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Microwave Theory and Techniques, IEEE Transactions on

Issue 2 • Date February 1970

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Displaying Results 1 - 14 of 14
  • [Front cover - Feb. 1970]

    Publication Year: 1970 , Page(s): f1 - f2
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    Freely Available from IEEE
  • Table of contents - February, 1970

    Publication Year: 1970 , Page(s): 77
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    Freely Available from IEEE
  • Computer program descriptions

    Publication Year: 1970 , Page(s): 115
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    First Page of the Article
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  • Contributors, Feb., 1970

    Publication Year: 1970 , Page(s): 117 - 118
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    Freely Available from IEEE
  • Microwave abstracts

    Publication Year: 1970 , Page(s): 119 - 120
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    Freely Available from IEEE
  • [Back cover]

    Publication Year: 1970 , Page(s): b1 - b2
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    Freely Available from IEEE
  • Capacitance Determination for Infinite Interdigital Structures (Program Descriptions)

    Publication Year: 1970 , Page(s): 116
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (152 KB)  

    This subprogram determines the capacitance per half-strip pair of an infinitely long interdigital structure composed of finite-sized strips between dissimilar dielectrics, with or without a parallel ground plane. View full abstract»

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  • Numerical Data Processing of Reflection Coefficient Circles

    Publication Year: 1970 , Page(s): 96 - 100
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    A numerical procedure is described for processing the data of a microwave measurement in which the measured points are distributed in a form of a circle in a complex plane. Instead of plotting the measured data on a Smith chart and analyzing them by graphical methods, the data are analyzed by the method of least squares. The result of this analysis consists of three complex numbers K, L, and M, which define the bilinear transformation in question. The procedure is illustrated on the example of impedance versus bias measurements on a varactor diode which was recently described by E. W. Sard. The necessary formulas are derived for computation of elements of the equivalent circuit from the above constants K, L, and M. The procedure is well-suited for programming a digital computer. View full abstract»

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  • An Analytical Method for Calculating Microstrip Transmission Line Parameters

    Publication Year: 1970 , Page(s): 78 - 87
    Cited by:  Papers (16)
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    When finite difference techniques are applied to the solution of coupled-line parameters for microstrip transmission lines, the computation times become prohibitively long. This paper describes an analytical method for calculating such parameters if TEM propagation is assumed. The method is applicable to a wide range of planar TEM mode transmission line calculations where the boundaries and dielectric interfaces are rectilinear. The accuracy of the analytical technique has been verified by experimental work on 10 dB and 6 dB coupled-line directional couplers and a parallel-coupled Cohn type 6 resonator filter. View full abstract»

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  • Longitudinal Section Mode Analysis of Dielectrically Loaded Rectangular Waveguides with Application to Phase Shifter Design

    Publication Year: 1970 , Page(s): 88 - 95
    Cited by:  Papers (25)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (712 KB)  

    The structure consisting of an E-plane dielectric slab partially filling a rectangular waveguide is examined with attention on those higher order mode propagation characteristics that are relevant to the design of nonreciprocal remanence ferrite phase shifters. The validity of the model is established by introducing experimental comparison in the form of VSWR measurements for both pure dielectric loading and an actual composite ferrite phase shifter. Emphasis is placed on the consideration of possible mechanisms for the elimination of LSE11, LSM11, and LSE12 modes, since certainly the first, most probably the second, and quite possibly the third will propagate in a practical device. Experimental verification of theoretical predictions is established and phaser design guidelines are drawn. Some additional topics, such as slabcorner chamfering and the effect of the switching wire, are included for completeness. View full abstract»

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  • Power Flow and Energy Storage in Piezoelectric Semiconductor Devices

    Publication Year: 1970 , Page(s): 105 - 111
    Cited by:  Papers (1)
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    Traditionally the phenomenological constitutive relations for piezoelectric materials explicitly relate the electric displacement D¯ the electric intensity E¯, the stress tensor, and the strain tensor. This paper presents a new formulation for the theory of coupled wave interactions in a class of important hexagonal piezoelectric devices; here an equivalent dielectric description explicitly involving only D¯ and E¯ replaces (without approximation) the traditional formulation. The new formulation supplies the foundation for a new determination of power flow and energy storage on a basis broad enough to include the effects of diffusion and collisions on multivelocity multispecies carrier streams. The results, when specialized to a single-velocity single-species carrier stream, differ significantly with others recently proposed for those circumstances. The general results display a considerable degree of compactness and simplicity and are "electrically invariant" in that they hold for insulating, photoconducting, and semiconducting piezoelectric materials without any change in basic form. View full abstract»

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  • Properties of Microstrip Lines on Fused Quartz (Correspondence)

    Publication Year: 1970 , Page(s): 113 - 114
    Cited by:  Papers (5)
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    The attenuation constant for microstrip lines on fused quartz and their effective relative dielectric constant were measured and the results are discussed. The propagation losses in these lines proved to be smaller than those mentioned in the literature. The effective relative dielectric constant is found to be independent of frequency up to 12 GHz. The conductors were deposited without an adhesive layer but with sufficient adhesion for pressure bonding semiconductor chips. View full abstract»

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  • Equivalent Circuit of Orthogonal-Loop-Coupled Magnetic Resonance Filters and Bandwidth Narrowing Due to Coupling Inductance

    Publication Year: 1970 , Page(s): 100 - 105
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB)  

    The equivalent circuit of an orthogonal-loop-coupled magnetic resonance filter is shown to consist of a gyrator, two ferrite-induced inductances, and two coupling loop inductances. The effects of the coupling inductances on the passband and stopband responses are shown to be significant by means of calculations based on this equivalent circuit. It is proved that the maximum passband bandwidth Δ∮-3dB = ∮0 (Lf / Lc), where ∮0, is the center frequency, and Lf and Lc the ferrite-induced and the coupling-loop inductance, respectively. Other unusual insertion-loss characteristics of this filter which differ from those of a conventional reciprocal-element bandpass filter are shown. Finally, a test circuit for determining experimentally the coupling inductance ratio Lc /Lf and the external Q, Qf of a ferrite resonator is presented. View full abstract»

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  • Further Analysis of the Off-Null Versus Power Ratio Method of Attenuation Measurement (Correspondence)

    Publication Year: 1970 , Page(s): 112 - 113
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    Analysis of calibration data of a rotary-vane attenuator has yielded closer agreement between the recently developed off-null and the proven power ratio methods of attenuation measurement. A constant bias was discovered in the measured valures of attenuation difference, and a procedure is described to correct for this bias. After the correction is applied, the average agreement between the two methods of measurements is improved an order of magnitude, namely, from a former 2.0 percent to 0.17 percent. 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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