Scheduled System Maintenance:
On May 6th, system maintenance will take place from 8:00 AM - 12:00 PM ET (12:00 - 16:00 UTC). During this time, there may be intermittent impact on performance. We apologize for the inconvenience.
By Topic

Microwave Theory and Techniques, IRE Transactions on

Issue 4 • Date October 1956

Filter Results

Displaying Results 1 - 21 of 21
  • [Front cover - Oct. 1956 [T-MTT]]

    Publication Year: 1956 , Page(s): f1 - f2
    Save to Project icon | Request Permissions | PDF file iconPDF (135 KB)  
    Freely Available from IEEE
  • Table of contents (Oct. 1956 [T-MTT])

    Publication Year: 1956 , Page(s): 191
    Save to Project icon | Request Permissions | PDF file iconPDF (56 KB)  
    Freely Available from IEEE
  • Foreword (Oct. 1956 [T-MTT])

    Publication Year: 1956 , Page(s): 192
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (88 KB)  

    In the spring of 1955 the Administrative Com-mittee of PGMTT was looking for a new place to hold the yearly technical meeting of the group. The writer was present at the meeting where possible places were discussed, and he was aslied whether he thought a meeting in Philadelphia could be arranged. The idea of holding a local meeting devoted to microwave relays had already been discussed by him with others of the Philadelphia area, and accordingly it seemed as though the situation demanded that the national and local meetings be combined. Presentation of the idea to the Executive Committee of the Philadelphia Section resulted in their approval and agreement to participate as a co-sponsor. Later, the PGAP also agreed to co-sponsor the meeting. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Nonuniform, Inhomogeneous, and Anisotropic Waveguides

    Publication Year: 1956 , Page(s): 193 - 196
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB)  

    This paper discusses in a general way some of the properties of nonuniform, inhomogeneous, and anisotropic waveguides and transmission lines. No attempt is made to discuss in detail the behavior of any particular type of waveguide except for the purposes of example. Most of the points discussed are well known separately, but an attempt has been made to bring some of general properties of special types of waveguide together in order to unify them, and, thus, it is hoped, to contribute to the over-all understanding of guided wave phenomena. View full abstract»

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

    Publication Year: 1956 , Page(s): 197 - 200
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (471 KB)  

    The properties of two-wire lines and single wire lines (surface wave transmission lines) are discussed on a comparative basis. The two-wire line is actually a system of two coupled single wire lines and thus requires a high degree of symmetry to maintain the desired wave mode. While the single wire line is more affected by bends it has the advantages that it is simpler in construction and is less susceptible to weather conditions. The main domain of the two-wire lines lies in the frequency range below 100 mc and that of the single wire line in the range above 100 mc. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Rectangular and Ridge Waveguide

    Publication Year: 1956 , Page(s): 201 - 209
    Cited by:  Papers (6)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1293 KB)  

    This paper describes the present state of the art with respect to rectangular ridge waveguide giving tables and data from standard waveguide sizes and constructional techniques for both rigid and flexible waveguide. The problems inherent in waveguide connectors are discussed along with the various methods for producing waveguide assemblies. The problems inherent with present-day waveguide standardization are also discussed. It is essential that a series of standard waveguide for high pressure operation and for extremely broadband operation (ridgeguide) be standardized. The latest RETMA miniature standard flanges are shown along with present-day thinking on a series of pressurized contact flanges. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Broad-Band Microwave Circulator

    Publication Year: 1956 , Page(s): 210 - 217
    Cited by:  Papers (19)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (685 KB)  

    The discovery of a simple, low loss way to hold Faraday rotation constant over a broad-band (coupled with the development of wide-band, high return loss, circular-to-rectangular waveguide transformers, and polarization couplers) has made it possible to design and build a high quality circulator for use in the 10.7 kmc to 11.7 kmc band. The essential characteristics of the described unit include a more than 30-db return loss at each terminal, an isolation of 30 db or greater between "isolated" terminals, and a 0.35-db insertion loss between transmission terminals. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The Excitation of Surface Waveguides and Radiating Slots by Strip-Circuit Transmission Lines

    Publication Year: 1956 , Page(s): 218 - 222
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1056 KB)  

    A variety of methods for coupling between a shielded strip-circuit transmission line, operating in the TEM coaxial mode, and a surface waveguide have been investigated. The arrangements include phased dipole arrays, series ground-plane slots and Iongitudinal slot excited probes. Impedance and matching conditions for each are discussed together with their relative efficiency and bandwidth. In the case of a single radiating slot, measurements on the effective equivalent circuit have been made as a function of the orientation angle of the slot with respect to the axis of the strip-line guide. Slots used ranged in length from 0.3 to 0.6 lambdag, having length/width ratios from 5 to 16. View full abstract»

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

    Publication Year: 1956 , Page(s): 223 - 227
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (528 KB)  

    Theory and performance of a narrow band circulator employing but a single junction and a 45-degree Faraday rotator are discussed. Factors affecting bandwidth are considered and pertinent curves are plotted. Isolation bandwidth curves permit prediction of performance. This compact circulator, although frequency sensitive, is tunable and provides high reverse and cross isolations making it especially suited to duplexing, isolating and switching applications. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Nonreciprocal Two-Ports Represented by Modified Wheeler Networks

    Publication Year: 1956 , Page(s): 228 - 233
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (571 KB)  

    The extension of the (reciprocal) modified Wheeler network to include the more general nonreciprocal two-port is given. This representation is derived via a known decomposition of the general nonreciprocal network into two portions, one reciprocal, the other nonreciprocal. The reciprocal portion is then taken as the modified Wheeler network. Recombination of the elements results in the desired representation which is constituted of a minimum number, i.e., of eight, passive elements. Each of these is a natural idealization of a physical microwave component. Since six of the elements belong to the class of "bilaterally matched" networks, some of the properties of this class are discussed. Two of the bilaterally matched elements embody the nonreciprocal properties of the network: a one-way attenuator and a one-way phase-shifter. Many of the characteristics of the (reciprocal) modified Wheeler network carry over directly to this nonreciprocal representation. The microwave measurement of the network parameters is also indicated. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Criteria for the Design of Loop-Type Directional Couplers for the L Band

    Publication Year: 1956 , Page(s): 234 - 239
    Cited by:  Papers (10)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (835 KB)  

    For many years the design of loop type directional couplers has relied heavily on experiment. One of the most common varieties has been the loop coupler much shorter than a wavelength and having a built-in termination (vestigial arm). In this paper the criteria for the design of loop couplers of any length are considered, and their application to either coaxial line or waveguide are discussed. The theoretical basis for design is established by first considering the theory of coupled transmission lines. Several designs which utilize a quarter-wavelength or shorter loops and which have very desirable features with regard to coupling, directivity, and band-width are illustrated. Typical performance of couplers having couplings of 20-40 db and directivities of over 30 db are presented. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Improved Rectangular Waveguide Resonance Isolators

    Publication Year: 1956 , Page(s): 240 - 243
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (373 KB)  

    The early resonance isolators, using nearly full waveguide height ferrite slabs, gave a high reverse loss per unit length but a disappointingly low reverse-to-forward loss ratio. By substantially reducing the height of the ferrite slabs, the reverse-to-forward loss ratio can be increased at the expense of reverse loss per unit length. More recently, it has been found that the addition of certain dielectric loading in rectangular waveguide resonance isolators results in generally improved performance. Thus, the reverse-to-forward loss ratio of these isolators is high (150 to 1 at X band) and the reverse loss per unit length is also high (20 db/inch at X band). The broad-banding problem will also be briefly discussed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An Automatic Gain Control System for Microwaves

    Publication Year: 1956 , Page(s): 244 - 245
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (189 KB)  

    This paper describes a system which can keep the power level in a microwave set-up constant with good accuracy in spite of variations of the input power level. The system uses a variable attenuator based on the Faraday rotation in magnetized ferrite and thereby achieves a frequency response up to about 500 cps with the present equipment and much better potential response. Variations in input power are reduced by a factor varying from 10 to 400 depending on available power and on the detector used to detect the output power. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Method of Analysis of Symmetrical Four-Port Networks

    Publication Year: 1956 , Page(s): 246 - 252
    Cited by:  Papers (198)  |  Patents (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (538 KB)  

    An analysis of four-arm symmetrical networks such as a branched directional double stub coupler or the hybrid ring (rat race) is presented. The input wave is broken into an even and an odd mode and the vector amplitude out the various arms is computed from the sums or differences of the reflection or transmission coefficients for the two modes. A zero decibel directional coupler is described and its possible use as a duplexer is proposed. The design of multiple stub directional couplers for any degree of coupling is discussed. A method of computing the bandwidth of all these couplers is outlined, and the bandwidth curves, the power out the various arms with respect to frequency of the zero decibel coupler, are computed. A tabulation is made for six different 3 db couplers (even-power split) and their standing wave ratio, evenness of power split and isolation of the fourth arm as a function of frequency assuming perfect performance at the band center. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Broad-Band Waveguide Series T for Switching

    Publication Year: 1956 , Page(s): 252 - 255
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (376 KB)  

    By use of properly proportioned half-wavelength transformer-sections in the arms of a waveguide series T broad-band performance can be obtained for switching applications. Over the frequency band 8200 to 9765 megacycles per second, corresponding to a bandwidth of 17.4 per cent, an experimental model showed an insertion vswr of less than 1.15 for transmission through the aligned arms and 1.30 for transmission around the bend. Further bandwidth improvement is possible with the use of a special arrangement of quarter-wave transformer sections but at the expense of further impairment of power-carrying capacity. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A Traveling-Wave Directional Filter

    Publication Year: 1956 , Page(s): 256 - 260
    Cited by:  Papers (28)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (450 KB)  

    A new type of microwave filter is presented in which resonance occurs in the form of a traveling wave rather than in the conventional form of a standing wave. This device is a constant-resistance circuit, and therefore presents a very low input vswr. Formulas for loaded Q and insertion loss are given. Experimental results verify the theoretical approach. This filter, which is constructed of a transmission-line loop and two directional couplers, finds application in multiplexing filters as well as in matched band-pass and band-rejection filters. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Miniaturization of Microwave Assemblies

    Publication Year: 1956 , Page(s): 261 - 262
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (459 KB)  

    A method of construction is described in which waveguides are arranged in a single plane with adjacent walls common. An assembly is made from a top and bottom plate between which partition walls are arranged to constitute the transmission region. A hybrid-T is made from a 3 db coupler, and a microwave repeater is described consisting of five band-pass filters, two hybrid-T's, an isolator, and several other component aspects. Setting up in situ is achieved by the use of a Bethe hole coupler to monitor the reflection or transmission at a number of specially located check ports. No electric coupling can be measured across a soldered fabricated waveguide wall. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Recent Advances in Finline Circuits

    Publication Year: 1956 , Page(s): 263 - 267
    Cited by:  Papers (10)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (685 KB)  

    Detailed studies of transmission properties of the finline coupler have revealed existence of certain phenomena which adversely affect the transmission characteristics. A discussion of the origin and successful elimination of such effects is described. New applications for the finline coupler have been found in the design of hybrid junctions, twists and bends in multimode waveguide, and other polarization selective devices. The paper concludes with a presentation of theoretical and experimental results in the application of finline techniques to low-pass microwave filters. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Recent Advances in Waveguide Hybrid Junctions

    Publication Year: 1956 , Page(s): 268 - 271
    Cited by:  Papers (9)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (369 KB)  

    Design techniques for waveguide hybrid tee junctions, resulting in convenient structures and simple internal matching elements for increased bandwidth and power-handling capacity are described, and experimental data are given. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Contributors (Oct. 1956 [T-MTT])

    Publication Year: 1956 , Page(s): 271 - 274
    Save to Project icon | Request Permissions | PDF file iconPDF (922 KB)  
    Freely Available from IEEE
  • [Back cover - Oct. 1956 (T-MTT)]

    Publication Year: 1956 , Page(s): b1 - b2
    Save to Project icon | Request Permissions | PDF file iconPDF (56 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