By Topic

Microwave Theory and Techniques, IRE Transactions on

Issue 4 • Date October 1957

Filter Results

Displaying Results 1 - 24 of 24
  • [Front cover - Oct. 1957 [T-MTT]]

    Page(s): f1 - f2
    Save to Project icon | Request Permissions | PDF file iconPDF (115 KB)  
    Freely Available from IEEE
  • Index, IRE Transactions on Microwave Theory and Techniques, Volume MTT-5, 1957

    Page(s): i - iii
    Save to Project icon | Request Permissions | PDF file iconPDF (373 KB)  
    Freely Available from IEEE
  • Table of contents (Oct. 1957 [T-MTT])

    Page(s): 221
    Save to Project icon | Request Permissions | PDF file iconPDF (56 KB)  
    Freely Available from IEEE
  • Message from the Editor (Oct. 1957 [T-MTT])

    Page(s): 222
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (55 KB)  

    In the preceding issue Herbert F. Engelrnann, past Chairman of the PGMTT, expressed indebtedness to and congratulated Theodore S. Saad who for three years as editor devoted tireless efforts in building up the IRE Transactions on Microwave Theory and Techniques to a highly-technical and valuable publication. I wish to take this opportunity to endorse heartily this congratulation and to express hope that the high publication standard can be maintained. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Biography - Wilmer L. Barrow

    Page(s): 223
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (211 KB)  

    Wilmer L. Barrow is Vice-President for Research and Development of the Sperry Gyroscope Company, following previous appointments as Sperry's Chief Engineer in 1947 and as Vice-President in 1952. Formerly, he was on the faculty of Massachusetts Institute of Technology under wartime emergency as Director of Fire Control in 1943, and Director of Armament Engineering in 1945. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Yesteryear--Tomorrow

    Page(s): 224 - 225
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (229 KB)  

    It is an exciting experience for an individual to participate in the birth of a new technological discovery and then to live to see it develop from infancy into a mature and important factor in the world. Such an experience comes unexpectedly to only a few lucky individuals and then usually once in a lifetime. I have always considered myself fortunate to have shared this kind of experience with a few other fortunate persons in the opening up and growth of the modern microwave industry. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Microwave Prize (Oct. 1957 [T-MTT])

    Page(s): 226
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (137 KB)  

    The Professional Group on Microwave Theory and Techniques has established the Microwave Prize to recognize annually a significant paper which appeared in the IRE Transactions on Microwave Theory and Techniques. In selecting the paper, consideration is given primarily to the subject of the contribution and secondarily to its presentation. The award consists of a certificate, a monetary sum of $100, and a feature publication in these Transactions. If the paper has more than one author, the monetary sum is to be divided equally among the authors. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Variable-Ratio Microwave Power Divider and Multiplexer

    Page(s): 227 - 229
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (497 KB)  

    A microwave circuit is presented which provides continuous variation of microwave power between two outputs in any desired ratio. A typical device utilizing the circuit is described, and other uses of the circuit are discussed. An X-band power divider was constructed which had a vswr of less than 1.2 at all times over the frequency range of 8.6 to 9.6 kmc, divided the total input energy between the outputs in any ratio from 1/10,000 to 1, and had less than 0.4-db total insertion loss. No other losses were present. Adjustment could be made under maximum power levels of the waveguide. Another use of the circuit is to couple two high-power transmitters into one output, thus providing a dual frequency antenna coupler or diplexer. By cascading diplexers, multiplexing can be accomplished. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • High-Power Ferrite Circulators

    Page(s): 230 - 237
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (748 KB)  

    The Faraday rotation and insertion loss of various ferrite-loaded waveguide structures have been studied in order to determine their power-handling capacities. A method of measuring insertion loss to within +-0.05 db is described. Two figures of merit containing this information are defied for the various configurations. The first, defined as the rotation per attenuation, indicates for a given value of rotation the efficiency of power transmission through the device, while the second, defined as the dissipative area per power loss, indicates the power handling capacity of the structure. By utilizing this information, the author has described an X-band ferrite circulator which is capable of handling an average power of 1000 watts. In addition, the design of a 2000-watt gyrator type circulator is indicated. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Spectral Distribution of Thermal Noise in a Gas Discharge

    Page(s): 237 - 238
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (211 KB)  

    By means of thermodynamic considerations it is shown under which conditions microwave noise power generated by a gas discharge can be considered thermal. A critical analysis of Mumford's hypothesis is made. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Design of Aperture-Coupled Filters

    Page(s): 238 - 243
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (606 KB)  

    A procedure for the design of aperture-coupled Filters is presented, based on the theory of conventional coupled circuits. This design procedure accounts for the relatively low insertion loss of aperture-coupled filters as compared with other known designs of microwave filters. The factors which contribute to this low value of insertion loss are the following: 1) Use of a high Q-mode configuration such as a cylindrical cavity in the TE011 mode. 2) Aperture coupling of elements eliminating the losses of impedance transforming sections of transmission line. 3) A mechanical design which eliminates joints at critical points and also provides control over interior surface finishes. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Optimum Impedance and Dimensions for Strip Transmission Line

    Page(s): 244 - 247
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (446 KB)  

    This paper makes use of the higher mode limitations on the dimensions of symmetrical strip transmission line to derive the permissible dimensions at any given frequency and characteristic impedance. In conjunction with Cohn's results for the attenuation in strip transmission line these are used to obtain the maximum achiew able Q at any frequency and the optimum characteristic impedance; that is, the impedance providing the lowest attenuation. This provides the basis for selecting the characteristic impedance for resonant elements in strip line filters and other applications wherein the lowest possible attenuation is desired. Conclusions are also reached regarding the best form factor (ratio of strip thickness to ground-plane spacing) for a given characteristic impedance. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Deflection of Waveguide Subjected to Internal Pressure

    Page(s): 247 - 250
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (393 KB)  

    The pressure carrying capacity of a large range of standard waveguide sizes can be readily determined by the use of formulas presented in this paper. The derivation of these formulas is obtained by a contiguous beam analogy and comparable test results are shown which substantiate the validity of the theoretical analysis. Where high pressure conditions prevent the use of standard waveguide, these same formulas are utilized in the development of special high-strength lightweight guide. Techniques for designing such waveguide, including the use of a honeycomb sandwich construction, are discussed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Calibration of Microwave Attenuators by an Absolute Method

    Page(s): 250 - 254
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (504 KB)  

    A bridge method by means of which microwave attenuators can be calibrated absolutely is described, with a consideration of the main possible sources of error. A bridge was set up at lambda0 = 3.2 cm to test the principle of the method. It was shown that, using nonspecialized equipment, a high degree of accuracy was obtainable. An attenuator was calibrated over a range of 20 db, with an accuracy of the order of +-0.02 db. This accuracy is within the accuracy of other methods of calibration in current use, and there seems no reason why, with suitable precautions, the order of accuracy should not be improved still further, if required. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Pulse Waveform Degradation Due to Dispersion in Waveguide

    Page(s): 254 - 257
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (314 KB)  

    Phase velocity in a waveguide is a nonlinear function of frequency and thus causes dispersion of the spectral components in a pulse waveform. For most practical cases, it is a good assumption to consider the phase constant to be a quadratic function of frequency. An expression can then be derived for the exit waveform shape as a function of guide length, dispersion, and width of the input rectangular pulse. The derived expression is given in terms of tabulated error functions and Fresnel integrals. It is universal in form and applicable to a wide range of practical problems, A family of degraded shapes has been computed from this expression and is presented graphically. The results apply for any mode in a straight waveguide of arbitrary but constant cross section. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Broad-Band Quarter-Wave Plates

    Page(s): 258 - 261
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (443 KB)  

    Analytical expressions are given for the propagation constant for the two orthogonal dominant modes in a square waveguide loaded with a centered slab of dielectric. These are combined to find the differential phase shift in a loaded section. Solutions of these equations are given for polystyrene which enables one to design broad-band quarter wave plates. The problem of transforming from unloaded to loaded guide is discussed and two solutions are given and another suggested. Experimental results are given and it is found that the work in square guide carries over to circular guide almost intact. It is shown that quarter-wave plates may easily be designed to cover a normal waveguide bandwidth. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Coherent Spontaneous Microwave Emission by Pulsed Resonance Excitation

    Page(s): 262 - 265
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (565 KB)  

    This paper describes an investigation of the coherent microwave emission from pulse-excited ammonia molecules. Coherent and periodic pulses of near resonance frequency and 1-µsec duration excited the gas from its initial thermal equilibrium condition. Self-induced coherent emission (molecular ringing) continued after the excitation field was removed. This radiation was observed during a period of 10 µsec. In an actual experiment performed, a new Doppler bandwidth reduction method was used in the gas cell. The observed spectral width of the ammonia 7,7 line was about 5 kc. The emission was used to stabilize the excitation signal source to a short-term frequency stability of 2 X 10-10. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Available Power of a Matched Generator from the Measured Load Power in the Presence of Small Dissipation and Mismatch of the Connecting Network (Correction)

    Page(s): 265
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (120 KB)  

    Leonard Sweet, co-author with M. Sucher of the correspondence, "The Available Power of a Matched Generator from the Measured Load Power in the Presence of Small Dissipation and Mismatch of the Connecting Network," which appeared on pages 167-168 of the April, 1957 issue of these Transactions, has brought the following correction to the attention of the editors. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Planar Transmission Lines--Part III (Correction)

    Page(s): 265
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (120 KB)  

    Karle S. Packard, author of "Planar Transmission Lines-Part III," a correspondence which appeared on page 163 of the April, 1957 issue of these Transactions, wishes to make the following correction to his paper. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Determination of Equivalent Circuit Parameters (Correspondence)

    Page(s): 266 - 267
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (198 KB)  

    At a given frequency, a lossless discontinuity on a transmission line may be represented by an equivalent circuit consisting of an ideal transformer and two lengths of transmission line. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Effect of a Mismatched Ring in a Traveling-Wave Resonant Circuit (Correspondence)

    Page(s): 267 - 268
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (108 KB)  

    In traveling-wave resonant ring circuits wave amplitude "amplification" has been predicted and shown experimentally. In the present note, the input reflection coefficient (input vswr) and wave amplification are considered when the resonant ring circuit contains a mismatch. Qualitatively a small mismatch (low vswr) can produce under resonant conditions a greatly "magnified" input vswr and reduces the maximum attainable amplification in the ring. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Contributors

    Page(s): 268
    Save to Project icon | Request Permissions | PDF file iconPDF (454 KB)  
    Freely Available from IEEE
  • Freely Available from IEEE
  • [Back cover]

    Page(s): b1 - b2
    Save to Project icon | Request Permissions | PDF file iconPDF (308 KB)  
    Freely Available from IEEE

Aims & Scope

This Transactions ceased publication in 1962. The current retitled publication is IEEE Transactions on Microwave Theory and Techniques.

Full Aims & Scope