By Topic

Antennas and Propagation, IEEE Transactions on

Issue 9 • Date September 1986

Filter Results

Displaying Results 1 - 14 of 14
  • [Front cover and table of contents]

    Publication Year: 1986 , Page(s): 0
    Save to Project icon | Request Permissions | PDF file iconPDF (172 KB)  
    Freely Available from IEEE
  • Optimum optical limited scan antenna

    Publication Year: 1986 , Page(s): 1133 - 1142
    Cited by:  Papers (1)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (840 KB)  

    An optical limited scan antenna system is considered for applications such as spot coverage of a small portion of the earth from a satellite. The optimum criterion relating aperture efficiency, number of control elements, and angular coverage is revisited briefly. The optical scheme advocated utilizes a bootlace aperture lens, a generalized Luneberg lens focused to the near field, and a small arra... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • High-frequency multiple diffraction by a flat strip: Higher order asymptotics

    Publication Year: 1986 , Page(s): 1106 - 1112
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (664 KB)  

    By including correction terms in inverse powers of the wavenumber k , one may hope to extend the range of applicability of multiple edge diffracted geometrical theory of diffraction (GTD) to lower frequencies, and also to extend thereby the range of validity of the corresponding time domain solutions. The correction can be applied to each of the surface rays i... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The electromagnetic edge wave due to a point source of current radiating in the presence of a conducting wedge

    Publication Year: 1986 , Page(s): 1125 - 1132
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (656 KB)  

    Cylindrical wave expansions for the dyadic Green's functions for electric and magnetic fields of a point source of electric current radiating in the presence of a perfectly conducting wedge are derived using a scalarization procedure developed by Levine and Schwinger. The forms derived from this procedure involve a sum over angular wavenumbers and a continuous spectral integral which may be expres... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A vector space approach to direction finding in a coherent multipath environment

    Publication Year: 1986 , Page(s): 1069 - 1079
    Cited by:  Papers (27)  |  Patents (19)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1064 KB)  

    The superresolution methods of spatial spectrum estimation heretofore reported are known to break down when arriving signals from different directions are coherent. It is shown here that this deficiency can be overcome by replacing the direction-of-arrival (DOA) search vector ordinarily used with a linear combination of such vectors. Particular attention is here given to extending the multiple sig... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Effective earth radius for refraction of radio waves at altitudes above 1 km

    Publication Year: 1986 , Page(s): 1099 - 1105
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (544 KB)  

    Atmospheric refractivity gradients are responsible for the bending of radio and microwave propagation paths such that the electromagnetic line-of-sight deviates from the geometrical line-of-sight. Such refraction effects must be accounted for when the performance of airborne surveillance radar systems is modeled. For propagation paths within 1 km of the earth's surface, the effective earth radius ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The physical optics fields of an aperture on a perfectly conducting screen in terms of line integrals

    Publication Year: 1986 , Page(s): 1155 - 1159
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (392 KB)  

    The physical optics fields due to an aperture on a perfectly conducting screen are expressed in terms of line integrals over the boundary of the aperture. These line-integral representations have the same properties as the ones in terms of surface integrals over the aperture; in particular, they admit arbitrary, source distributions, and are continuous everywhere in the source-free half-space, inc... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The design of slot arrays including internal mutual coupling

    Publication Year: 1986 , Page(s): 1149 - 1154
    Cited by:  Papers (59)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (408 KB)  

    Improved array performance (lower sidelobe levels, a better input match) requires elimination of approximations in earlier design procedures. One important change is to include internal higher order mode coupling. That is done here and is found to cause a simple but significant change in existing design formulas. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the fields in a conical horn having an arbitrary wall impedance

    Publication Year: 1986 , Page(s): 1092 - 1098
    Cited by:  Papers (11)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (856 KB)  

    The electromagnetic fields propagating up a cone having an arbitrary wall impedance are found using an asymptotic solution. Three special cases are then considered: the smooth-metal wall, the corrugated wall, and the metal wall with a lossy-dielectric lining. The last case, in the form of an absorber-lining is then shown to behave like a corrugated horn since it too provides a highly tapered View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Reflection and transmission characteristics of a slab with periodically varying surfaces

    Publication Year: 1986 , Page(s): 1159 - 1163
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (456 KB)  

    Using a plane wave spectral decomposition of the relevant electromagnetic (EM) fields and the T-matrix solution philosophy, a T-matrix is formulated which completely characterizes the EM response of an infinite material plate bounded by two homogeneous half-spaces, the two interfaces being periodically rough. Individual T-matrices for either of the two periodic bimaterial interfaces are used in th... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Ionospheric radio propagation models and predictions--A mini-review

    Publication Year: 1986 , Page(s): 1163 - 1170
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (968 KB)  

    The ionosphere affects radio waves that are propagated within and through it. The magnitude of the effects depends upon the structure of the ionosphere and the frequency of the radio wave. Ionospheric models have been developed over the years to aid in predicting the impact of the ionosphere on ionospheric-dependent telecommunication systems. The status of ionospheric modeling and prediction effor... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A technique for an array to generate circular polarization with linearly polarized elements

    Publication Year: 1986 , Page(s): 1113 - 1124
    Cited by:  Papers (139)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1128 KB)  

    A method is presented for generating circularly polarized radiation from an array composed of linearly polarized elements having unique angular and phase arrangements. With this technique the complexity, weight, and RF loss of the array feed can be significantly reduced, especially in a large array. This uniquely formed array has the capability of generating excellent circular polarization (CP) ov... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Radiation by a probe through a substrate

    Publication Year: 1986 , Page(s): 1080 - 1091
    Cited by:  Papers (18)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (672 KB)  

    Radiation by a probe through a grounded substrate layer is considered. The reaction concept is adopted and the coaxial line aperture effects are taken into account. Image theory is invoked to simplify the evaluation of the involved Sommerfeld type integrals. These integrals are computed through a real axis integration which combines numerical and analytical techniques. An interpolation method is i... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Axial mode helical antennas

    Publication Year: 1986 , Page(s): 1143 - 1148
    Cited by:  Papers (20)  |  Patents (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (560 KB)  

    The radiation characteristics of helical antennas operating in the axial mode are evaluated on the basis of the theoretical current distributions and are verified by experimental work. A comparison between monofilar helix and bifilar helix antennas is made, and a helical antenna with a parasitic helix (HAP) is proposed in order to enhance the power gain. It is found that the gain of the HAP in whi... View full abstract»

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

Aims & Scope

IEEE Transactions on Antennas and Propagation includes theoretical and experimental advances in antennas.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief                                                 Kwok W. Leung