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Microwave Theory and Techniques, IEEE Transactions on

Issue 7 • Date Jul. 1984

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Displaying Results 1 - 17 of 17
  • [Front cover - Jul. 1984 [T-MTT]]

    Page(s): f1 - f2
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    Freely Available from IEEE
  • Losses on Multiconductor Transmission Lines in Multilayered Dielectric Media

    Page(s): 705 - 710
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    For the transmission-line modes, a multiconductor transmission line in a multilayered dielectric medium can be characterized by four matrix parameters the capacitance matrices [C], the inductance matrix [L], the shunt conductance matrix [G], and the series resistance matrix [R]. The first two matrices [C] and [L] can be obtained from equivalent electrostatic and magnetostatic problems. The conductance matrix [G] can be obtained by changing all dielectric constants epsiloni to complex dielectric constants /angle over epsiloni in the equivalent electrostatic problem. The resistance matrix [R] can be obtained by applying a perturbation method to each mode of the transmission line. A computer program has been written for an arbitrary line, and sample computations are presented. View full abstract»

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  • Patent abstracts

    Page(s): 725 - 728
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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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  • Technical Committees

    Page(s): b1 - b2
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    Freely Available from IEEE
  • Design of Waveguide E-Plane Filters with All-Metal Inserts

    Page(s): 695 - 704
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    Waveguide E-plane filters with all-metal inserts are designed by a procedure based on the reflection coefficients of axial inductive strips. The scattering matrix, representing the junction in a bifurcated waveguide, is calculated by a mode-matching method. The reflection coefficient for an inductive strip is then obtained by cascading two scattering matrices separated by a distance equal to the stripwidth. The design is valid up to moderate bandwidths, except for the narrowband design at the higher waveguide frequency range, where both the center frequency and the bandwidth are inaccurate. Possible sources of error are studied and a method minimizing the error is proposed. View full abstract»

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  • Cell Membrane Nonlinear Response to an Applied Electromagnetic Field

    Page(s): 653 - 658
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    The transmembrane potential difference induced by an impressed electromagnetic field in a spherical homogeneous cell with nonlinear membrane is obtained by using the Volterra-series formalism. Some possible generalizations are suggested, and computed results are discussed. View full abstract»

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  • A Quasi-Optical Method for Measuring the Complex Permittivity of Materials

    Page(s): 659 - 665
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    A quasi-optical method for measuring the complex permittivity of materials is described. The determination is derived from measurements of the transmission of a perpendicularly polarized wave through a dielectric slab at different angles of incidence. This relatively simple method is quite sensitive. Accurate estimates of the relative permittivity and the loss tangent can be obtained by accurately measuring the frequency of the signal and by the use of large, precisely machined Fabry-Perot plates. Estimates of the standard errors in the determinations are obtained by using a bootstrap resampling technique. The measurements here are made at a frequency of 93.788 GHz at ambient temperature. View full abstract»

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  • Q-Factor Measurement with Network Analyzer

    Page(s): 666 - 670
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    Ginzton's impedance method of Q-factor measurement is adapted to network analyzer techniques. The circuit model of the resonator incorporates also an external reactance which varies linearly with frequency to take into account the effects of the coupling mechanism and the influence of the distant resonant modes. View full abstract»

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  • A Technique for the Design of Microwave Transistor Oscillators (Short Paper)

    Page(s): 719 - 721
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    A technique for the design of microwave transistor oscillators is presented in which measurements made on an experimentally optimized amplifier are used to calculate six basis oscillator circuits which yield maximum power output. The procedure has been experimentally verified by the construction of a silicon bipolar transistor test oscillator at 1 GHz. View full abstract»

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  • A Nonlinear Analysis of the Effects of Transient Electromagnetic Fields on Excitable Membranes

    Page(s): 670 - 679
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    The transmembrane voltage produced by a transient electromagnetic field has been determined using a nonlinear model of the cellular membrane. The influence on the membrane voltage of the various parameters characterizing the incident field, such as wave-shape, time-width, and amplitude, has been analyzed. In particular, the amplitude of the incident field for which the cell's behavior can be assumed as linear and the threshold level for exciting action potentials on the membrane have been determined. Potential hazards for humans exposed to transient fields are examined in light of this interaction mechanism. View full abstract»

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  • Bragg Interaction of Electromagnetic Waves in a Ferrite Slab Periodically Loaded with Metal Strips

    Page(s): 689 - 695
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    The waveguiding characteristics of electromagnetic TE waves in a ferrite slab periodically loaded with metal strips are investigated. Theoretical formulation by means of the spectral domain approach is employed to obtain the Brillouin diagrams of two types of volume modes and a surface mode. It is found that the nonreciprocal properties of waves depend on the metal strip profile and bias magnetic field strength. Experiments on the magnetic-field dependence of the Bragg frequency and the stop bandwidth are carried out in the millimeter-wave frequencies. Typical results obtained from a polycrystalline YIG slab with periodic gold strips deposited on one surface are stop bandwidth about 2.14 GHz, with return loss about 2 dB at the Bragg frequency of 47.5 GHz, for the bias magnetic-field strength of 5.7 kG. The Bragg frequency can be tuned over the range of 1.39 GHz by varying the bias magnetic field from 0 to 8.2 kG. Experimental results show good agreement with theoretical predictions. View full abstract»

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  • 94-GHz 4-Port E-Plane Junction Circulator (Short Paper)

    Page(s): 722 - 724
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    A 4-port junction circulator for use in 94-GHz E-plane integrated circuits is investigated. The design incorporates an E-plane X-junction of standard metal waveguides with a single ferrite disk on one of the narrow walls of the junction plus a metal plunger extending into the junction from the opposite side. The plunger is used to tune the n = 0 mode to the circulator center frequency and additionally can be used to tune the circulator center frequency over several gigahertz without critically degrading circulator performance, Minimum insertion loss of 0.65 dB was typical in a series of 12 plunger-tuned circulators with adjacent port isolation better than 20 dB, and crossport isolation better than 15 dB over nearly a 1-GHz bandwidth. View full abstract»

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  • An Investigation of Striplines and Fin Lines with Periodic Stubs

    Page(s): 684 - 685
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    In this paper, a technique based on the network-analytical formalism of electromagnetic fields is used to analyze the strip and fin lines with periodic stubs. Numercal results for the dispersion characteristics of the periodically loaded lines are presented. The effect of the loading stubs on the passband and stopband characteristics is investigated. View full abstract»

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  • A Method of Avoiding the Edge Current Divergence in Perturbation Loss Calculations (Short Paper)

    Page(s): 717 - 719
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    From a consideration of the properties near the edge of a flat finite-thickness strip and an elliptic cross-section strip, it is shown that the divergence that arises in the perturbation method near a sharp edge can be handled by halting the loss calculation at a definite distance just short of the strip edge. This distance can be expressed in terms of the radius of curvature at the tip for a rounded edge, and in terms of the strip thickness for a flat edge. View full abstract»

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  • Analysis of Low-Loss Broadside-Coupled Dielectric Image Guide Using the Mode-Matching Technique (Short Papers)

    Page(s): 711 - 717
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    The solutions of electromagnetic field equations of the broad-side-coupled dielectric image guide are derived using the mode-matching technique. The even- and odd-mode dispersion characteristics are presented as a function of the dimensional parameters of the guide for the low-loss mode for which the principal electric field is parallel to the metal image planes. View full abstract»

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  • Microwave Helix Waveguide Absorption Cell for Passive Frequency Standard

    Page(s): 721 - 722
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    A new closed absorption cell, which has been developed for a passive frequency standard, is described. This cell is made from a cylindrical quartz tube with copper wire wound around it. For the limiting case of the zero pitch helix, Maxwell's equations are graphically solved, which show that the cell is operating like a monomode waveguide at 23.8 GHz, the frequency of interest, and can be used from 10 to 100 GHz with few modifications. View full abstract»

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  • A Novel K-Band Balanced FET Up-Converter

    Page(s): 679 - 683
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    The performance of the K-band balanced FET up-converter is described. A novel circuit configuration effective in enhancing conversion gain in the FET up-converter is proposed. An analysis using a simplified circuit model shows the effect of LO feedback in the balanced circuit. A conversion gain of 0.9 dB was experimentally obtained at 20 GHz. Maximum output power was 15.9 dBm. 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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