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