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Antennas and Propagation, Transactions of the IRE Professional Group on

Volume 1: 1952

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Displaying Results 1 - 18 of 18
  • Impedance measurement techniques for two-mode guides

    Publication Year: 1952 , Page(s): 148 - 152
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    In this paper, work on ¿ which was partially supported by O.N.R. contract N7onr-29529, the method of impedance measurements in single-mode guide is extended to two-mode guide. Data is presented showing the impedance of a half-wave narrow slot placed parallel to the axis on the broad face of a rectangular wave-guide supporting the TE10 and TE20 nodes. View full abstract»

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  • Polarization switch and universal horn

    Publication Year: 1952 , Page(s): 135 - 147
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    The desirability of obtaining a radiating structure such that the polarization of the radiating energy could be varied in a controlled manner and yet provide a radiation pattern whose shape was invariant, led to the investigation which is the subject of this paper. View full abstract»

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  • Modified magic tee phase-shifter

    Publication Year: 1952 , Page(s): 126 - 134
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    A magic tee may be used as a microwave phase-shifter by placing adjustable short circuits in its symmetrical arms. A perfect impedance match will exist through the E- and H-plane arms if the distances from the short-circuits to the tee junction differ by (2n + 1)¿ g/4. The phase is shifted by simultaneously varying the distances from the short circuits to the tee junction. Orienting the symmetrical arms parallel to each other and replacing the E- and H-plane arms by coupling slots on opposite sides of the stucture simplifies the short-circuit driving mechanism and allows cascading of several phase-shifters. This modification is useful as a precision laboratory phase-shifter and allows the construction of a wide-angle scanning array. View full abstract»

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  • A broadband microwave quarter-wave plate

    Publication Year: 1952 , Page(s): 123 - 125
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    A differential phase shift between two orthogonal TE11 waves in circular hollow waveguide may be achieved with capacitive pins which affect one mode and not the other. Representing the two modes in the guide by two equivalent transmission lines and the pins by shunt susceptances, an analysis of an array of pins may be made to determine, as a function of pin spacing, the required values of susceptance to produce a given phase shift ¿ with no reflection. By making use of the transmission matrix giving voltage and current at one point in terms of voltage, and current at another point on the line, the following formulas for a three-element array are derived: View full abstract»

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  • An organ-pipe scanner

    Publication Year: 1952 , Page(s): 113 - 122
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    In designing many scanning antennas, it is desirable to move a feed horn for an objective, a lens, or a reflector, along a curve on the focal surface of the objective. The most direct way to solve this problem is to move a horn on the desired curve mechanically; however, there are mechanical and electrical problems inherent in this type scanner which one would like to avoid. Another approach is the use of a simple mechanical motion, such as a rotation, which could be transformed into an apparent motion along the desired curve. Organ pipes use this approach, they usually consist of a structure for propagating energy from a feed horn through a transition region of waveguide channels to a radiating aperture. By rotating some part of this structure, different portions of the aperture are used, and hence the apparent motion along the line occupied by the aperture, or scanning, is accomplished. View full abstract»

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  • Large slots in circular and rectangular waveguides

    Publication Year: 1952 , Page(s): 108 - 112
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    This report, which was supported by the Office of Naval Research under contract N7onr-29529 with the Antenna Laboratory, Institute of Engineering Research, deals with rectangular apertures in the wall of a waveguide whose dimensions are such that the length-to-width ratio is of the order of unity, the length being in the neighborhood of a half wavelength. We speak of these elements loosely as slots, though in the strict sense of the word a slot is an aperture whose width is small compared with its length. The properties of the larger aperture elements are not known as well as those of the narrow slot. The study of the properties was undertaken both for its bearing on the general theory of apertures and for the potentialities of aperture elements for antenna design work. Whereas the nature of the excitation of a narrow slot is a function of its length primarily, that of the larger aperture element is strongly dependent on its position on the waveguide wall and its orientation with respect to the dominant mode in the guide. The excitation also depends on the nature of the termination of the waveguide beyond the aperture. The greater variety of inclinations that can thus be obtained suggests possible developments in beam synthesis techniques. View full abstract»

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  • Thickness effects in slots located in various positions in rectangular waveguide

    Publication Year: 1952 , Page(s): 107
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (94 KB)  

    Theoretical expressions for the equivalent circuit parameters of slots of finite ¿ wall thickness are obtained in terms of the parameters of aero-thickness slots of identical cross-section dimensions. The thick slots are treated as composite structures consisting of appropriate junctions and lengths of connecting waveguide, and the parameters of the junctions are determined from those of corresponding zero-thickness slots. The latter parameters have been developed in previous work by our group. The thick slots considered include transverse slots coupling identical guides, transverse slots radiating from the end of the guide, slot-coupled E-plane Tees, and slots radiating from the broad face of the guide. Precision measurements have been taken at a wavelength of 3.2 cm as a function of nail thickness, and excellent agreement is obtained with the theoretical predictions. View full abstract»

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  • Factors affecting the performance of linear arrays

    Publication Year: 1952 , Page(s): 85 - 106
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    The primary problem in the design of antenna-arrays is the satisfaction of the requirements of side-lobe level and beamwidth. An additional major consideration which has only recently received an analytical treatment1 is the problem of the deterioration of the beamwidth and side-lobe level arising from the variations in the excitation of each element. These variations are due primarily to the inaccuracies inherent in the manufacturing processes used to produce the array. The first problem has been discussed in great detail by many authors,2 and it will be the purpose of this paper to analyze the second problem. The analysis is formulated in general for a symmetrically excited broadside array and then, as a specific example, is applied to a linear shunt slot array which uses a Dolph-Tchebyscheff3 distribution for the element excitations. This distribution optimizes the relationship between beam width and side-lobe level. However, the method of analysis is general and may be applied to any linear array of radiators with arbitrary excitation, if the total mutual coupling between individual radiators may be neglected and no cross correlation exists between the inaccuracies of any two sources. Consideration will be given to these fundamental assumptions to show that the general method will yield useful results for slot arrays. View full abstract»

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  • Slot radiators and arrays at X-band

    Publication Year: 1952 , Page(s): 62 - 84
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    Experimental verification of the validity of Stevenson's expression for a longitudinal shunt slot has been obtained. The theoretical expression has been found to be valid throughout X-band. Substantiating curves are shown, Resonant slot lengths as functions of slot dimensions and position on the waveguide are given. Correlation. between the phase angle of the admittance and the phase angle of the radiated field of a slot has been established. The behavior of the radiation pattern as a function of the position of the slot on the waveguide is shown. The characteristics of linear arrays of these slots are given, and some of the applications are indicated. View full abstract»

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  • Optimum patterns for arrays of non-isotropic sources

    Publication Year: 1952 , Page(s): 50 - 61
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    Methods for synthesizing the optimum patterns for arrays of isotropie sources have been given by Dolph and Riblet, using Tchebyscheff polynomials, except for arrays containing an even number of elements spaced less than a half-wavelength. The conditions which the optimum polynomial must satisfy in the latter case will be considered. For arrays of nonisotropic sources, it is possible to establish the mathematical conditions which the optimum polynomial must satisfy. Approximate methods for devising the polynomial which satisfies these conditions are discussed, and an example shown. The nature of the optimum pattern of an array of nonisotropic sources spaced more than a half wavelength is considered, and shown to be slightly different. View full abstract»

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  • A statistical approach to the problem of multiple radio interference to FM and television service

    Publication Year: 1952 , Page(s): 43 - 49
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    Since the received fields in the uhf and vhf bands vary ¿ widely in time and space, it is believed that, on many occasions, a statistical approach to communication problems may be necessary. It is the purpose of this paper to present a statistical analysis of the problem of FM and television service in the presence of multiple sources of interference. View full abstract»

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  • VHF tropospheric recording measurements of plane and circular polarized waves in the great lakes area

    Publication Year: 1952 , Page(s): 42
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    To investigate the characteristics of circularly-polarized waves as propagated through the troposphere, a field recording station has been set up at Hudson, Ohio. Continuous field intensity recordings have been made of the horizontal and vertical components as well as the circularly-polarized field over a 125-mile path from Columbus, Ohio. The results of these recordings are compared ¿ with recordings of the propagation of plane polarized waves over the same path, as wall as over the path from Detroit, Michigan, this latter path being about 50 per cent over water. A mobile recording survey has been conducted on a radial from Columbus through Hudson, and also on the circumference of a thirtymile radius around Colwdns. An analysis of this survey has been made showing the relationship betmen the horizontal and vertical components of the circularly-polarized field. lh addition, a comparison of the propagation data from Texas is made with the data obtained in this study. This cmparison sham marked daferences in the diurnal variation i n the two regions. This work has been performed under contract betmen the National Bureau of Standards and the mited Broadcasting Company. View full abstract»

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  • The zero phase-front in microwave optics

    Publication Year: 1952 , Page(s): 38 - 41
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    Many microwave optical devices have been designed and studied, at least in part, by the methods of geometrical optics. Common practice in the microwave field has been to focus attention on the family of rays rather than on the surfaces normal to them, the so-called phase-fronts. When phase-fronts are examined, they are usually obtained from the rays by passing along each ray a constant electrical distance from a reference phase-front. The clumsy analytical expression for a phase-front thus obtained renders even a routine investigation of it a burdensome exercise in mathematical manipulation. View full abstract»

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  • Strip transmission line study

    Publication Year: 1952 , Page(s): 37
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    A TEM transmission line having a circular or rectangular center conductor placed between two parallel plates or inside a rectangular tube, has been used in the construction of a number of uhf antennas and ¿ wave filters. The characteristic impedance of the class of transmission lines, of which the above-mentioned are particular examples, can be theoretically calculated by a number of methods. A review of the theoretical methods using the above transmission lines as examples will be given. Comparison between theoretical and measured results will be given to show the usefulness of the different theoretical methods. View full abstract»

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  • Quasi-static solution for diffraction of a plane electromagnetic wave by a small oblate spheroid

    Publication Year: 1952 , Page(s): 13 - 36
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    The problem of the diffraction of a plane electromagnetic wave by a small perfectly conducting oblate spheroid for the case of normal incidence has been investigated by an expansion method. By retaining three terms of the exponential function contained in the incident field, it is possible to describe both the incident field and the near-zone scattered field in terms of a finite number of discrete modes which satisfy the third order vector equation ¿ × (¿2 A) = 0, where A denotes a solenoidal vector representing either the electric field or the magnetic field. When the eccentricity of the spheroid approaches zero, the general solution reduces to the exact solution for a small sphere. When the spheroid degenerates into a disk, the expressions for the charge and the current agree with the leading terms of the corresponding expressions obtained by Meixner, Andrejewski, and Bouwkamp. View full abstract»

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  • A correlation computer and applications to radio propagation

    Publication Year: 1952 , Page(s): 4 - 12
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    Correlation functions of data, such as fading radio signals or temperature-and humidity fluctuations of the atmosphere, offer a powerful tool for analysis. By conventional methods, computation of these functions is long and tedious. Thi paper describes a computer which was constructed for this purpose. The data to be studied are transcribed onto magnetic tapes. These tapes are then run through a computer which computes the auto- or cross-correlation functions, and plots the resulting function through a recording meter. An example of the application of this computer to the study of the turbulence of the atmosphere is shown. View full abstract»

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  • Publication pians of the professional group on antennas and propagation

    Publication Year: 1952 , Page(s): 2 - 3
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    The prompt exchange of information is vital to the progress of any branch of science, and especially so in rapidly changing branches such as antennas and propagation. In order to expedite the dissemination of information in these fields, the Professional Group on Antennas and Propagation is undertaking the periodic publication of groups of articles and reports of interest to the membership. In order to accomplish the objective of promptness of publication, it is planned to keep the editorial review of papers to a minimum, thus placing the responsibility for accuracy and completeness of material entirely on the author. View full abstract»

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  • [Front matter]

    Publication Year: 1952 , Page(s): 1 - 3
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    Freely Available from IEEE

Aims & Scope

This Transactions ceased publication in 1955. The current retited publication is IEEE Transactions on Antennas and Propagation.

Full Aims & Scope