page(s): 734 - 736
    Cited by:  Papers (36)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (360 KB)  

    The Poisson summation formulas for two- and three-dimensional, periodic, free-space Green's functions of the Helmholtz and Laplace equations are cataloged in this paper. It is shown how these formulas can he applied for the efficient, approximate summation of series which arise in the computation of fields due to an infinite array of charge or current sources. The technique for approximating the summation of the series is valid for all arguments of a Green's function, even those which correspond to the region near a source singularity. View full abstract»

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  • Attenuation Constants of UHF Radio Waves in Arched Tunnels (Short Paper)

    Publication Year: 1985 , Page(s): 714 - 718
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    This paper describes the attenuation constants of UHF radio waves in arched tunnels. In the analysis, a point-matching method is combined with Muller's method and is applied to determine the propagation constant of the dominant mode. We compare the calculated result with previous experimental data, as well as that of the experimental equation and the theoretical result of a circular waveguide having the same cross-sectional area. Finally, an approximate equation for the attenuation constant is derived from the point-matching solution so that one can determine or estimate the value without elaborate calculations. View full abstract»

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  • Design and Performance of Monolithic GaAs Direct-Coupled Preamplifiers and Main Amplifiers

    Publication Year: 1985 , Page(s): 686 - 692
    Cited by:  Papers (9)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (896 KB)  

    The design and performance of a GaAs direct-coupled preamplifier and main amplifier is described. The amplifiers are fabricated by the self-aligned implantation for n+ -Iayer technology (SAINT) process. The developed preamplifiers have 13-dB gain, 3-GHz bandwidth, and 4.8-dB noise figure for the one-stage amplifier, and 22-dB gain, 2.7-GHz bandwidth, and 5.6-dB noise figure for the two-stage amplifier. The developed four-stage main amplifier has 36-dB gain and 1.5-GHz bandwidth with a power consumption of 710 mW. These amplifiers are promising candidates for application to high-speed data communication systems. View full abstract»

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  • Vector Analyses of Propagation Constants in Dielectric Optical Waveguides with Perturbed Refractive-Index Profile

    Publication Year: 1985 , Page(s): 667 - 673
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (552 KB)  

    A new method is developed to evaluate the propagation constants of guided or leaky modes in cylindrical dielectric optical waveguides with arbitrary cross sections. It is assumed that the refractive-index profiles of the fiber deviate from the step-index ones. Format expressions of the propagation constants are given for waveguides with anisotropically perturbed refractive-index profiles. The method is applied to a circular step-index fiber with an azimuthally perturbed refractive-index profile, and it is shown that scalar analyses cannot properly predict the propagation constants of those modes whose angular order satisfies certain conditions with respect to the Fourier spectrum of the perturbation of the refractive-index profile. View full abstract»

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  • A Method for Evaluating and the Evaluation of the Influence of the Reverse Transfer Gain on the Transducer Power Gain of Some Microwave Transistors (Short Paper)

    Publication Year: 1985 , Page(s): 711 - 713
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (280 KB)  

    The unilateral figure of merit is frequently used to decide whether, from the viewpoint of transducer power gain, a transistor can be considered to be unilateral or not. In this communication, the limitations of this measure are discussed and alternative measures, as well as a procedure for determining the exact bounds on the gain error G/subT//GT,u., are proposed and applied to several microwave transistors in order to evaluate the influence of the reverse transfer gain on the transducer power gain. View full abstract»

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

    Publication Year: 1985 , Page(s): 740 - 741
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    In the above paper, a criterion has been given in order to establish if the scattering problem of the junction between two waveguides with different surface impedances can be solved in closed form. In this comment, a different approach, based on a spectral formulation, shows that the possibility to obtain analytical expressions of the scattering coefficients depends on the form of the relevant Wiener-Hopf equation. View full abstract»

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  • Optical Fiber Delay-Line Signal Processing (Correction)

    Publication Year: 1985 , Page(s): 740
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (85 KB)  

    Due to a clerical error, the above paper by K. P. Jackson, S. A. Newton, B. Maslehi, M. Tur, C. C. Cutler, J. W. Goodman and H. J. Shaw appeared in the March 1985 issue (pp. 193-210) without being identified as an Invited Paper. View full abstract»

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  • A New Transmission Line of Round Conductor and Parallel Plane with Symmetrically Placed Slit (Short Paper)

    Publication Year: 1985 , Page(s): 739 - 740
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (168 KB)  

    A new transmission line consisting of a cylindrical conductor symmetrically placed opposite a slit in an infinite flat plate is formed by inversion from the fine of parallel plates of equal width. The characteristic admittance of the proposed line and one possible application of which is given. View full abstract»

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  • Constant-Frequency Synthesis of Lossy Microwave Two-Ports (Short Papers)

    Publication Year: 1985 , Page(s): 736 - 738
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (320 KB)  

    At a fixed frequency, every linear time-invariant two-port can be described by its scattering matrix, whose elements represent eight real parameters. In this paper, it is proved that every Iossy (linear, time-invariant) two-port can be canonically synthesized by eight "elementary" two-ports, which are characterized by one parameter only. Moreover, these elementary two-ports are passive and realizable in the microwave region. The synthesis is performed in the form of a cascade structure (with one "side arm" for the nonreciprocal case). Explicit formulas for the parameters of the elementary two-ports are derived. 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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