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.

Printed circuit board-configured dipole array having matched impedance-coupled microstrip feed and parasitic elements for reducing sidelobes

Abstract: To reduce sidelobes in the radiation pattern of a phased array dipole antenna, a plurality of parasitic antenna elements are provided adjacent to the array of dipole elements of the antenna. The driven elements of the dipole array and associated director elements are formed as patterned conductor elements on one surface of a thin dielectric substrate. Feed elements for the driven dipole array also comprise patterned conductor elements formed on an opposite surface of the substrate. The feed elements have a geometry and mutually overlapping projection relationship with the conductors of the driven dipole elements, so as to form a matched impedance transmission line through the dielectric substrate with the patterned dipole elements. The parasitic elements are formed on additional dielectric substrates spaced apart from and parallel to the thin dielectric substrate upon which the driven dipole array is formed.

Active Spherical Phased Array Design for Satellite Payload Data Transmission

Abstract: Spherical phased array antennas (SPAAs) are of particular interest for transmission of payload data of low earth orbiting (LEO) satellites to the ground stations. They can be designed to scan large part of the radiation sphere with constant directivity. This helps in designing highly agile spacecrafts. In this paper, practical design aspects of spherical arrays for achieving an optimum configuration to meet a specified goal are discussed. The new concept of sharing the hardware among the radiating elements and the effects of the failure of few of them are also studied in detail. Measured results of two arrays with completely different configurations but providing almost similar performance are discussed corroborating the design concept.

Theory of ESPAR Design With Their Implementation in Large Arrays

Abstract: A generalized formulation as well as a simple design approach is presented for electronically steerable parasitic array radiators (ESPAR). Based on the presented design procedure, a low-cost rectangular dielectric resonator parasitic phased array antenna is designed. An E-plane linear dielectric resonator phased array coupled to symmetric narrow slot apertures is investigated. The driven element is mutually coupled to the parasitic elements and reactive loads are utilized to control the phase to achieve a particular beam scanning direction. The use of low-cost reactive loads instead of expensive conventional phase shifters allows for more economic fabrication. Based on this design, a five elements planar array is designed and measured. In addition, a large array using ESPAR subarrays is presented.

A Printed Dipole Array With High Gain and Endfire Radiation

Abstract: A printed dipole array operating at 2.45 GHz with endfire radiation is designed by using the method of maximization of power transmission efficiency. The elements of the antenna array are driven by the distribution of excitations obtained from the optimization process. It is shown that a four-element array has an endfire gain of 9.6 dBi and a front-to-back ratio of 5.6 dB, both of which can be improved by either introducing a strip reflector or more elements. For a six-element array, the measurements and simulations indicate the endfire gain reaches 11.7 dBi and the front-to-back ratio is increased to 17.7 dB.

A Broadband High-Gain Bi-Layer LPDA for UHF Conformal Load-Bearing Antenna Structures (CLASs) Applications

Abstract: A broadband high-gain bi-layer log-periodic dipole array (LPDA) is introduced for conformal load bearing antenna structures (CLASs) applications. Under the proposed scheme, the two layers of the LPDA are printed on two separate thin dielectric substrates which are substantially separated from each other. A meander line geometry is adapted to achieve size reduction for the array. The fabricated and tested array easily exceeds more than an octave of gain, pattern, and VSWR bandwidth.