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Microwave Theory and Techniques, IEEE Transactions on

Issue 2 • Date Feb. 1980

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  • [Front cover - Feb. 1980]

    Publication Year: 1980 , Page(s): f1 - f2
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  • Comments on "Microstrip Characteristic Impedance" [Letters]

    Publication Year: 1980 , Page(s): 152
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    In a recent paper Getsinger considers some definitions of microstrip characteristic impedance which are usual in literature and which have been analyzed by us in order to show their different behavior with the frequency. In particular, Getsinger states that only one of these definitions is correct, that is, the one based on the wave-impedance concept, while the others must be neglected. View full abstract»

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  • Contributors, Feb. 1980

    Publication Year: 1980 , Page(s): 154 - 157
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  • IEEE Journals on Microfilm

    Publication Year: 1980 , Page(s): 158
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  • Membership application

    Publication Year: 1980 , Page(s): 159
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  • IEEE Standard Dictionary of Electrical and Electronics Terms [advertisement]

    Publication Year: 1980 , Page(s): 160
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  • [Back Cover - Feb. 1980]

    Publication Year: 1980 , Page(s): b1
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  • Coupled Microstrip Disk Resonators

    Publication Year: 1980 , Page(s): 94 - 97
    Cited by:  Papers (3)
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    The coupling between microstrip disk resonators is investigated analytically and experimentally. The interaction between the printed disks is modeled by a gap capacitance, which is computed by solving the corresponding electrostatic problem. An integral equation is used to determine the nonsymmetric charge distribution on the disk resonators. Numerical results are presented for several cases. For a specific case the prediction of the theory is compared with the experiment. View full abstract»

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  • Slot-Line Parameters (Computer Program Description)

    Publication Year: 1980 , Page(s): 153
    Cited by:  Papers (1)
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    The program calculates guide wavelength and characteristic impedance of a slot line as a function of physical dimensions, substrate permittivity, and frequency. View full abstract»

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  • Effects of Fringing Fields on the Capacitance of Circular Microstrip Disk

    Publication Year: 1980 , Page(s): 98 - 104
    Cited by:  Papers (56)
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    The effects of fringing fields on the capacitance of a circular microstrip disk are studied with the dual integral equation formalism for practical microstrip circuits when the substrate thickness is small. Approximations as well as exact numerical evaluations are made in the calculation of the capacitance. With a seminumerical approach, an approximate formula for the capacitance is obtained and shown to yield accurate results with the simple use of a calculator. Asymptotic lower bound and exact numerical computations are also carried out. The various techniques are illustred and compared with numerical results. View full abstract»

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  • A Broad-Band Model for a Coaxial-to-Stripline Transition

    Publication Year: 1980 , Page(s): 130 - 135
    Cited by:  Papers (2)
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    This paper investigates a significant source of error encountered when characterizing a circuit element embedded in a stripline circuit at microwave frequencies. The errors introduced by the coaxial-to-stripline transition are examined and a frequency-independent model is developed for the transition over the band 2-12 GHz. The usefulness of the model is demonstrated experimentally by measuring a known load consisting of a short length of high-impedance line terminated in a short circuit. View full abstract»

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  • Analysis of a Microstrip Covered with a Lossy Dielectric

    Publication Year: 1980 , Page(s): 104 - 109
    Cited by:  Papers (43)  |  Patents (2)
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    The analysis of a microstrip line covered with a low-loss sheet material is presented in this paper. Numerical results show that the characteristics of a microstrip covered with a thick sheet of high dielectric constant are drastically affected. The effect is more for small values of W/h ratio. A closed-form expression for the dielectric loss of a multilayer structure is derived.The extension of present method to high-loss materials is also discussed. Numerical and experimental results for effective dielectric constant of a microstrip covered with low- and high-loss sheet materials are compared and found to be in good agreement. View full abstract»

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  • Scattering and Mode Conversion of Guided Modes by a Spherical Object in an Optical Fiber

    Publication Year: 1980 , Page(s): 137 - 141
    Cited by:  Papers (4)
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    The scattering and the mode conversion of the guided modes due to a spherical object in a step-index optical fiber is analyzed theoretically. The incident fiber mode is expanded in terms of the spherical vector wave functions, and the scattered fields are obtained by applying the boundary conditions on the surface of the object with the aid of these expansions. The expression for the total scattered power and the mode conversion coefficients are given. As an example, the scattering and mode conversion caused by a spherical air bubble are evaluated numerically. View full abstract»

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  • Microstrip Transmission Line with Finite-Width Dielectric

    Publication Year: 1980 , Page(s): 90 - 94
    Cited by:  Papers (27)
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    The results of a numerical solution for open microstrip transmission line with finite-width dielectric are presented for a quasi-TEM computational model. The related solution is based on moment methods using equivalent source models for the free and bound charges existing on boundary surfaces. Characteristic impedance and velocity of propagation are presented in graphical form for estimating the effects of dieletric truncation on microstrip circuits and for related circuit design. View full abstract»

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  • Response to Comments on "Microstrip Characteristic Impedance"(Letters)

    Publication Year: 1980 , Page(s): 152
    Cited by:  Papers (1)
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    Bianco et al. [1] have performed a service in pointing out that microstrip characteristic impedance definitions employing voltage-current-power ratios can be functionally inconsistent. The purpose of my note was to show that such definitions are also inconsistent (with one coincidental exception) with the unifying concept of wave impedance [2], which embraces the impedances of the modes of TEM lines, hollow waveguides, and other structures. View full abstract»

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  • Techniques for Broad-Banding Above Resonance Circulator Junctions without the Use of External Matching Networks

    Publication Year: 1980 , Page(s): 125 - 129
    Cited by:  Papers (10)
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    By using a modification of Bosma's approach, a theoretical explanation is given for the broad-banding effect wich can be achieved by the use of three open-circuited stubs on the center conductor circumference of above resonance circulators. It is also shown that similar broad-banding can be achieved by the use of materials with very large values of 4piMs in the above resonance state. It appears that the frequency dependence of the conductance G(omega) is a limiting factor in the bandwidth improvements that can be obtained in these ways. View full abstract»

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  • Coupled TEM Microstrip Impedance Transformer for S-Band TRAPATT Amplifiers

    Publication Year: 1980 , Page(s): 119 - 125
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    A coupled TEM microstrip line circuit suitable for use in S-band TRAPATT amplifiers has been investigated. An analytical model of the coupled-line structure has been developed which properly accounts for diode positioning on the line. This model has been used to calculate the fundamental and harmonic impedances at the device terminals for various stub terminations and device locations. Measurements made with a Hewlett-Packard network analyzer are in good agreement with the calculated results. The use of this circuit for the development of a fixed-tuned MIC circuit for the TRAPATT amplifier on Duroid Substrate is discussed. The complete circuit incorporates a bias line filter with this coupled microstrip line and appropiate harmonic tuning stubs at two of its ports. It is capable of providing at least 6-percent 1-dB bandwith with high efficiency and high peak power output over pulsewidths up to 50 mu s and up to 1-percent duty cycle. View full abstract»

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  • Variational Treatment of the Diffraction at the Facet of d.h. Lasers and of Dielectric Millimeter Wave Antennas

    Publication Year: 1980 , Page(s): 61 - 73
    Cited by:  Papers (19)
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    This paper presents an accurate variational treatment of the diffraction of TE and TM waves by an abrupt transverse discontinuity in a dielectric waveguide, such as the mirror of a double heterostructure (d.h.) injection laser, or the end plane of a dielectric slab antenna for millimeter waves, under the assumption of small aspect ratio. A matrix representation of the Green's function is derived analytically, in the limit of small efective frequency, for the TE case. For the TM case, the complication introduced by the discontinuity of the transverse electric field across the dielectric interface is discussed in detail. The numerical examples refer to the d.h. laser configuration. Both transverse directions (perpendicular as well as parallel) to the junction are studied. The effect of mode coupling at the mirror of a LOC laser as well as the effect of an antireflection coating are investigated. View full abstract»

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  • A K-Band Ruby Maser with 500-MHz Bandwidth (Short Papers)

    Publication Year: 1980 , Page(s): 149 - 151
    Cited by:  Papers (3)
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    Engineering improvements to a previously described reflected- wave maser design have resulted in an instantaneous 3-dB band-width of 400 MHz at 19.5 GHz, increasing to 560 MHz at 24 GHz. Nominal gain is 27 to 31dB and gain flatness is ±2.5 dB over this tuning range. Noise temperature variation across the passband is less than ±1.5 K and the effective noise temperature referred to the room temperature input flange ranges from 9.5±4 K to 13.5±4 K over the 18.5- to 25-GHz tuning range. View full abstract»

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  • Varactor Properties for Wide-Band Linear-Tuning Microwave VCO's

    Publication Year: 1980 , Page(s): 110 - 119
    Cited by:  Papers (7)
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    Varactor properties and a particular hyperabrupt doping profile are identified which can provide wide-band tuning linearity for an important class of microwave oscillators. The results are most appropiate for series-tuned oscillators realized with simple configurations of BJT's or FET's in chip, integrated, or monolithic form with low parasitics. The derivation for the doping profile is presented and includes the effects of large signals in modifying the effective varactor capacitance. In addition, breakdown conditions and the level and variation in series resistance are included. When the results are applied to BJT and FET oscillator circuits with measured large-signal properties, the profiles obtained predict excelent linearity for the FET over a 7-12-GHz frecuency range and fair linearity for the BJT circuit from 2 to 4 GHz. The profiles are reasonable and should be realizable with existing varactor fabrication technology. View full abstract»

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  • A Theoretical Basis for Microwave and RF Field Effects on Excitable Cellular Membranes

    Publication Year: 1980 , Page(s): 142 - 147
    Cited by:  Papers (5)
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    A model of a mechanism for nonthermal interaction of RF or microwave fields with excitable cellular membranes is presented. It may be possible for an oscillating component of membrane potential to change the conductance of the membrane to all ion species which transverse voltage-dependent membrane channels. Some specific effects on squid giant axon predicted by the model are discussed. View full abstract»

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  • Propagation Along a Coaxial Cable with a Helical Shield

    Publication Year: 1980 , Page(s): 84 - 89
    Cited by:  Papers (16)  |  Patents (1)
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    A leaky coaxial cable is modelled by a dielectric coated conductor shielded by a finite number of unidirectional helical wires. A modal equation is derived and soIved numerically for the propagation constants of both the monofilar and bifilar modes. Numerical results are also presented for the effective surface transfer impedance of the shield. This parameter is found to depend, in general, on the propagation constant. View full abstract»

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  • Easy Determination of the Characteristic Impedance of the Coaxial System Consisting of an Inner Regular Polygon Concentric with an Outer Circle (Short Papers)

    Publication Year: 1980 , Page(s): 147 - 149
    Cited by:  Papers (1)
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    This paper gives a simple method for the determination of the characteristic impedance of an inner regular polygon concentric with an outer circle. The approach makes use of the method of superposition for plane sheets of charge which were radially disposed in the polygon. The results are in good agreemnt with those obtained by Laura and Luisoni. View full abstract»

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  • Transmission-Line Conductors of Various Cross Sections

    Publication Year: 1980 , Page(s): 73 - 83
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1008 KB)  

    The inner or outer conductor of an RF transmission line may have a noncircular shape of cross section, in which case it can be ascribed an effective radius which is valid if the two conductors are sufficiently separated (as by the ratio of radii). Moreover, there are some combinations of inner and outer conductors whose wave resistance can be evaluated exactly. These can be used to test the approximation of the effective radii. There are some unique shapes of combinations which have binary submultiples of 377 ohms wave resistance because the field pattern of each can be mapped on a set of squares. A variety of cross sections are described and evaluated, with due reference to their sources. They are related by conformal transformations, which are indicated but not derived. One example is an inner conductor whose cross section is a rectangle with rounded edges. One family is based on the crescent or biangle formed of two circular arcs between two angles. 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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