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Microwave Theory and Techniques, IEEE Transactions on

Issue 12 • Date Dec. 1980

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  • [Front cover - Dec. 1980]

    Publication Year: 1980 , Page(s): f1 - f2
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  • 1980 Index, IEEE Transactions on Microwave Theory and Techniques, Vol. MTT-28

    Publication Year: 1980 , Page(s): i1 - i16
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  • Table of contents - Dec. 1980

    Publication Year: 1980 , Page(s): i - ii
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  • [Back cover]

    Publication Year: 1980 , Page(s): b1
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  • The Traveling-Wave Divider/Combiner

    Publication Year: 1980 , Page(s): 1468 - 1473
    Cited by:  Papers (9)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (840 KB)  

    A new kind of distributed power divider/combiner circuit for use in octave (or more) bandwidth microstrip power transistor amplifiers is presented. The design, characteristics and advantages are discussed. Experimental results on a four-way divider and divider/combiner are presented and compared with theory. First experimental results on a six-way traveling-wave divider (TWD) are also presented. View full abstract»

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  • Electromagnetic-Energy Deposition in an Inhomogeneous Block Model of Man for Near-Field Irradiation Conditions

    Publication Year: 1980 , Page(s): 1452 - 1460
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (664 KB)  

    The plane-wave spectrum approach is used to calculate the electromagnetic-energy deposition and its distribution in a 180-cell, inhomogeneous block model of man for a prescribed two-dimensional Ieakage electric field generated by RF sealers and other electronic equipment. The whole-body-averaged energy dose increases approximately as (Delta21Delta22/Lamda4) to the asymptotic plane-wave value, where Delta /sub1//Lamda and Delta/sub2//Lamda are the vertical and horizontal widths (in wavelengths) of the best fit half-cycle cosine functions to the prescribed leakage fields. The effect of phase variations shows that the worst case (maximum deposition) is always obtained for constant phase in the prescribed fields. The need for exact phase measurements is, therefore, obviated since the upper bound on the deposited energy is often the desired quantity. View full abstract»

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  • A Least Squares Solution for Use in the Six-Port Measurement Technique

    Publication Year: 1980 , Page(s): 1473 - 1477
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (456 KB)  

    Although based on the use of simple amplitude detectors, it is possible to obtain complex values of reflection coefficient, via the six-port technique, from the intersection of three circles in the complex plane. In a typical case, the circle centers are detemined primarily by the six-port design and are nominally constant, while the radii are proportional to the square root of the ratio of the output of three of the detectors to a fourth one. As a practical matter, however, these circles will not intersect in a point because of noise or other errors in the detectors.This paper develops a presedure for choosing Gamma in this context. Moreover, the question of what may be inferred about the system performance from the extent of this intersection failue is briefly considered. View full abstract»

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  • 1-W Millimeter-Wave Gunn Diode Combiner

    Publication Year: 1980 , Page(s): 1460 - 1463
    Cited by:  Papers (11)
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    A simple modular approach for combining many Gunn devices has been developed. By cascading the two diode wafer modules, output power of 1 W was achieved in the 45-GHz range from eight Gunn devices with combining efficiency greater than 90 percent. The overall dc-to-RF conversion efficiency of the eight-diode combiner was about 2 percent. The circuit adjustment was easy and no spurious oscillations were observed during the experiment. View full abstract»

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  • Trapped Image Guide For Millimeter-Wave Circuits

    Publication Year: 1980 , Page(s): 1433 - 1436
    Cited by:  Papers (24)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (592 KB)  

    A novel dielectric waveguide is proposed for use in millimeter-wave integrated circuits, and a simple analysis for dispersion characteristics is developed. Numerical results agree reasonably with measured data. Radiation loss of this waveguide at curved sections are proven to be considerably Iess than those of the image guide. As an application of this waveguide, a leaky-wave radiator has been tested. View full abstract»

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  • Circular-Electric Mode and Junctions for Waveguide Couplers Use in Gyrotron Traveling-Wave Amplifiers

    Publication Year: 1980 , Page(s): 1477 - 1481
    Cited by:  Papers (3)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    Recent gyotron traveling-wave amplifier experiments in the TE° / sub 01/ mode have led to the developing of 2-port and 4-port devices potentially useful as input couplers, severs, and beam-RF separators for colletor designs.The couplers are moderately wide-band, have high transmission efficiencies and low reflection coefficients. In addition, they are relatively easy to construct. We present analytical and experimental results. View full abstract»

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  • The 1980 MTT-S International Microwave Symposium

    Publication Year: 1980 , Page(s): 1402 - 1410
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    The 1980 International Microwave Symposium, related workshops, and exhibitions were held at the Shoreham Hotel, Washington, DC, during the week of May 26-May 30, 1980. As has been the case in the past few years, the Symposium is continuing to grow. Approximately 1000 people attended the Symposium and workshops while an additional 450 people registered for the exhibitions. View full abstract»

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  • Corporate and Tandem Structures for Combining Power from 3N and 2N+ 1 Oscillators

    Publication Year: 1980 , Page(s): 1428 - 1432
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (440 KB)  

    The output power from three Gunn oscillators was combined using a short-slot coupler in conjunction with high-level injection locking with the power combining efficiency of ahout 100 percent at 9.7 GHz. Using the 3-oscillator structure as the building block, we constructed (32 = )9-oscillator corporate structure and (2X4+1=)9- and (2X6+1 = )13-oscillator tandem structures to demonstrate power combining efficiencies of 92, 95, and 93 percent, respectively, at 9.6 GHz. View full abstract»

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  • A New Microstrip Radiator For Medical Applications

    Publication Year: 1980 , Page(s): 1464 - 1469
    Cited by:  Papers (47)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (640 KB)  

    Ring-type microstrip antennas appear to offer important advantages in medical therapy when used for local tissue heating. In designing these radiators, the properties of a microstrip covered with layers of lossy dielectric representing various tissue layers have to be taken into account. This paper provides basic information on design of ring-type radiators for tissue heating and the experimental results for a unit designed to operate in the TM modes at 2.45 GHz. The radiator is well matched when spaced 1.3-3 mm from muscle tissue or muscle tissue covered by a thin layer of fat tissue. A limited volume of muscle tissue is heated at a greater rate than the fat layer as shown by a thermographic technique. View full abstract»

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  • Editors's Overview

    Publication Year: 1980 , Page(s): 1401
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    This issue presents a collection of papers from the 1980 International Microwave Symposium which were expanded to provide even more substantial contributions to the technical literature than those which appeared in the Symposium Digest. Also included are summaries of the Symposium functions, including the technical program, exhibits, social programs, and members of the Steering and Program Committees. Special attention is given to those who were honored at the awards ceremony. View full abstract»

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  • Bandpass Filters Using Parallel Coupled Stripline Stepped Impedance Resonators

    Publication Year: 1980 , Page(s): 1413 - 1417
    Cited by:  Papers (250)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (416 KB)  

    Approximate design formulas for bandpass filters using parallel coupled stripling stepped impedance resonators (SIR) are derived. The formulas take into account the arbitrary coupling length as well as quarter-wavelength coupling. Some advantages of this filter are its abilities to control spurious response and insertion loss by changing the structure of the resonator. Using the design formulas two experimental filters were designed and fabricated and their performances closely matched design data. View full abstract»

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  • Mode Coupling And Power Transfer In A Coaxial Sector Waveguide With A Sector Angle Taper

    Publication Year: 1980 , Page(s): 1482 - 1486
    Cited by:  Papers (1)
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    We report a theoretical study of mode coupling and power transfer in a coaxial sector taper. The power transferred from the desired TE 01 mode into other propagating modes is calculated as a function of taper length and operating frequency. Power transfer via mode coupling involves at least three other modes: TE21, TE/sub22/, and TM/sub21/. Power transfer as a function of final sector angle is also shown. At sector angles greater than 180° the taper is highly over-moded. This type of waveguide taper is utilized to feed a wide-band input coupler for gyrotron traveling wave amplifiers. View full abstract»

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  • A Novel Approach To The Design Of Multiple-probe High-power Microwave Automatic Impedance Measuring Schemes

    Publication Year: 1980 , Page(s): 1422 - 1428
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (768 KB)  

    Starting with a modified look at the phasor diagram of a multiple-probe system on a lossless waveguide, one can attain a geometrical method for designing various direct-reading microwave impedance-measuring schemes using fixed probes. This geometrical method will bypass a significant amount of algebraic complexity as encountered in classical algebraic methods. Hence it allows one to visualize the physical picture more clearly and guides one to modify the design more effectively to meet higher performance demands. This article reports a trend of design developments derived from this new point of view. It starts with the analysis of a two-probe system for measuring an unknown impedance /bar z/. This is followed by modifications on the design guided by the new geometrical technique. Finally, two practical designs are derived for measuring an unknown microwave impedance automaticaly. One is to be used under fixed-frequency, swept-power conditions, and the other, under swept-frequency, swept-power conditions. These systems require only inexpensive low-frequency signal processors (either analog or digital) and fixed multiple probes. The output can be either analog with polar display or digital with accurate readouts. To the author's knowledge these designs have not been derived in the past using multiple probes. A critical review on all multiple-probe systems reported in the literature is also discussed with their comparison to the present system. View full abstract»

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  • 1979 MTT Awards

    Publication Year: 1980 , Page(s): 1410 - 1412
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    At the annual Symposium Banquet, MTT-S President Steve Adam presented the following MTT Society awards announced in October of 1979. View full abstract»

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  • Density-Independent Moisture Metering in Fibrous Materials Using a Double-Cutoff Gunn Oscillator

    Publication Year: 1980 , Page(s): 1449 - 1452
    Cited by:  Papers (4)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    A new method of density-independent moisture determination with microwaves operating at one single frequeney is developed. It is based on the two-parameter measurement of the complex dielectric constant being composed to a density-independent calibration factor A(psi) which is a function of moisture content psi. As a first application, a double-cutoff Gunn osclllator was built, stabilized by adjacent modes of a single measuring cavity containing the moist fibrous specimen. The technique removes the need for density and sample-size corrections. View full abstract»

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  • A 2450-MHz Slab-Loaded Direct Contact Applicator with Choke

    Publication Year: 1980 , Page(s): 1418 - 1422
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (888 KB)  

    A Teflon-slab-loaded direct contact microwave diathermy applicator has been developed. It produces minimal leakage radiation during effective heating of simulated planar tissue models. 'The use of TEM mode excitation results in heating patterns which are more uniform than the patterms of comparable waveguide applicators without dielectric loading. View full abstract»

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  • Dominant and Second-Order Mode Cutoff Frequencies in Fin Lines Calculated with a Two-Dimensional TLM Program

    Publication Year: 1980 , Page(s): 1443 - 1448
    Cited by:  Papers (22)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (424 KB)  

    This paper presents the dominant and second-order mode cutoff frequencies in unilateral, bilateral, and insulated fin lines as calcuIated with a two-dimensional TLM program. Through careful correction of errors associated with this method, an overall accuracy better than +-1 percent has heen achieved. This TLM program therefore provides an excellent reference for verifying other existing methods. View full abstract»

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  • Use of Microstrip Impedance- Measurement Technique in the Design of a BARITT Diplex Doppler Sensor

    Publication Year: 1980 , Page(s): 1437 - 1442
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (752 KB)  

    A computer-aided microstrip impedance-measurement technique, which yields information on microstrip-material properties, is described. The technique is used to investigate the impedence of microstrip-mounted BARITT diodes and of microstrip pad antennas. A Doppler sensor is designed, incorporating the BARITT diode into a microstrip circuit, used in diplex Doppler range-measuring radar. 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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Meet Our Editors

Editor-in-Chief
Dominique Schreurs
Dominique.Schreurs@ieee.org

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