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Microwaves, Antennas and Propagation, IEE Proceedings H

Issue 3 • Date June 1986

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Displaying Results 1 - 18 of 18
  • Accurate analysis of latching phase s.hifters

    Publication Year: 1986 , Page(s): 165 - 168
    Cited by:  Papers (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (475 KB)  

    Ferrite-latching phase shifters in a generalised waveguide geometry (grooved rectangular guide with lateral ridges) are analysed using a combination of mode-matching and perturbation techniques. By this method, the double transverse inhomogeneities of the waveguide configuration and of the toroid corner magnetisation are both considered exactly, leading to accurate predictions of differential phas... View full abstract»

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  • Stopband optimised E-plane filters with multiple metal inserts of variable number per coupling element

    Publication Year: 1986 , Page(s): 169 - 174
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (487 KB)  

    Improved stopband attenuation of E-plane filters is achieved by replacing merely a few of the conventional single insert coupling elements by triplets or quintuplets of metal inserts. The method of field expansion into suitable eigenmodes used considers the effects of finite insert thickness and the mutual higher order mode interaction of all inserts. Calculated stopband attenuations of more than ... View full abstract»

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  • Erratum: A new technique for absolute temperature compensation of tunable resonant cavities

    Publication Year: 1986
    Save to Project icon | PDF file iconPDF (25 KB)  
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  • Erratum: A new technique for absolute temperature compensation of tunable resonant cavities

    Publication Year: 1986
    Save to Project icon | PDF file iconPDF (25 KB)  
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  • Dynamic transfer properties of frequency multipliers

    Publication Year: 1986 , Page(s): 175 - 182
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (893 KB)  

    Noise and transfer properties of frequency multipliers with step-recovery diodes and depletion-layer varactors are investigated both theoretically and experimentally. Parameters are the multiplication factor the number of diodes drive level and detuning of the input frequency, the bias conditions and the terminations at the harmonics. Distortions of angle-modulated signals mainly originate in AM-P... View full abstract»

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  • Phase comparator at 2.5 GHz

    Publication Year: 1986 , Page(s): 183 - 186
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (352 KB)  

    Images of biological objects can be obtained by exploration with microwaves. Reconstitution of the image takes place by distribution in phase and in amplitude of the diffracted field on a portion of a spherical surface. Obtaining these parameters requires a precision phase comparator at a working frequency of 2.5 GHz. The comparator consists of an arrangement of four couplers of 3 dB, one phase sh... View full abstract»

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  • Analysis of microstrip-slotline ring 3 dB directional couplers

    Publication Year: 1986 , Page(s): 187 - 190
    Cited by:  Papers (3)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (437 KB)  

    The paper deals with the analysis of a new class of microstrip slotline ring 3 dB directional couplers which possess topological symmetry with respect to two of the input ports. Slotline or slotline microstrip T-junctions are used to obtain the frequency independent 180¿¿ phase shift. This provides for a high frequency independent isolation between the input ports. In the analysis effects of micro... View full abstract»

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  • Interdigital microstrip capacitor as a four-port network

    Publication Year: 1986 , Page(s): 191 - 197
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (699 KB)  

    For versatile connections in an MIC circuit, an interdigital microstrip capacitor may be considered as a four-port network with some open ports instead of a straight two-port one. The impedance of the four-port network can be simple, up to its resonant frequency, based on some simple expressions for the even- and odd-mode capacitances for microstrip fingers. View full abstract»

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  • Simple analysis and design of annular ring microstrip antennas

    Publication Year: 1986 , Page(s): 198 - 202
    Cited by:  Papers (6)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (539 KB)  

    A simple analysis of thin annular-ring microstrip antennas (AR-MSA), along with a design technique that yields the optimum ring dimensions which maximises the radiation efficiency and the bandwidth, is presented in this paper. Using the cavity model, exact closed form solutions for the radiation fields are derived. The antenna fields distribution, resonance dimensions, radiation patterns, directiv... View full abstract»

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  • Scattering of an arbitrary wave by a thin strip grating reflector

    Publication Year: 1986 , Page(s): 203 - 208
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (632 KB)  

    A simple approximation method to calculate scattering from a thin strip grating of a finite size is proposed for arbitrarily polarised incidence with an arbitrary plane of incidence. First, the grating is projected on the plane normal to the direction of incidence. The grating parameters are transformed at the same time according to a simple rule. Then, reflection and transmission coefficients for... View full abstract»

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  • Transformation of linearly constrained broadband processors to unconstrained partitioned form

    Publication Year: 1986 , Page(s): 209 - 212
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (415 KB)  

    The paper presents a technique for transforming linearly constrained broadband time-domain processors to an unconstrained partitioned form via an orthogonal decomposition of the constraint matrix. It is shown that the partitioned structure drops out naturally from solving the mathematics of the transformed unconstrained, optimisation problem. This approach enables the relationship between the Fros... View full abstract»

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  • Direct far-field GO synthesis of shaped beam reflector antennas

    Publication Year: 1986 , Page(s): 213 - 220
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (871 KB)  

    The problem of synthesising a reflector surface to produce a prescribed far-field radiation pattern when illuminated by a point source feed is treated using the complex co-ordinate method of Westcott. The far-field boundary value problem is formulated on a Cartesian grid and the solution technique demonstrated for two example specifications typical of satellite communication systems. The potential... View full abstract»

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  • Dual reflector antennas with amplitude phase or Abb¿¿ conditions

    Publication Year: 1986 , Page(s): 221 - 226
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (611 KB)  

    The design of dual reflector antennas has been simplified by a method of deriving the secondary reflector from any prescribed main reflector for quite general focusing conditions. Consequently, main reflectors which are constructed from a series of generic curves can be considered, and they and their associated subreflectors optimised to satisfy a given second condition by numerical methods. This ... View full abstract»

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  • Numerical solution of scattering from coated bodies of revolution using different integral equation formulations

    Publication Year: 1986 , Page(s): 227 - 232
    Cited by:  Papers (2)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (661 KB)  

    The electromagnetic scattering from coated conducting bodies of revolution is computed using the moment method. The equivalent principle is used to generate different formulations for the problem. These formulations are then used to compare the numerically determined solutions with the analytic ones, for coated spheres using the Mie series solution. It is shown that the solution accuracy generally... View full abstract»

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  • Radiometric sky temperature measurements at 35 and 89 Ghz

    Publication Year: 1986 , Page(s): 233 - 237
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (521 KB)  

    A set of radiometric sky temperature measurements at 35 and 89 GHz is presented in the paper. The system used to make the measurements is described as well as the method used for calibration. The temperatures were measured as a function of elevation twice a day over a period of about six months. Examples of the results obtained are presented together with a cumulative frequency graph of zenith tem... View full abstract»

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  • Mutual admittance between slots on a cylinder using the extended Poynting vector method

    Publication Year: 1986 , Page(s): 238 - 240
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (330 KB)  

    The extended Poynting vector method is used to derive formulas for the mutual admittance between two identical slots on a perfectly conducting circular cylinder. Formulas for this geometry have earlier been derived via the reaction theorem. A disadvantage with those expressions is the poor convergence of the integral for large axial slot separations. Through extensive manipulations one formula can... View full abstract»

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  • Microwave propagation in dust storms: a review

    Publication Year: 1986 , Page(s): 241 - 247
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1035 KB)  

    A review is given of the literature covering the effects of dust storms on microwave links. Most authors have calculated the effects of absorption of energy, revealing that it is not very significant unless very high suspended dust densities are assumed. A few papers indicate the possibility of more significant cross polarisation. Air refractive effects associated with dust storms have been relati... View full abstract»

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  • Technical memorandum: Analysis of electromagnetic systems by means of fourier transform techniques

    Publication Year: 1986 , Page(s): 248 - 250
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (411 KB)  

    We have developed a method for calculating eigenfrequencies and field distributions for the modes of waveguides and resonant cavities The core of the method is the application of Fourier transforms to a time-domain solution of Maxwell's equations. For quasi-one-dimensional systems we find a convergence criterion relating the spatial and time mesh widths which makes it extremely convenient. Finally... View full abstract»

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