Showing papers on "Conformal antenna published in 1979"
01 Jun 1979
TL;DR: The reviewer should also make notes on the manuscript wherever English usage and/or grammar are poor as mentioned in this paper ; however, it is seldom that a reviewer takes the time to take the time t o w r i t o a t e a t l e a s t one sentence on a l l o f t he above items.
Abstract: The reviewer should also make notes on the manuscript wherever English usage and/or grammar are incor rec t o r poor. Remember the IEEE E d i t o r i a l Department usual ly does an excellent job correcting author manuscripts; so the reviewer should not feel obl iged to cor rec t every detai l of Engl ish, e tc . This is a lso t rue wi th regard t o format and standardization of mathematical expressions. The reviewer must make eve ry e f fo r t t o complete the review within the al located four-week per iod; in fac t , i f the rev iewer cannot meet t h i s commitment, he should inform the Editor or Associate Edi tor , who s e n t him the manuscript , when he receives it. Al of these points are indicated or implied by the current review forms; however, it is seldom t h a t a reviewer takes the time t o w r i t e a t l e a s t one sentence on a l l o f t he above items.
38 citations
TL;DR: An antenna pattern design technique which results in a generalized Taylor pattern, except in a narrow region where a deep null is formed, centered at a preassigned position is presented in this paper.
Abstract: An antenna pattern design technique which results in a generalized Taylor pattern, except in a narrow region where a deep null is formed, centered at a preassigned position is presented. It is shown how this technique can be applied effectively to both linear arrays and line sources. The approach is direct so that the technique does not use either iterative sampling or a perturbation procedure. It is particularly useful in the design of a large array with a prescribed deep null. Numerical results indicate that to steer such a null, adjustment of the excitation is necessary near the edges only.
18 citations
TL;DR: In this article, a study of the radiation characteristics of dielectric tube antennas is made with a possibility of its application in communications satellites, and it has been shown through a systematic analysis that a multimoded dielectrous tube shows a dip in the boresight region which is suitable for satellite antennas.
Abstract: A study of the radiation characteristics of dielectric tube antennas is made with a possibility of its application in communications satellites. It has been shown through a systematic analysis that a multimoded dielectric tube shows a dip in the boresight region which is suitable for satellite antennas.
10 citations
TL;DR: The edge-slot antenna as discussed by the authors is a class of circumferential-slot antennas that is ideally suited for conformal mounting on conducting bodies of revolution (BoV) and has a single coaxial stub at the center.
Abstract: A class of circumferential-slot antennas, called edge-slot antennas, that are ideally suited for conformal mounting on conducting bodies of revolution has been developed. The simplest form of the antenna is a disk of dielectric substrate that is copper-plated on both sides and mounted between two parts of the conducting body so that the aperture coincides with the surface. The antenna is excited by a single coaxial stub at the center and is tuned for proper operating frequency by inductive posts that connect the two copper-plated sides of the disk. By varying the number and location of the inductive posts the operating frequency of a disk can be tuned over a 6:1 range. Instantaneous bandwidths of three percent are typical. In practice, plated-through holes are used as inductive posts to provide mounting and access holes. The single coaxial feed excites azimuthally symmetric fields that are not significantly distorted by the symmetrically placed inductive posts. Therefore, radiation patterns of edge-slot excited bodies display a high degree of azimuthal symmetry. The small size, light weight, and inexpensive fabrication procedure make the edge-slot antenna attractive for many applications.
9 citations
01 Jan 1979
TL;DR: In this paper, the authors present a review of some recent advances in microwave reflector antennas, and places emphasis on the work of the Electromagnetics Applications Group at Queen Mary College (QMC).
Abstract: The paper presents a review of some recent advances in microwave reflector antennas, and places emphasis on the work of the Electromagnetics Applications Group at Queen Mary College (QMC). After a brief historical review, the following classes of antenna are considered: pencil beam, shaped beam, beam scanning and multiple beam. The operation of these antennas is described in nonmathematical terms and their performance constraints are identified. Many new antennas and feeds are illustrated and their operation discussed. In nearly all cases, they have resulted from innovation coupled with computer-aided design methods. The latter development distinguishes antenna developments of the last decade from those of the past. It is expected that this feature of antenna design will be exploited still more in the future.
9 citations
01 Jan 1979
TL;DR: A submitted manuscript is the version of the article upon submission and before peer-review as mentioned in this paper, while a published version is the final layout of the paper including the volume, issue and page numbers.
Abstract: • A submitted manuscript is the version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website. • The final author version and the galley proof are versions of the publication after peer review. • The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication
6 citations
TL;DR: Results show the feasibility of the antenna system described, which is made to reduce coupling between the transmitting point and the receiving point by a lossless network and coupled antennas.
Abstract: A coupled N-element antenna system on a mobile unit for simultaneous transmission and reception is discussed. A diplexer is required when an antenna for transmission and that for reception are installed with mutual coupling between them. An attempt is made to reduce coupling between the transmitting point and the receiving point by a lossless network and coupled antennas. The network is connected between the antenna and the input and output ports. The decoupled antenna is analyzed and theoretical and experimental results, which show the feasibility of the antenna system, are described.
5 citations
TL;DR: In this paper, the Directivity Index (DI) of a particular conformal array is calculated for a conical surface and the results include optimal (maximal DI) weighting of the array elements, as well as comparison with an appropriate planar array serving as a reference.
Abstract: Several comments are presented in response to an article by Frank, Kesner, and Gruen which concern their calculation of the Directivity Index (DI) of a particular conformal array In addition, independent results of calculations of the DI for a similar conformal array (elements distributed on a conical surface) are presented These results include optimal (maximal DI) weighting of the array’s elements, as well as comparison with an appropriate planar array serving as a reference
5 citations
TL;DR: In the review of the basic papers on parametric antennas published in 1963-1977 the main attention is given to the axial distribution of sound pressure and to the width of the directivity characteristic at low frequencies.
Abstract: The article is a review of the basic papers on parametric antennas published in 1963-1977. Parametric antennas that make it possible to obtain low-frequency radiation of very high directivity with a small aperture of primary source have recently become a subject of active research. Progress in the theory now makes it possible to obtain all the basic characteristics of an antenna. In the review the main attention is given to the axial distribution of sound pressure and to the width of the directivity characteristic at low frequencies. One of the basic shortcomings of such an antenna is low efficiency of parametric transformation. It is noted that regimes close to saturation are as yet insufficiently studied. Optimization of antenna parameters is necessary for improvement of its efficiency. An analysis of the basic experimental results shows that laboratory models of antennas with the primary frequency range of 0.5–1.5 MHz are not optimal. This, probably, is responsible for their efficiency being 10 dB lower than the theoretical value. In the review there are noted important possibilities of applications of such antennas in the field of underwater research.
3 citations
01 Oct 1979
Abstract: Interactions between co-sited antennas on airframes can seriously limit the performance of control, guidance and communications systems. Much ground and in-flight data has been gathered and laboratory investigations have indicated where improvements can be made. Empirical formulae have been developed which are applicable for both in-band and out-of-band frequencies.
3 citations
TL;DR: In this article, the role of aperture shape in influencing the far-zone radiation pattern in the vicinity of the main beam of horn-reflector antennas is examined, and the three major types of horn reflector antennas are considered-pyramidal, diagonal, and conical-and the influence of their aperture shape on the spatial character of antenna radiation is assessed.
Abstract: The role of aperture shape in influencing the far-zone radiation pattern in the vicinity of the main beam of horn-reflector antennas is examined. The three major types of horn-reflector antennas are considered-pyramidal, diagonal, and conical-and the influence of their aperture shape on the spatial character of antenna radiation is assessed.
08 May 1979
TL;DR: In this paper, the authors obtained some estimates for the effective sidelobe levels generated by scatterers in the main beam of the antenna by 1) ships and other discrete SCAs in the far field; 2) the sea in the near field; and 3) the ship's own superstructure in the Fresnel region.
Abstract: The far-field radiation patterns of radar antennas when installed aboard ships may differ substantially from their free-space or theoretical design radiation patterns. We obtain some estimates for the effective sidelobe levels generated by scatterers in the main beam of the antenna by 1) ships and other discrete scatterers in the far field; 2) the sea in the far field; and 3) the ship's own superstructure in the Fresnel region.
TL;DR: In this article, a local evanescent-wave tracking method was proposed for the analysis of large reflector and aperture antennas, which is based on local evane-centre tracking.
Abstract: A new method based on local evanescent-wave tracking is proposed for the analysis of large reflector and aperture antennas.
18 Jun 1979
01 Jan 1979
TL;DR: The final report for Naval Air Systems Command Contract on the mutual coupling effect in a conformal array is presented in this article, which contains a brief administrative summary plus three attachments which give the technical details.
Abstract: : This is the final report for Naval Air Systems Command Contract on the mutual coupling effect in a conformal array. It contains a brief administrative summary plus three attachments which give the technical details. (Author)
18 Jun 1979
01 Sep 1979
TL;DR: In this paper, the shape of the horn antenna was found by a combination of experimental and CAD-techniques, and four different antennas for various applications were presented, two for linear polarisation and two for arbitrary polarisation.
Abstract: The paper deals with new types of horn antennas with minimised lengths. Four different antennas for various applications are presented. The shape of these antennas was found by a combination of experimental and CAD-techniques. Providing a smooth transition in two steps from the 50? coaxial feeding cable to the aperture, these horns are capable of covering a frequency range of at least an octave. Two of the antennas are designed for linear polarisation, two others can receive or transmit any wanted polarisation by properly combining the signals of two orthogonal feeders. The horns are self-balanced with the exception of one unsymmetrical antenna for flange-mounting on metal surfaces. A special design with an optimum shaped central conductor is used to ensure sufficient decoupling and a minimum of phase and amplitude difference between the orthogonal channels of the horns for arbitrary polarisation.
18 Jun 1979