Pdf a brief overview of reflectarray antennas mainly focused on some. Design and analysis of high performance reflectarray resonant. Characterization of loss and bandwidth performance of. The feeding structure is a simple horn antenna located at the focal point of the reflectarray. Recent developments of reflectarray antennas in dual. Reflectarray antenna has emerged as a new generation. 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. Figure 2 is the picture of the threemeter inflatable reflectarray antenna. 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. This paper presents the concept of reflectarray in a novel way, utilizing a graphical visualization tool.
Design of a parabolic reflector and reflectarray antenna for xband. An enabling technology for nasas dualfrequency ace radar paul e. 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. Both dualreflector antenna with a reflectarray subreflector and dualreflectarrays antennas with flat or parabolic main reflectarray are considered. Experimental demonstration of a waveguide 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 distance travelled by the radiated waves to the noncentered patches is more as compared to the center patch 12. Pdf analysis, design and applications of reflectarrays. The authors describe, in detail, design procedures for a wide range of applications.
In this dissertation, a general reflectarray system. 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. They are often used in the vhf and uhf frequency bands. But, unlike the reflector, which has infinite bandwidth due to its curved surface, it has a narrow bandwidth due to a planar surface. In this paper, we present an efficient method to accurately analyze these class of. The text explains both the basic theory of antennas and its application to practical designs.
They provide sufficient coverage of basic reflectarray theory to. Approximate analytical technique to design reflectarray. To fulfill the dualfrequency requirements, elements are needed to resonate at two different, independently adjustably frequencies. Finally, the reflectarray antenna is fabricated and tested. General near field synthesis of reflectarray antennas for. Read electromagnetic modeling of reflectarray antennas online download pdf electromagnetic modeling of reflectarray antennas. Gain and bandwidth characterizations of reflectarray antennas. Abstractin this work, reflectarray antennas are proposed for their. A class of antennas that utilizes arrays of elementary antennas as reflecting surfaces has been investigated. Scanning approaches for reflectarray antennas 304 10. One of the main advantages of reflectarray antennas is the possibility of producing switching.
Generally, radar and imaging systems call for antennas with large apertures and fast beamscanning capabilities. An xband highpower microwave antenna with arbitrarily elliptical polarization is proposed and investigated in this paper. Study of different dualreflectarray antenna configurations for beamscanning applications c. Xband reflectarray antenna with arbitrarily elliptical. Millimeterwave singlelayer dualfrequency reflectarray. Resonant elements for tunable reflectarray antenna design, m. The authors describe, in detail, design procedures for a wide range of applications, including broadband, multiband, multibeam, contourbeam, beamscanning, and conformal reflectarray antennas.
The accurate analysis of electromagneticem scattering from such reconfigurable antenna structures is of great practical. A wideband reflectarray antenna consisting of single. Reflectarrays composed of resonant microstrip gold patches on a dielectric substrate are demonstrated for operation at terahertz frequencies. Download reflectarray antennas ebook pdf or read online books in pdf, epub, and mobi format. Miniaturized microstrip reflectarray antenna design for kuband applications written by namrata v. A low weight, low cost, and easy to fabricate singlelayer dualfrequency reflectarray is designed, fabricated, and measured, with gain values of 27 and 29. 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. Table 2 compares several different antenna design approaches.
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. Approximate analytical technique to design reflectarray antenna. This approach greatly facilitates understanding of the working of the reflectarray antenna, and provides an intuitive explanation for the reflectarray behavior. Reflectarray antennas analysis design fabrication and.
Second, results for beam scanning and contouredbeam applications in. The rf test results of the threemeter antenna demonstrated excellent radiation pattern characteristic. 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. Reflectarray antenna design with double cutted ring. Pdf research and development of reflectarray antennas. Osa experimental demonstration of reflectarray antennas.
In recent years reflectarray antennas have received considerable attention due to their unique capabilities. A reflectarray antenna consists of a planar or conformal array of elements that are excited with a feed antenna. A wideband horn antenna is also designed as a feed antenna for the proposed reflectarray structure. This site is like a library, use search box in the widget to get ebook that you want. A phase distribution of concentric rings is applied to focus the wavefronts from. The proposed antenna is founded on a reflectarray composed of printed elements and excited by the microwave energy in the azimuthally symmetric mode. Design of a parabolic reflector and reflectarray antenna. 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. A reflectarray antenna or just reflectarray consists of an array of unit cells, illuminated by a feeding antenna source of electromagnetic waves. The operating principle of a reflectarray antenna see fig. The operating principle of a reflectarray antennasee fig.
This chapter explores the basics of designing the phase distribution on the reflectarray aperture. The present invention provides a high resolution scanning reflectarray antenna hrsra for the purpose of tracking ground terminals and space craft communication applications. A major drawback of reflectarray antennas is that phase compensation needs to be done for the noncentered patches. Design and fabrication of a wideband reflectarray antenna. Theory, designs and applications payam nayeri, fan yang, atef. Get doc electromagnetic modeling of reflectarray antennas. Gain calculation is a primary step in designing a reflectarray antenna and it is defined as a product of. A reflectarray antennas bandwidth is limited by two factors. Vhf examples are generally large and resemble a highway billboard, so they are. Review article recent developments of reflectarray antennas for. Design and efficient analysis of large reflectarray antenna. Design of a bifocal single reflectarray antenna with.
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. However, due to their large size, analyzing the performance of these antennas using traditional full wave finitedifference and finiteelement techniques requires considerable computational resources. A proper cp reflectarray element must highly suppress crosspolarized reflection with respect to the incident cp sense i. 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. Reconfigurable reflectarray antenna boasts 25,600 elements. Reflectarray membrane study for deployable sar antenna core.
Abstract in this paper a reflectarray design for a membrane spaceborne antenna to be used in a typical sar mission is presented. Analysis of variable dielectric substrate thickness xband. Microstrip reflectarray antenna for the scanscat radar. Results of a study to determine the feasibility and design limitations of a microstrip reflectarray antenna are presented. The required phase distribution on the surface of the reflectarray is. The unit cells are usually backed by a ground plane, and the incident wave reflects off them towards the direction of the beam. There are two steps in the design of a reflectarray, namely, the element design and the system design. The cloudsat antenna design is included as a point of reference. The reflectarray is designed for two frequency bands. The reflectarray element is characterized in a unit cell. A deployable structure for use in establishing a reflectarray antenna comprising.
Although phasedarray antennas have been accepted as a rather natural fit for such applications, electronically. Miniaturized microstrip reflectarray antenna design for ku. The proposed reflectarray is assumed to be composed of square patches on a grounded dielectric slab as shown in. Design and performance of a microstrip reflectarray antenna ieee. 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. Encinar ieee antennas and propagation society, sponsor wileyinterscience a. Kraus this text is for the course on antennas offered to the seniorgraduate level by most electrical engineering departments. Integrated solar array and reflectarray antenna or ih. Chang, design and performance of microstrip reflectarray antenna, ieee transactions on antennas and propagation, vol. Design of dualreflectarray antenna for beam scanning. First, a general analysis technique for these two configurations is described. For the validation of this theory, reflectarrays printed above different materials. Click download or read online button to get reflectarray antennas book now. It illustrates the advantages of the reflectorreflectarray design in terms of performance and swap.
It will also appeal to practicing engineers working on antenna development. Reflectarray antennas download ebook pdf, epub, tuebl, mobi. Both authors are well respected practitioners who have build these antennas and developed them for space flight. Microstrip reflectarray antennas present an alternative to conventional directive antennas in that they are flat, inexpensive, easy to install and. Reflectarray antenna has a high gain like parabolic reflectors. 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. Holzeriplaw, pc dba holzer patel drennan 216 16th street suite 50, denver, co, 80202, us. Download pdf reflectarray antennas free online new.
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