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Microwave Theory and Techniques, IEEE Transactions on

Issue 5 • Date May 1971

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  • [Front cover - May 1971]

    Publication Year: 1971 , Page(s): f1 - f2
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  • Table of contents - May 1971

    Publication Year: 1971 , Page(s): 423
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  • The Even- and Odd-Mode Capacitance Parameters for Coupled Lines in Suspended Substrate

    Publication Year: 1971 , Page(s): 424 - 431
    Cited by:  Papers (41)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (715 KB)  

    Static capacitance characterizations are derived for coupled thin-film conductors in the suspended substrate geometry, which includes shielded microstrip as a special case. In particular, a satisfactory treatment of closely coupled and narrow lines is obtained where, because of the dominance of the edge singularity, "mesh point" analyses are inadequate. The present work was carried through to meet the need in interactive design procedures for characterization of a general transmission geometry. For these procedures, algorithms are required that take little storage and are suitable for very rapid calculations. Capacitance formulas are derived from variational series based on conformal transformations, and these series are converted to easily evaluated finite forms. Calculation of the even- and odd-mode fringing capacitances for coupled limes is made for finite line widths assuming a periodic array of lines. The applicability of these capacitances to a single pair of lines and to finite filter arrays has been checked experimentally. Routines for lower bound values of fringing capacitances are given. Upper bound formulations validate the accuracy of the lower bound calculations. View full abstract»

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  • A Design Method for Meander-Line Networks Using Equivalent Circuit Transformations

    Publication Year: 1971 , Page(s): 431 - 442
    Cited by:  Papers (15)
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    Many types of coupled structures are used to design microwave filters and equalizers. One such structure is the array of coupled parallel commensurate conductors called a meander line. There are several analysis techniques that may be used to find the equivalent circuit of a meander line. However, these do not provide exact design equations. In this paper, meander-line networks are analyzed and synthesized using the graph-transformation technique. The equivalent circuits of one- and two-port meander-line networks will be developed by using the transformation method, and it will be shown that meander-line networks can be easily designed by using the electronic computer. View full abstract»

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  • Reciprocal and Nonreciprocal Modes of Propagation in Ferrite Stripline and Microstrip Devices

    Publication Year: 1971 , Page(s): 442 - 451
    Cited by:  Papers (103)  |  Patents (4)
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    An approximate analysis is presented together with a physical description of the modes of propagation in stripline and microstrip devices of significant width, using ferrite slabs as dielectric material, magnetized perpendicular to the ground plane. The dominant mode resembles TEM propagation, except that there is a strong transverse field displacement, causing wave energy to be concentrated along one edge of the line. Nonreciprocal behavior is obtainable by asymmetrically loading the edges. Approximate analytical techniques are given for isolators and phase shifters, with examples of numerical computations and experimental results. View full abstract»

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  • On the Design of Optimum Dual-Series Feed Networks

    Publication Year: 1971 , Page(s): 451 - 458
    Cited by:  Papers (8)
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    A computer-implemented procedure is presented for the design of optimally efficient dual-series feed networks for use in waveguide phased arrays where the network directional couplers are limited in their values of maximum coupling by geometrical and bandwidth requirements. The theory of the design procedure is outlined and results for the design of sum and difference pattern element excitations for typical coupler limitations are presented. View full abstract»

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  • Field Description with Spatial and its Application to Complex Variables Scattering and Waveguide Problems

    Publication Year: 1971 , Page(s): 458 - 474
    Cited by:  Papers (2)
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    The field description with spatial complex variables is proposed. The complex variables z, z/spl overbar/ are chosen, where z= x+iy and z/spl overbar/ is the complex conjugate. A contour integral in a complex plane is and the residue theorem is applied. The variables are changed by a transforming (mapping) function. The field description is applied to the boundary-value problems with arbitrary boundary. An approximate method is developed throughout this paper. It is pointed out that the integration can be performed easily and our analytical effort can be reduced. The two-dimensional scattered fields in free space from the perfectly conducting obstacle with arbitrary cross section are solved under assumption of small size. Furthermore the method is applied to the scattered fields in the rectangular waveguide with an inductive post or a capacitive post. The transmission coefficient and the reflection coefficient are obtained in the general forms which involve the boundary parameters indicating the shape of the boundary. View full abstract»

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  • Diffraction of Electromagnetic Waves by a Conducting Screen Perforated Periodically with Holes

    Publication Year: 1971 , Page(s): 475 - 481
    Cited by:  Papers (33)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (586 KB)  

    The reflection and transmission of a plane wave incident on a thin perfectly conducting screen perforated periodically with circular holes are considered. The spacings between holes may be comparable to or less than the wavelength. The metal screen is assumed to be either backed by a flat dielectric sheet, or sandwiched between two or more dielectric sheets that are used to match the susceptsnce of the screen. The techniques of transmission line analysis and the method of moments are employed to obtain a solution for this general class of boundary-value problems. Numerical results for several cases of interest in both X and Ku bands were obtained and shown to be in good agreement with experimental measurements. View full abstract»

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  • Noise Figure for a Mixer Diode (Correspondence)

    Publication Year: 1971 , Page(s): 481
    Cited by:  Papers (2)
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    Equations are presented for the noise figure of a mixer using a resistive diode. These results are more general than those presented previously by Barber. View full abstract»

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  • Two-Cavity Ring-Type Channel-Dropping Filters for a Millimeter-Wave Guided Wave Communication System (Correspondence)

    Publication Year: 1971 , Page(s): 481 - 484
    Cited by:  Papers (7)
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    Newly developed two-cavity ring-type filters for a millmeter-wave communication system are described. They are used in a five-channel transmit and receive multiplexer which operates in the 50-GHz frequency band. The pulse response and interchannel crosstalk characteristics for 250-Mbit PCM-AM or PCM-PSK transmission were calculated and compared with experimental results. View full abstract»

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  • Use of Finite Difference Approximations to Partial Differential Equations for Problems Having Boundaries at Infinity (Correspondence)

    Publication Year: 1971 , Page(s): 484 - 486
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (349 KB)  

    A computationally simple technique is presented for solving finite difference equations arising from potential problems, part of whose boundary is at infinity. The procedure makes use of an arbitrary "fictitious" boundary drawn close to the regions of physical interest. An initial guess is made of the potential on this boundary as well as at all interior points. Well-known iterative techniques are used to correct the values of the interior potentials. Meanwhile the potentials on the boundary are corrected iteratively by recalculating them from the sources or charges in the entire region, which in turn are calculated from the current iteration of the interior potential. The technique is valid even if parts of the physical structure, such as an air-dielectric interface in microstrip, extend toward infinity. The fictitious boundary need not include all of the structure, providing the rate of falloff of the sources outside the boundary is known. View full abstract»

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  • New Design Equations for a Class of Microwave Filters (Correspondence)

    Publication Year: 1971 , Page(s): 486 - 490
    Cited by:  Papers (16)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (617 KB)  

    New approximate design equations for a class of microwave bandpass filters are presented. The filters are 1) dual forms of half-wave parallel-coupled resonator filters, 2) one form of interdigital filter, and 3) dual forms of direct-coupled stub filters. The advantages derived from using the new equations are 1) exact realization of the specified design bandwidth and 2) improved pass-band voltage standing-wave ratio (VSWR) response in the vicinity of band edge. Experiments data are presented for a trial filter design having 7 resonators, 40-percent bandwidth, and passband VSWR of 1.2. View full abstract»

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  • Some Considerations About the Diffraction Loss of Open Resonators (Correspondence)

    Publication Year: 1971 , Page(s): 490 - 491
    Cited by:  Papers (3)
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    The concept of "effective" number of Fresnel zones is used in order to discuss some properties of the losses of the open resonators, as functions of the resonator geometry. The cases of the flat-roof resonator and the step-rim resonator are discussed in detail. View full abstract»

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  • Integrated Parametric Amplifier Module with Self-Contained Solid-State Pump Source (Correspondence)

    Publication Year: 1971 , Page(s): 491 - 493
    Cited by:  Patents (1)
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    Three completely integrated S-band parametric amplifier modules, of a type ultimately suitable for spaceflight applications, have been constructed and tested. Each consists of a single-stage thin-film-microstrip 2.25-GHz parametric amplifier, closely integrated with a waveguide-mounted isolator-coupled 14-GHz Gunn-effect pump oscillator in a 6-in/sup 3/ aluminum housing weighing less than 0.6 lb. The pertinent measured characteristics of the three modules include: 2.25-GHz center frequency, 15-dB maximum gain, 76-90-MHz 1-dB bandwidth, and 139-170/spl deg/ K passband temperature. View full abstract»

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  • Performance Limitations of Lossy Circulators (Correspondence)

    Publication Year: 1971 , Page(s): 493 - 494
    Cited by:  Papers (2)
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    For lossy circulators which are not too far from the ideal circulator important necessary inequalities for the insertion loss which constitute interesting performance limitations are derived approximately. The case of semi-ideal circulators is discussed briefly and the validity of the approximations is estimated. View full abstract»

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  • Computation of Lumped Microstrip Capacities by Matrix Methods - Rectangular Sections and End Effect (Correspondence)

    Publication Year: 1971 , Page(s): 495 - 497
    Cited by:  Papers (29)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (291 KB)  

    The method of moments is applied to three-dimensional microstrip problems to calculate lumped (or excess) capacitance. As examples, the capacitance of open-circuited microstrip lines and the capacitance of rectangular microstrip sections are computed. The open-circuit data are basic to any three-dimensional problem. The method is a general one and can be used to compute the lumped capacitance of any microstrip discontinuity, such as bends and T junctions. View full abstract»

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  • A Time-Delay Equalizer Using Directional Filter Cascades (Correspondence)

    Publication Year: 1971 , Page(s): 497 - 498
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    In the millimeter-wave waveguide system considered for long-distance communication, the dispersive nature of the circular electric TE/sub 01/ mode can produce severe pulse distortion. To correct this problem, equalization of the guide delay distortion characteristic at the intermediate frequency is being considered. This correspondence shows that directional filter cascades are, in theory, capable of performing the required function. View full abstract»

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  • Contributors, May 1971

    Publication Year: 1971 , Page(s): 498 - 499
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  • Information on computer program descriptions

    Publication Year: 1971 , Page(s): 500
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  • Membership application

    Publication Year: 1971 , Page(s): 501
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  • Symposium Digest order blank

    Publication Year: 1971 , Page(s): 502
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  • [Back cover]

    Publication Year: 1971 , Page(s): b1 - b2
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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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