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Microwave Theory and Techniques, IEEE Transactions on

Issue 6 • Date November 1964

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  • [Front cover - Nov. 1964]

    Publication Year: 1964 , Page(s): f1 - f2
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    Freely Available from IEEE
  • Index to IEEE Transactions on Microwave Theory and Techniques, Nov. 1964

    Publication Year: 1964 , Page(s): i - xi
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  • Table of contents - November 1964

    Publication Year: 1964 , Page(s): 581
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  • Microwave and High-Frequency Calibration Services of the National Bureau of Standards - Part III (Correspondence)

    Publication Year: 1964 , Page(s): 623 - 624
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  • Contributors

    Publication Year: 1964 , Page(s): 625
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    Freely Available from IEEE
  • Institutional listings

    Publication Year: 1964 , Page(s): b1 - b2
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  • Quasi-Optical Waveguide Filters (Correspondence)

    Publication Year: 1964 , Page(s): 618 - 619
    Cited by:  Papers (5)
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  • Multiband Cavity for High Temperature Plasma Measurements (Correspondence)

    Publication Year: 1964 , Page(s): 616 - 617
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  • Quick Coaxial Phaseshifter for 150 Watts (Correspondence)

    Publication Year: 1964 , Page(s): 620 - 621
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  • A High Isolation/High Speed Microwave Modulator (Correspondence)

    Publication Year: 1964 , Page(s): 622
    Cited by:  Papers (1)
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  • Delay Equalization by Tapered Cutoff Waveguides

    Publication Year: 1964 , Page(s): 608 - 615
    Cited by:  Papers (16)
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    When a wave packet propagates in a guided mode subject to cutoff at a definite frequency, dispersion is always present. To restore the shapes of the wave packets at the receiving end, a proper delay equalization must be applied. Waves propagating in a waveguide tapered to cutoff dimensions are reflected mostly in a region where the dimensions are at cutoff. Accordingly waves of higher frequencies will penetrate deeper into the tapered guide and thereby introduce more delay than those of lower frequencies. A profile of a tapered waveguide is obtained for the case of linear delay on the hypothetical assumption that a wave is totally reflected only at the plane of cutoff dimensions. The problem of finding a proper profile is similar in nature to the inverse scattering problem in quantum mechanics. The complex input reflection coefficient introduced by a tapered cutoff waveguide is invariably unity in its magnitude for all frequencies below cutoff and has different phases for different frequencies. Presently available theory for computing the complex reflection coefficient is valid only when its magnitude is smaller than unity. A theoretical method to calculate with accuracy the phase of such unity reflection coefficient is presented. The linking section between the standard waveguide and the tapered cutoff waveguide is designed on the basis of a high-pass filter that introduces no appreciable perturbation to the prescribed delay characteristic. The excellent agreement between the theoretical results and measured data suggests that microwave delay equalizers can be designed "on paper" with "measurement" accuracy without even going to the laboratory. Accordingly the claim can be made that any reasonable amount of delay of simple shape within certain bandwidth limits can be equalized by the present approach. View full abstract»

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  • Message from the Editor

    Publication Year: 1964 , Page(s): 582 - 583
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    For the most part, authors of papers and correspondence items for the IEEE Transactions on Microwave Theory and Techniques need little specific information before submitting a paper and can usually determine most of the information they need by examining several late issues. View full abstract»

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  • Radiation Characteristics for a Magnetic Line Source in Homogeneous Electron Plasmas (Correspondence)

    Publication Year: 1964 , Page(s): 617 - 618
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  • Equivalence of Different Integral Equations for Confocal Resonators (Correspondence)

    Publication Year: 1964 , Page(s): 624
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  • Synthesis of Filter-Limiters Using Ferrimagnetic Resonators

    Publication Year: 1964 , Page(s): 599 - 607
    Cited by:  Papers (4)
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    A synthesis procedure is developed for microwave band-pass filters with the Chebyshev response using orthogonal circuit resonators coupled by a ferrimagnetic resonator. A stripline ferrimagnetic resonator filter is analyzed in detail. Equations and graphs are given which allow the selection of ferrimagnetic material and size of the ferrimagnetic sample necessary to achieve a desired bandwidth and insertion loss for a given pass-band response. The theoretical behavior of these circuits as microwave power limiters is discussed and it is shown that the ratio of the limiting threshold to the filter bandwidth is a constant depending only on the pass band response shape. Experimental confirmation of the design information discussed as well as some practical methods of varying the limiting threshold. View full abstract»

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  • Improvement of the Wall-Current Detector (Correspondence)

    Publication Year: 1964 , Page(s): 616
    Cited by:  Papers (1)
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  • Total System Noise Temperature: 15°K (Correspondence)

    Publication Year: 1964 , Page(s): 619 - 620
    Cited by:  Papers (4)
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  • Asymmetric Coupled-Transmission-Line Magic-T

    Publication Year: 1964 , Page(s): 595 - 599
    Cited by:  Papers (18)
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    A Magic-T was designed using a 3-db asymmetric coupled-transmission-line directional coupler and a schiffman phase shift network. Expressions for the coupling and phase difference of the outputs of the basic coupler were obtained. Two phase shift networks for compensating the phase variation in the coupled outputs were investigated. The Schiffman phase shift network was shown to provide the best compensation over a given bandwidth. One unit designed in strip transmission line to operate from 2 to 4 Gc showed good agreement with the theory. The maximum difference in output power was 0.4 db, and the phase deviation was less than 4°. The isolation between the input ports was greater than 25 db, while the isolation between output ports was greater than 21db throughout the entire band. Levy's design equations for a two-section asymmetric coupler with optimum coupling distribution are given for completeness. View full abstract»

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  • Recent Linewidth Measurements with a Cross-Guide Coupler (Correspondence)

    Publication Year: 1964 , Page(s): 621 - 622
    Cited by:  Papers (1)
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  • Internal Reflections In Dielectric Prisms

    Publication Year: 1964 , Page(s): 584 - 587
    Cited by:  Papers (3)
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    A pair of closely spaced dielectric prisms used as an adjustable bidirectional coupler has been discussed by a number of investigators. In its simplest form this device permits an adjustable arbitrary distribution of power output in two directions at right angles to one another. Reflections from the external air-dielectric interfaces change the power distribution from the theoretically computed values and resuft in power output in a third direction. This paper describes a theoretical calculation of the power transmission in all four directions taking into account reflections at all interfaces. Experimental data recorded at 35 Gc exhibit very good agreement with predicted results. View full abstract»

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  • Nonreciprocal Coupling with Single-Crystal Ferrites

    Publication Year: 1964 , Page(s): 587 - 594
    Cited by:  Papers (5)
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    A calculation of nonreciprocal coupling in microwave circuits with small ferrite samples tuned to ferromagnetic resonance is presented. It is shown that this coupling may be applied to the construction of simple resonant isolators, gyrators and circulators. Experimental results for the coupling in rectangular and ridge guides, applying YIG spheres, are presented. The construction of a simple X-band waveguide junction, acting as a 4-port resonant circulator, is described. Such a filter circulator, which may act as a switch or a frequency selective power divider, can be made tunable over the waveguide frequency range, with a bandwidth in the order of 10 Mc, and with values of insertion loss and isolation, which are comparable to those of conventional circulators. 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
Dominique Schreurs
Dominique.Schreurs@ieee.org

Editor-in-Chief
Jenshan Lin
jenshan@ieee.org