Topic
Phased array
About: Phased array is a research topic. Over the lifetime, 19428 publications have been published within this topic receiving 229231 citations. The topic is also known as: Phased Array Radar, PAR.
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TL;DR: In this paper, a conformal array is implemented using the $8 \times 8$ single-polarized radiating elements that are axially mounted onto a cylindrical surface with a radius of 150 mm, and the experimental results demonstrate that the array achieves active VSWR less than 3.0 over a bandwidth of 6-18 GHz (3:1), within a wide-scanning range of ±60° in two principal planes.
Abstract: A practical implementation of wideband and wide-scanning cylindrically conformal phased array is presented in this communication. First, the design of a dual-polarized planar array is introduced in advance. Then, as a preliminary performance investigation of a conformal phased array, a single-polarized array element counterpart is developed from the dual-polarized planar array with simple modifications. Finally, a conformal array is implemented using the $8 \times 8$ single-polarized radiating elements that are axially mounted onto a cylindrical surface with a radius of 150 mm. A conformal array prototype is fabricated and measured. The experimental results demonstrate that the array achieves active VSWR less than 3.0 over a bandwidth of 6–18 GHz (3:1), within a wide-scanning range of ±60° in two principal planes. The measured results are in good accordance with the simulations, thus validating the performances of the proposed wideband and wide-scanning cylindrically conformal phased array.
56 citations
TL;DR: In this article, a general solution for a class of printed antenna geometries composed of multiple dielectric layers or ground planes, radiating patches, dipoles, or slots, and an arbitrary configuration of multiple transmission lines proximity-coupled or aperture-cooperative to the radiating elements is given.
Abstract: A general solution is given for a class of printed antenna geometries composed of multiple dielectric layers or ground planes, radiating patches, dipoles, or slots, and an arbitrary configuration of multiple transmission lines proximity-coupled or aperture-coupled to the radiating elements. The solution uses a full-wave spectral-domain moment method approach, and a new generalized multiport scattering formulation to model the excitation from the multiple feed lines. This method treats infinite phased arrays as well as isolated elements. The general theory using the new multiport scattering formulation is elaborated, with details of the key analytical and numerical aspects. Considering the unified nature of the multiport scattering analysis, and its simplicity, this analysis is appropriate for computer simulation of a large variety of multilayered microstrip antennas involving radome layers, dual polarized feeds, proximity-coupled or aperture-coupled elements, multifeed stacked or parasitic patches, and several related configurations for integrated phased array applications. >
56 citations
TL;DR: In this article, an optical true time-delay (TTD) scheme for two-dimensional (2-D) X-band phased array antennas (PAAs) has been proposed, which is composed of a multiwavelength optical source and a delay line matrix consisting of 2times2 optical microelectromechanical system (MEMS) switches with fiber-optic delay lines connected between cross ports.
Abstract: An optical true time-delay (TTD) scheme for two-dimensional (2-D) X-band phased array antennas (PAAs) has been proposed. It is composed of a multiwavelength optical source and a delay line matrix consisting of 2times2 optical microelectromechanical system (MEMS) switches with fiber-optic delay lines connected between cross ports. A 2-bit times 4-bit optical TTD for 10-GHz 2-D PAAs has been implemented by cascading a wavelength-dependent TTD (WD-TTD) with a unit time delay of 12 ps in the x-direction and a wavelength-independent TTD (WI-TTD) with that of 6 ps in the y-direction. The time delay error for WD-TTD was measured to be less than 2.8 ps, mainly due to jitter incurred from gain-switching. On the other hand, the error for WI-TTD was less than 0.8 ps, which is within the equipment resolution. Insertion loss of both delay line matrices was less than 1 dB due to the column-wise control of the MEMS switches. This prevents the feed current applied to each antenna element from fluctuating at any radiation angles so that antenna gain and sidelobe level do not deteriorate in this scheme
56 citations
13 Jun 1999
TL;DR: In this article, the design and performance of two different chip sets for 11.7 to 12.7 GHz DBS receive phased arrays are described, which exhibit state-of-the-art noise figure and phase shift performance.
Abstract: The design and performance of two different chip sets for 11.7 to 12.7 GHz DBS receive phased arrays are described. Both chip sets exhibit state of the art noise figure and phase shift performance; are extremely compact and power efficient; and are of very high yield to minimize cost.
56 citations
22 Jan 2016
TL;DR: The advantages of digital beamforming, both generally and specific to satellite communications antennas, and some of its early implementations are discussed, and technology options for DBF implementation in a spaceborne phased array are considered.
Abstract: This paper discusses the advantages of digital beamforming (DBF), both generally and specific to satellite communications antennas, and briefly describes some of its early implementations. A discussion of recent advances in analog-to-digital converter (ADC) technology is followed by a description of the basic DBF functionality and tradeoffs in functional partitioning in a DBF array. The application of DBF to a heritage phased array is described to illustrate the benefits of DBF for spaceborne phased arrays. Finally, technology options for DBF implementation in a spaceborne phased array are considered.
56 citations