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.

Modification of Sinuous Antenna Arms for UWB Radar Applications

Abstract: The sinuous antenna is modified to improve its performance for ultrawideband (UWB) radar applications. The radiated waveforms in the time domain of typical sinuous antennas contain a long ringing tail after the chirp-like main pulse when excited by a temporally short pulse. The ringing is due to resonances that are set up on the antenna arms and are essentially eliminated by modifying the shape of the arms. The first modification removes the sharp ends where the arms terminate, and the second changes the shape of the arms where they bend. These modifications are also shown to improve the gain flatness of the antennas. Three representative sinuous antennas are fabricated, tested, and demonstrated in a monostatic radar experiment. The measured results clearly show the advantages of the improved antenna.

A Switched-Beam Conformal Array With a 3-D Beam Forming Capability in C-Band

Abstract: A 12-element conical antenna array made of four linear subarrays regularly spaced by 90° is proposed in C-band for communication applications on high velocity flying platforms. The beam forming network is stacked below the radiating part, and allows steering the subarray beam of the conical array. The performance of the main building blocks is described in detail, both numerically and experimentally. The measured radiation characteristics of the phased array are in good agreement with the simulation results between 5 and 5.4 GHz for all configurations with beam pointing directions varying between 30° and 110° in the elevation plane.

Multibeam antennas based on phased arrays: An overview on recent ESA developments

Abstract: The aim of the paper is to provide an overview on the activities recently promoted by the European Space Agency (ESA) on satellite multibeam antennas based on phased arrays. The attention is focused on antennas generating multiple spot beams coverages with a single main aperture. In particular, solutions based on direct radiating arrays, active discrete lenses, and confocal reflectors will be discussed. These solutions present some challenges but also some advantages as compared to conventional architectures based on multi reflectors with a single feed per beam. ESA is supporting since several years activities in this challenging domain.

Adaptive antenna apparatus including a plurality sets of partial array antennas having different directivities

Abstract: An adaptive antenna apparatus comprises M receiving circuits, and N antenna elements, N being larger than M. The N antenna elements constitute a plurality of sets of partial array antennas each including M antenna elements among the N antenna elements, and a straight line passing through feeding points of two of the antenna elements included in any one of the partial array antennas has a different direction from a further straight line passing through feeding points of two of the antenna elements included in any one of the other partial array antennas. A control means adaptively controls the receiving circuits to adjust at least one of an amplitude and a phase of each radio frequency signal, and adaptively controls an antenna switching means to connect the antenna elements included in one of the plurality of sets of partial array antennas to their corresponding receiving circuits.

L-band phased array antennas for mobile satellite communications

Abstract: The planar phased array, due to its low profile and beam agility, has been proposed as one of the land vehicle antennas for the U.S. Mobile Satellite Experiment (MSAT-X) program. The objective is to develop medium gain satellite tracking antennas (as versus omni low gain antennas) that will alleviate the spacecraft power burden through higher gain, and enable multiple-satellite operation in the same frequency band through narrower beam. In addition, this narrower beam can spatially filter out a significant portion of the undesired multipath component. The major challenges are to seek technologies that will minimize the antenna insertion loss, achieve accurate beam pointing with sufficient inter-satellite isolation, and minimize the antenna production cost.