Topic
Reflective array antenna
About: Reflective array antenna is a research topic. Over the lifetime, 4366 publications have been published within this topic receiving 57884 citations.
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01 Oct 1976
TL;DR: Computed data based upon analytical models of the antennas and experimental results obtained from antennas constructed for operation at 30 GHz are presented for applications which include both communications and tracking radars.
Abstract: In many practical applications the performance of offset parabolic reflector antennas are limited by the reflectors' depolarising and beam-squinting properties. The paper describes progress in the development of a new class of primary-feed antennas which overcome these major limitations. Computed data based upon analytical models of the antennas and experimental results obtained from antennas constructed for operation at 30 GHz are presented for applications which include both communications and tracking radars.
13 citations
Proceedings Article•
01 Jan 2004
TL;DR: In this paper, a genetic algorithm was used to find the configurations with the lowest side-lobe level for sparse array configurations consisting of dielectric-filled, open-ended waveguide antennas.
Abstract: A design technique for sparse array configurations consisting of dielectric-filled, open-ended waveguide antennas is discussed. The position of the elements in the thinned array are determined by applying a genetic algorithm that searches for configurations with the lowest side-lobe level. By employing as design parameter the relative inter-element spacing, the formulated optimization problem allows for an arbitrary deployment of the elements on the aperture. The design strategy accounts for the mutual coupling between elements, as well. To this end, an efficient technique for estimating the Generalized Scattering Matrix of a-periodic arrays is proposed.
13 citations
TL;DR: The optimized antenna geometries that resulted from the above method seem to be significantly better than the respective ones derived from the classical design method.
Abstract: A powerful evolutionary method called Invasive Weed Optimization (IWO) is applied to achieve optimal designs of log-periodic antennas. The antennas are designed for operation in the UHF-TV band, i.e. 470–860 MHz, and are optimized with respect to the standing wave ratio (SWR), the front-to-rear (F/R) ratio, and the forward gain. The parameters under optimization are the dipole lengths, the dipole diameters, the distances between adjacent dipoles and the characteristic impedance of the transmission line that feeds the dipoles. The optimized antenna geometries that resulted from the above method seem to be significantly better than the respective ones derived from the classical design method.
13 citations
TL;DR: It is shown that the frequency for maximum voltage across the load with skin as the material is 700 MHz and that resonant bare dipoles have a practical length and that insulated dipoles provide comparable voltages with the same antennas and loads at 3 GHz.
Abstract: A quantitative study is made of the receiving qualities of antennas embedded a short distance below the surface of a dissipative material in terms of the complex transfer function and the properties of the antenna. Types of antennas investigated include bare and insulated dipoles as single elements and in two-element broadside arrays. The eccentrically insulated dipole is also studied. Actual voltages across practical load impedances are determined when the antennas are embedded specifically at depths of 0.1, 0.5, and 1.0 cm in hide or skin. Comparable results apply also to muscle. A similar but more involved analysis is required if quantitative account is to be taken of a subcutaneous layer of fat between the skin and muscle. It is shown that the frequency for maximum voltage across the load with skin as the material is 700 MHz and that resonant bare dipoles have a practical length. However, the higher directivity of insulated dipoles provides comparable voltages with the same antennas and loads at 3 GHz.
13 citations
02 Jun 2013
TL;DR: In this article, a liquid-metal reconfigurable Yagi-Uda monopole array is presented, which consists of driven and parasitic elements whose lengths can be tuned with pressure-driven liquid metal.
Abstract: A liquid-metal reconfigurable Yagi-Uda monopole array is presented. The three-element array consists of driven and parasitic elements whose lengths can be tuned with pressure-driven liquid metal, resulting in an array in which directors can be transformed into reflectors, and in which elements can be tuned to different frequencies. The measured radiation patterns demonstrate single-axis beam steering at multiple operational frequencies from 1.95 to 4.11 GHz.
13 citations