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Microwave Theory and Techniques, IEEE Transactions on

Issue 1 • Date January 1970

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Displaying Results 1 - 25 of 32
  • [Front cover - Jan. 1970]

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

    Publication Year: 1970 , Page(s): 1
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  • Comment on "Synthesis of Symmetrical Branch-Guide Directional Couplers" [Correspondence]

    Publication Year: 1970 , Page(s): 47 - 48
    Cited by:  Papers (3)
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    This note considers the approximation problem encountered in the synthesis of branch-guide couplers. An alternate solution to that proposed by R. Levy and L. F. Lind is considered and shown to give generally inferior performance. It is inferred then, that an important design criterion is the requirement that the passband of the coupler contains the maximum number of frequencies of perfect match consistent with elements that are a quarter-wave-length long at midband. View full abstract»

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  • Contributors, Jan. 1970

    Publication Year: 1970 , Page(s): 75
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    Freely Available from IEEE
  • Computer program descriptions

    Publication Year: 1970 , Page(s): 76
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    First Page of the Article
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  • [Back cover]

    Publication Year: 1970 , Page(s): b1 - b2
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    Freely Available from IEEE
  • New Design Technique for Stable Wide-Band Tunnel-Diode Amplifier (Correspondence)

    Publication Year: 1970 , Page(s): 52 - 54
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    It is verified experimentally and theoretically that highly reflective out-of-band characteristics are inherent in the usual stripline circulator, and follow a certain regularity. It is then described how a small-sized additional network to the circulator can improve its out-of-band characteristics. Using the improved circulator with this network, it is shown how to design a small-size wide-band TDA. View full abstract»

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  • Calculation of Coefficients of Capacitance of Multiconductor Transmission Lines in the Presence of a Dielectric Interface

    Publication Year: 1970 , Page(s): 35 - 43
    Cited by:  Papers (154)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (904 KB)  

    A method is given for the numerical determination of the coefficients of capacitance for a class of multiconductor transmission-line systems. This class includes systems without ground planes, or with one or two ground planes, with the lines embedded in one or two layers of dielectrics. The conductors can be of any cross section that can be approximated adequately by polygons. The method is a refinement of the subareas method in which the assumption of a "staircase function" surface charge density, that is, constant charge density over each subarea, is replaced by the assumption of a piecewise linear charge density over the conductor surfaces, and the charge density parameters are determined by making a least-squares fit to the potential to the boundary conditions of the problem. View full abstract»

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  • Guided Waves in a Class of Stripline and Other Parallel-Plate Structures (Correspondence)

    Publication Year: 1970 , Page(s): 66 - 68
    Cited by:  Papers (1)
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    The dominant mode of the open-sided shielded stripline is TEM and has rightly received considerable attention. Few analyses of its non-TEM properties are available. Oliner and Samuilov have assumed the existence of higher order modes and calculated cutoff frequencies through a transverse resonance approach. Brackelmann et al. have made computations through series-matching, and report that non-TEM modes do not exist for open-sided shielded stripline. Bolle and Eaves, through a Wiener-Hopf technique, have made calculations that substantiate this. Ilenborg and Pregla have made calculations through series matching for a stripline of two strips and report H modes. However, such numerical results allow strict conclusions only for the specific parameters chosen, and, furthermore, the conclusions are subject to computational error. These practical considerations along with the aesthetic make a non-numerical investigation desirable. It will be shown that the shielded stripline, and indeed a general class of parallel-plate waveguide structures, do not support non-TEM modes. View full abstract»

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  • Thin Skin IMPATTS (Correspondence)

    Publication Year: 1970 , Page(s): 72 - 74
    Cited by:  Papers (15)
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    This correspondence summarizes some consequences of "skin effect" for high-frequency IMPATT diodes. The enormous current densities, well in excess of 105 A/cm2, currently employed in high-frequency IMPATT diodes are shown to cause nonuniform current distributions due to skin effect in diodes of conventional dimensions. These nonuniformities in turn preclude high efficiency. They also provide an explanation for the small increase in output power attained in pulse operation, in which even higher current densities are experienced than in CW operation. Practical means of reducing these effects exist within semiconductor technology and are briefly discussed. View full abstract»

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  • Varactor-Tuned Avalanche Transit-Time Oscillator with Linear Tuning Characteristics (Correspondence)

    Publication Year: 1970 , Page(s): 44 - 45
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (312 KB)  

    A circuit is described which uses an abrupt junction varactor to electronically tune an IMPATT oscillator. Linear voltage frequency tuning is obtained over a 10 percent frequency band. View full abstract»

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  • A New Type of Quasi-Optical Waveguide Component (Correspondence)

    Publication Year: 1970 , Page(s): 57 - 58
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    A new form of quasi-optical waveguide component has been designed that is based on use of the Brewster angle and on the rapid variation of reflectance and change of phase near the critical angle. An attenuator was built in S-band waveguide and its performance measured at 35 and 94 GHz. Diffraction is the limiting factor on the device operation, so practical device applications will likely be limited to 1-mm wavelengths and less. View full abstract»

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  • Analysis and Design of a Microwave Transistor Active Filter

    Publication Year: 1970 , Page(s): 2 - 9
    Cited by:  Papers (39)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (864 KB)  

    In this paper "inverted common collector" transistor resonator filters will be analyzed. Simple formulas will be presented for the input immittance parameters, in terms of the bridged-T equivalent network and in terms of the common-emitter Y parameters. A design procedure is suggested, and a design example given. Stability of the resultant circuitry is discussed. View full abstract»

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  • Phase Characteristics of a Circularly Symmetric Dual-Mode Transducer (Correspondence)

    Publication Year: 1970 , Page(s): 69 - 71
    Cited by:  Papers (3)  |  Patents (1)
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    This correspondence deals with the analysis and measurement of TE11 ° → TM11 ° mode conversion by circularly symmetric transducers in a circular waveguide. Two types are considered, the simple step change in radius and a discontinuity covered by a dielectric ring. For the first type, experimental results for both amplitude and phase are compared with predictions made on the basis of a computer program, with excellent agreement. The dielectric loaded transducer is of great interest since measurements have shown that such a device can be designed to launch the two modes with a relative amplitude and phase which is essentially independent of frequency over a very wide range. This configuration is therefore an excellent candidate for use in low-noise microwave antenna systems. View full abstract»

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  • H Guide with Laminated Dielectric Slab

    Publication Year: 1970 , Page(s): 9 - 15
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (720 KB)  

    A consideration of the field distribution and the characteristics of an H guide with a laminated dielectric bar composed of an arbitrary number of dielectric strips separated by air layers is presented. Low-loss wave modes with the electric field intensity predominantly parallel to the sidewalls are analyzed. Approximate thin-layer equations are derived which indicate methods for improvements of the attenuation of the H guide. View full abstract»

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  • A Plasma Video Detector (Correspondence)

    Publication Year: 1970 , Page(s): 64 - 65
    Cited by:  Papers (11)
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    A low-noise microwave detector has been developed for use with high CW carrier power and low modulation frequency. Under some conditions, the sensitivity and noise temperature of this device are better than those exhibited by the best crystal video detectors. View full abstract»

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  • Wood Anomalies in Diffraction from Strip Grating (Correspondence)

    Publication Year: 1970 , Page(s): 54 - 55
    Cited by:  Papers (3)
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    In this correspondence, numerical calculations have been carried out for the reflection and transmission coefficients of various order fields scattered from strip gratings. The work is based on an integral equation formulation followed by Galerkin's method of solution. The results exhibit the occurrence of Wood anomalies at the so-called Rayleigh wavelengths. View full abstract»

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  • Millimeter-Wave Directional Filter (Correspondence)

    Publication Year: 1970 , Page(s): 61 - 62
    Cited by:  Papers (2)
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    This correspondence describes experimental results in the 50-GHz band on one-resonator and two-resonator maximally flat directional filters. The center frequencies of these filters can be smoothly changed over a wide range by means of two kinds of novel tuning mechanisms. View full abstract»

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  • Computer-Aided Design of Three-Port Waveguide Junction Circulators

    Publication Year: 1970 , Page(s): 25 - 34
    Cited by:  Papers (18)
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    The complete performance of a lossless three-port H-plane waveguide junction loaded coaxially with various inhomogeneous ferrite cylanders has been evaluated over the waveguide bandwidth and compared with experiment. Qualitative agreement between the predicted and measured performance was generally good using only the first three modes, n=0±1. It has been shown theoretically and verified experimentally that if the 4πMs of a homogeneous rod or the internal field is increased, the circulation frequency f0 increases; conversely, if the pemittivity is increased, f0 decreases. These conflicting effects are modified when the magnetization 4πMs and permittivity ε are inhomogeneous. For example, if the 4πMs(γ) is small at the outer surface of the rod (with permittivity held constant), the effect on f0 is very small; but if 4πMs(spl gamma) approaches zero for γ small, then f0 may decrease significantly. On the other hand, if ε/subγ/(γ) approaches unity near the outer surface of the rod, f0 may increase significantly; but if ε/subγ/(γ) approaches unity near the center of the rod, f0 is affected relatively little. The inhomogeneous structure has also shown that decreasing the ferrite volume may improve the performance, and high-power applications are suggested. With a conducting pin down the center of the ferrite, relative bandwidths of 40-50 percent are predicted. View full abstract»

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  • Broad-Band High IF Mixers Based on Magic T's (Correspondence)

    Publication Year: 1970 , Page(s): 58 - 60
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (424 KB)  

    This correspondence describes the design of a high intermediate frequency mixer based on the use of a broad-band stripline magic T. Advantages of the design include the ability to process RF signals down to the upper IF band edge without diplexer crossover loss. Experimental results are presented. View full abstract»

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  • Minimum Principle Determination of Equivalent Parameters of Microwave Structures (Correspondence)

    Publication Year: 1970 , Page(s): 60 - 61
    Cited by:  Papers (2)
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    A variational bound (minimum) principle originally introduced in quantum mechanical scattering problems is here adapted to the scattering of electromagnetic waves by a nonsymmetric obstacle in a rectangular waveguide. Numerical results are given for a simple case. View full abstract»

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  • Power Combiner Nomograms (Correspondence)

    Publication Year: 1970 , Page(s): 71 - 72
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    A set of three nomograms yields directly the phase and amplitude of the output signal in terms of the two input signals for an ideal and symmetric hybrid combiner. View full abstract»

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  • An Orthogonal Coordinate System for Curved Pipes (Correspondence)

    Publication Year: 1970 , Page(s): 69
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (144 KB)  

    To facilitate the study of wave propagation along curved structures, such as curved waveguides and antennas, it is desirable to have an orthogonal coordinate system for an arbitrary smooth curve. Such a coordinate system can be derived from the Serret-Frenet frame of the curve. View full abstract»

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  • Characteristic Impedance of Microstrip by the Method of Moments (Correspondence)

    Publication Year: 1970 , Page(s): 65 - 66
    Cited by:  Papers (22)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (264 KB)  

    The "method of moments" is used to calculate the capacity per unit length of a microstrip transmission line. The characteristic impedance is obtained by assuming TEM mode of propagation. The values of the impedance calculated by this method are in good agreement with the results reported by Wheeler and Sobol. View full abstract»

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  • Even and Odd Mode Impedance of Coupled Pairs of Microstrip Lines (Correspondence)

    Publication Year: 1970 , Page(s): 55 - 57
    Cited by:  Papers (3)
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    Even mode impedances of coupled pairs of microstrip lines have been computed, and corresponding odd mode impedances have been empirically estimated. The analysis is based on the superposition of solutions for single rnicrostrip lines. 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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