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Microwave Theory and Techniques, IEEE Transactions on

Issue 4 • Date April 1968

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  • Table of contents - April 1968

    Publication Year: 1968 , Page(s): 209
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  • The Theoretical Design of Broadband 3-Port Waveguide Circulators (Correspondence)

    Publication Year: 1968 , Page(s): 256 - 258
    Cited by:  Papers (8)
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  • On Using the Q of Transmission Lines (Correspondence)

    Publication Year: 1968 , Page(s): 258 - 260
    Cited by:  Papers (1)
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  • Note on Perturbation Analysis of Guided Waves in Inhomogeneous Media (Correspondence)

    Publication Year: 1968 , Page(s): 260 - 261
    Cited by:  Papers (1)
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  • Mode Propagation in Multilayered Dielectric Loaded Waveguides by Ray Theory (Correspondence)

    Publication Year: 1968 , Page(s): 261
    Cited by:  Papers (1)
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  • Comments on "An Improved Method for Measuring Scattering Parameters of Nonreciprocal Two-Ports" (Correspondence)

    Publication Year: 1968 , Page(s): 261 - 262
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  • Note on Reflectometer for Measuring the Magneto-Microwave Kerr Effect in Semiconductors (Correspondence)

    Publication Year: 1968 , Page(s): 262
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  • A New Microwave Low-Pass Structure (Correspondence)

    Publication Year: 1968 , Page(s): 262 - 264
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  • The Minimum Volume of an Equal-Element Bandpass Filter (Correspondence)

    Publication Year: 1968 , Page(s): 264 - 265
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  • On the Scalar Product of Certain Circular and Cartesian Wave Functions (Correspondence)

    Publication Year: 1968 , Page(s): 265 - 266
    Cited by:  Papers (5)
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  • Contributors, April, 1968

    Publication Year: 1968 , Page(s): 267 - 268
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  • G-MTT Symposium [Howard Johnson's New Center Motor Lodge, Delroit, MI, USA. May 20-22, 1968]

    Publication Year: 1968 , Page(s): 269 - 271
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  • Approximation Technique for Dielectric Loaded Waveguides

    Publication Year: 1968 , Page(s): 228 - 233
    Cited by:  Papers (14)
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    An algebraic procedure is described which yields approximate values for the cutoff frequencies and propagation constants of dielectric-loaded waveguides. The procedure is demonstrated for a waveguide completely filled with an anisotropic dielectric and for waveguides partially filled with isotropic dielectrics. For the latter case results are tabulated for five types of waveguide loading. The symmetrically loaded waveguide is used to show the accuracy which may be expected. This procedure is shown to be identical with the Rayleigh-Ritz variational method but with the advantage that it provides a systematic approach to improve the accuracy and to handle a multitude of waveguide geometries. View full abstract»

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  • Noise in Synchronized Oscillators

    Publication Year: 1968 , Page(s): 234 - 240
    Cited by:  Papers (153)  |  Patents (11)
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    Noise in synchronized oscillators is analyzed using a simple oscillator model. It is shown that the FM noise can be considerably improved by synchronization while the AM noise degrades slightly. It is also shown how the noise spectrum becomes unsymmetrical with respect to the synchronizing freqnency when it differs from the free-running frequency. View full abstract»

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  • The Paradoxical Surface Wave (Crack Wave) in Ferrite-Filled Waveguides

    Publication Year: 1968 , Page(s): 241 - 250
    Cited by:  Papers (6)
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    Existing theories that relate to propagation in a rectangular waveguide loaded with a transversely magnetized slab of ferrite are reviewed and new points brought out. In the loss-free case, in which the ferrite stab lies against one of the waveguide walls, conflicting results are obtained. If the width of the air gap between the ferrite slab and the waveguide wall is set equal to zero, a single surface wave propagating in one direction only is predicted. This result leads to a thermodynamic paradox. If, however, the air gap is assumed infinitely small but different from zero, two surface wave modes, which transport energy in opposite directions, are predicted. The aim of this paper is to establish whether or not a surface wave exists when there is no air gap for a real structure which is not free of loss. The experimental results show conclusively that the surface wave is present. It is concluded that a mathematical model is required, which assumes losses. If for reasons of simplicity a lossless model is used, then it must be assumed that the width of the air gap is never identical to zero. The structure selected for the experimental work consisted of a rectangular block of ferrite that completely filled the cross section of an X-band waveguide. View full abstract»

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  • A Miniature High-Q Bandpass Filter Employing Dielectric Resonators

    Publication Year: 1968 , Page(s): 210 - 218
    Cited by:  Papers (39)  |  Patents (2)
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    The miniaturization of high-Q resonant microwave structures is of great importance. This must he done to keep pace with the size reduction of other related components. The need has led to an investigation into the feasibility of using dielectric materials as microwave resonators. This paper deals with the application of the TiO2 dielectric resonator in a narrowband bandpass filter operating in the 2200 to 2300 MHz telemetry band. The study confirms the theory that a bandpass filter employing dielectric resonators is practical to build, is compact, and will approach the performance of an equivalent waveguide filter. The design employed five resonators mounted in a cylindrical tube that was 1.4 inches in diameter by 4.3 inches long and weighed 4.6 ounces. An equivalent waveguide filter would be approximately 2.3x4.5x16 inches long and would weigh approximately 64 ounces (WR-430). The thermal sensitivity of the dielectric resonator employing TiO2 is an inherent problem and oven regulation for narrowband applications will be required. Small, inexpensive thermal jackets are available that will control the filter stability to a value equal to, or better than, that obtained with a filter utilizing aluminum cavities operating in a typical uncontrolled temperature environment. View full abstract»

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  • Variational Method for the Analysis of Microstrip Lines

    Publication Year: 1968 , Page(s): 251 - 256
    Cited by:  Papers (118)  |  Patents (1)
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    This paper reports a method for computing the line capacitance of a microstrip line based on the application of Fourier transform and variational techniques. The characteristic impedance, guide wavelength, and the surface potential distribution in the microstrip line are obtained for a range of structure parameters and the dielectric constant. The results calculated from the expressions developed in the paper are compared with the theoretical results presently available in the literature and good agreement is found. Comparison with available experimental results is also made where feasible. Possible applications and limitations of the method are discussed. View full abstract»

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  • Microwave Bandpass Filters Containing High-Q Dielectric Resonators

    Publication Year: 1968 , Page(s): 218 - 227
    Cited by:  Papers (155)  |  Patents (15)
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    This paper is concerned with dielectric disks used as resonators in microwave bandpass filters. For many years it has been known that modes of resonance occur in isolated dielectric bodies having air boundaries, and that very compact high-Q resonators can be achieved when ε r, is high and tan δ is low. High-purity TiO2 ceramic material, for example, has an ε r about 100, tan δ about 0.0001, and Qu about 10 000. Practical applications of dielectric resonators have previously been limited by insufficient design information. Formulas are derived for the coupling coefficient between adjacent dielectric-disk resonators within a metal waveguide below cutoff. This metal enclosure is necessary for shielding and to prevent radiation loss. Comparisons between theoretical and experimental coupling coefficient values show very good agreement in each of the three bandpass configurations treated in this paper. Techniques of loop and probe coupling to the end resonators of a multiresonator bandpass filter are discussed and methods of supporting the resonators are suggested. The conclusion is made that microwave dielectric resonators offer important size reductions compared to conventional resonators of similar high Q, but that the center-frequency change of the dielectric resonators as a function of temperature is excessive for many applications. Temperature stabilization is one solution, but preferably a material should be developed having electrical characteristics similar to TiO2 ceramic, but with at least an order of magnitude improvement in temperature sensitivity. 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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