Integrated solar array and reflectarray antenna or ih anwith esats increasing cubesat downlink data rates to 100 mbps the integrated solar array and reflectarray antenna isara mission will demonstrate a reflectarray antenna that increases downlink data rates for cubesats from the existing baseline rate of 9. Basic theory of reflectarray antenna the proposed reflectarray is assumed to be composed of square patches on a grounded dielectric slab as shown in fig. Based on the relation between the patch size and the reflection phase, a progressive phase distribution is implemented on the patch array to create a reflector able to deflect an incident beam towards a predefined angle off the specular direction. Approximate analytical technique to design reflectarray antenna. An enabling technology for nasas dualfrequency ace radar paul e. Design of dualreflectarray antenna for beam scanning. Design and efficient analysis of large reflectarray antenna. The cloudsat antenna design is included as a point of reference. Results of a study to determine the feasibility and design limitations of a microstrip reflectarray antenna are presented. In this study, a single layer reflectarray antenna is proposed with variable patch sized unit cells and suggested for enhancing the bandwidth with small overall dimensions for x. Abstract in this paper a reflectarray design for a membrane spaceborne antenna to be used in a typical sar mission is presented. A wideband horn antenna is also designed as a feed antenna for the proposed reflectarray structure. The operating principle of a reflectarray antennasee fig. Study of different dualreflectarray antenna configurations for beamscanning applications c.
Approximate analytical technique to design reflectarray. Generally, radar and imaging systems call for antennas with large apertures and fast beamscanning capabilities. Characterization of loss and bandwidth performance of. The rf test results of the threemeter antenna demonstrated excellent radiation pattern characteristic. Design and fabrication of a wideband reflectarray antenna. Reflectarray membrane study for deployable sar antenna core. One of the main advantages of reflectarray antennas is the possibility of producing switching.
An xband highpower microwave antenna with arbitrarily elliptical polarization is proposed and investigated in this paper. They provide sufficient coverage of basic reflectarray theory to. They are often used in the vhf and uhf frequency bands. The present invention provides a high resolution scanning reflectarray antenna hrsra for the purpose of tracking ground terminals and space craft communication applications. Design and analysis of high performance reflectarray resonant.
A wideband reflectarray antenna consisting of single. Design of a parabolic reflector and reflectarray antenna for xband. To fulfill the dualfrequency requirements, elements are needed to resonate at two different, independently adjustably frequencies. Design and performance of a microstrip reflectarray antenna ieee. This site is like a library, use search box in the widget to get ebook that you want. Get doc electromagnetic modeling of reflectarray antennas. Click download or read online button to get reflectarray antennas book now. Integrated solar array and reflectarray antenna or ih. The distance travelled by the radiated waves to the noncentered patches is more as compared to the center patch 12.
A reflectarray antenna consists of a planar or conformal array of elements that are excited with a feed antenna. Pdf a brief overview of reflectarray antennas mainly focused on some. Figure 2 is the picture of the threemeter inflatable reflectarray antenna. However, due to their large size, analyzing the performance of these antennas using traditional full wave finitedifference and finiteelement techniques requires considerable computational resources. Reflectarray antenna design with double cutted ring. The unit cells are usually backed by a ground plane, and the incident wave reflects off them towards the direction of the beam. A deployable structure for use in establishing a reflectarray antenna comprising. It will also appeal to practicing engineers working on antenna development. Recent developments of reflectarray antennas in dual. The authors describe, in detail, design procedures for a wide range of applications.
Reflectarray antenna elements are analyzed by the infinite array theory, whereas a model based on the equivalence principle is applied to calculate the farfield pattern of a reflectarray system. The accurate analysis of electromagneticem scattering from such reconfigurable antenna structures is of great practical. Reflectarrays composed of resonant microstrip gold patches on a dielectric substrate are demonstrated for operation at terahertz frequencies. Experimental demonstration of a waveguide reflectarray. Download reflectarray antennas ebook pdf or read online books in pdf, epub, and mobi format. The proposed antenna is founded on a reflectarray composed of printed elements and excited by the microwave energy in the azimuthally symmetric mode. Download pdf reflectarray antennas free online new. Design of a bifocal single reflectarray antenna with.
Gain and bandwidth characterizations of reflectarray antennas. Second, results for beam scanning and contouredbeam applications in. Pdf analysis, design and applications of reflectarrays. The authors describe, in detail, design procedures for a wide range of applications, including broadband, multiband, multibeam, contourbeam, beamscanning, and conformal reflectarray antennas. Xband reflectarray antenna with arbitrarily elliptical. Osa experimental demonstration of reflectarray antennas. First, a general analysis technique for these two configurations is described. For the validation of this theory, reflectarrays printed above different materials. In this paper, we present an efficient method to accurately analyze these class of. A class of antennas that utilizes arrays of elementary antennas as reflecting surfaces has been investigated. In this dissertation, a general reflectarray system. Refleclion loss with variable dielectric substrate thickness where a4 is the change in the reflection phase in o degrees and af is the change in the resonant frequency 0. Both authors are well respected practitioners who have build these antennas and developed them for space flight. The reflectarray antenna takes advantages of both the reflector antenna and the array antenna, by spatially illuminating an array of phased antenna elements distributed on a planar surface.
In telecommunications and radar, a reflective array antenna is a class of directive antennas in which multiple driven elements are mounted in front of a flat surface designed to reflect the radio waves in a desired direction. This paper presents the concept of reflectarray in a novel way, utilizing a graphical visualization tool. This approach greatly facilitates understanding of the working of the reflectarray antenna, and provides an intuitive explanation for the reflectarray behavior. Describes the configuration and principles of a reflectarray antenna, its advantages over other antennas, the history of its development, analysis techniques, practical design procedures, bandwidth issues and wideband techniques, as well as applications and recent developments. Finally, the reflectarray antenna is fabricated and tested. Encinar ieee antennas and propagation society, sponsor wileyinterscience a. Reflectarray antenna has a high gain like parabolic reflectors. It illustrates the advantages of the reflectorreflectarray design in terms of performance and swap. General near field synthesis of reflectarray antennas for. A reflectarray antenna or just reflectarray consists of an array of unit cells, illuminated by a feeding antenna source of electromagnetic waves.
Microstrip reflectarray antennas present an alternative to conventional directive antennas in that they are flat, inexpensive, easy to install and. Scanning approaches for reflectarray antennas 304 10. A major drawback of reflectarray antennas is that phase compensation needs to be done for the noncentered patches. Millimeterwave singlelayer dualfrequency reflectarray. But, unlike the reflector, which has infinite bandwidth due to its curved surface, it has a narrow bandwidth due to a planar surface. Click download or read online button to reflectarray antennas book pdf for free now. This antenna, which has been proposed as a means to provide potential lowcost corporatefed phased arrays, utilizes microwave integrated circuit techniques to integrate the radiating element, phaseshifter components, dc distribution, and logic circuitry into a single. This chapter explores the basics of designing the phase distribution on the reflectarray aperture. Miniaturized microstrip reflectarray antenna design for ku.
Analysis of variable dielectric substrate thickness xband. The operating principle of a reflectarray antenna see fig. Abstractin this work, reflectarray antennas are proposed for their. Miniaturized microstrip reflectarray antenna design for kuband applications written by namrata v. Both dualreflector antenna with a reflectarray subreflector and dualreflectarrays antennas with flat or parabolic main reflectarray are considered. A low weight, low cost, and easy to fabricate singlelayer dualfrequency reflectarray is designed, fabricated, and measured, with gain values of 27 and 29. Microstrip reflectarray antenna for the scanscat radar. Design of dualreflectarray antenna for beam scanning ning performance, a phase is introduced into the sub reflectarray to emulate the optics corresponding to different virtual foci, associated to each beam direction, as own in. Gain calculation is a primary step in designing a reflectarray antenna and it is defined as a product of.
Design of a parabolic reflector and reflectarray antenna. Review article recent developments of reflectarray antennas for. A reflectarray antennas bandwidth is limited by two factors. Pdf research and development of reflectarray antennas. Reflectarray antennas analysis design fabrication and. Resonant elements for tunable reflectarray antenna design, m. Phase delays can be minimized by choice of reflector size and distance between the feed and reflector and by optimizing the phases of signals retransmitted by certain parts of the reflector. In recent years reflectarray antennas have received considerable attention due to their unique capabilities. A phase distribution of concentric rings is applied to focus the wavefronts from. Vhf examples are generally large and resemble a highway billboard, so they are. Reflectarray antenna has emerged as a new generation. A proper cp reflectarray element must highly suppress crosspolarized reflection with respect to the incident cp sense i. Kraus this text is for the course on antennas offered to the seniorgraduate level by most electrical engineering departments.
The feeding structure is a simple horn antenna located at the focal point of the reflectarray. Description of the microstrip reflectarray when many antenna elements with open or short circuited terminations are arranged in a planar aperture and are illuminated by a feed. The proposed reflectarray is assumed to be composed of square patches on a grounded dielectric slab as shown in. Reflectarray antennas download ebook pdf, epub, tuebl, mobi. Chang, design and performance of microstrip reflectarray antenna, ieee transactions on antennas and propagation, vol. The configuration and principles of a reflectarray antenna, and its advantages over other antennas antenna analysis techniques illustrated with photographs, drawings, and tables, this groundbreaking book is an important addition to any electrical engineers library, as well as critical to graduate students focused on antenna engineering and.
Theory, designs and applications payam nayeri, fan yang, atef. The text explains both the basic theory of antennas and its application to practical designs. Table 2 compares several different antenna design approaches. There are two steps in the design of a reflectarray, namely, the element design and the system design. Reconfigurable reflectarray antenna boasts 25,600 elements. The reflectarray element is characterized in a unit cell.
30 112 989 236 303 1030 1619 952 985 1150 1468 1407 1282 654 914 1369 1300 777 934 1001 1163 1140 364 648 940 204 135 345 246 956 788