Reflector and lens antennas gothenburg, sweden, 5 9 december 2011 coordinator p. Matched and wideband flat lens antennas using symmetric. They can easily achieve gains of above 30 db for microwave frequencies. Circular and rectangular horn antennas lens corrected antennas. Reflector antennas paraboloidal reflectors antennas useful for radio astronomy at short wavelengths must have collecting areas much larger than the collecting area o4u of an isotropic antenna and much higher angular resolution than a.
The recent advent of millimeterwave technology and the increasing demand for higher frequencies have stimulated a renewed interest in the design of lens antennas for radar and communication systems. Reflector systems are probably the most widely used highgain antennas. Similar to radiowave and microwave antennas, their purpose is to convert the energy of free propagating radiation to localized energy, and vice versa. Wheeler applications prize paper award, and the 2007 s.
Because this topic has not been thoroughly publicized, its importance is underestimated. Ppt reflector antennas powerpoint presentation free to. The antennas, which we have discussed till now, used the plane surface. The gregorian and cassegrain types, sometimes generically referred to as dual optics antennas, utilize a secondary reflector, or subreflector, allowing for better control over the c olimnated beam as well as allowing the antenna feed system to be more compact. A parabolic dish this size has no advantage in gain over the corner reflector, so its simplicity of design and construction make it attractive. Selectable subreflector antenna esas artes programmes. Eindhoven university of technology master design and analysis. Rahmatsamii jet propulsion laboratory, pasadena, california 9 1 109 r. One main advantage of lenses over reflectors is that the feed and its supporting. Lee, numerical methods make lens antennas practical, microwave, pp. Modern lens antennas for communications engineering. Parabolic dish antennas can provide extremely high gains at microwave frequencies.
The radiation fields from aperture antennas, such as slots, openended waveguides, horns, reflector and lens antennas, are. Analysis of radiation patterns and feed illumination of the. The lens antennas are used for higher frequency applications. Pier c online printed compact lens antenna for uhf band. Following are the types of antennas according to the physical structure. But at that time, they were supplanted by reflector antennas, less bulky and lighter at microwaves. The product developed in the frame of this artes34 project will complement thales alenia space in orbit missions flexibility solutions portfolio with an antenna solution based on conventional technologies and building blocks cfrp reflectors and structure, feed, rotary actuators offering high rf performances large bandwitdth, pim free, able to work on all ku band spectrum with a tri. He has published extensively and holds three patents on array and reflectarray antennas. A new microwave lens antenna suitable for ultrahigh frequency uhf. Data are presented which show that spherical reflectors possessing relatively high gain 40 db and very small phase path. Reflector antennas utilize curvatures called conic sections.
Definitions and experimental study on a hypothetical hard. Acosta nasa lewis research center, cleveland, ohio 445 abstract. Pdf a comparison of reflector antenna design for wideangle. Antennas and propagation ranga rodrigo may 2, 2010 lecture notes are fully based on books, balanis 1 kraus etal. Review of lens antenna design and technologies for mmwave shapedbeam applications. Optical antennas exploit the unique properties of metal nanostructures, which behave as strongly. The authors compare the ability of six single and dual reflector designs to scan up to 300 beamwidths in order to determine the feasibility of wideangle scans using reflector antennas. Winner of the standing ovation award for best powerpoint templates from presentations magazine. Reflectarray antennas john huang, jose antonio encinar. Houshmand university of illinois at urbanachampaign, urbana, illinois 61 801 y. Modern lens antennas for communications engineering is an excellent resource for rfmicrowave engineers, designers, and researchers in academia and industry, and anyone wishing to learn how to take full advantage of lens antennas and their many useful and interesting properties.
Introduction highgain antennas are required for longdistance radio communications radiorelay links and satellite links, highresolution radars, radioastronomy, etc. Lenses are very flexible and simple to design and fabricate. Instead of using t he conventional t runcated power series expansion approximation, thc newtons iteration formula for square root is used. The lens integrated antennas have been previously investigated by various researchers as 5.
Pdf dielectric lens antennas are attracting a renewed interest for millimeter and. It gives graduates and rfmicrowave professionals the design insights in order to make full use of lens antennas. A comparison of reflector antenna designs for wideangle scanning. Novel multiple phase centre reflector antenna for gmti radar. The first reflector system was made by hertz back in 1888 a cylindrical reflector fed by a dipole. Antenna gain enhancement and beamshaping using a diffractive optical element doe lens by christopher torbitt a thesis submitted in partial fulfillment of the requirements of the degree of master of science in electrical engineering approved by. The thickness of lens antennas can be reduced with the help of zoning.
Sabbadini european space agency, noordwijk, the netherlands. Woo telecommunications division a spherical reflector with multiple feeds is an attractive possibility for application in future communications satellite systems. Matched and wideband flat lens antennas using symmetric graded dielectrics. Reflector antennas introduction highgain antennas are required for longdistance radio communications radiorelay links and satellite links, highresolution radars, radioastronomy, etc. Optical antennas are an emerging concept in physical optics. Over 10 million scientific documents at your fingertips. Lens antennas are made up of glass, where the converging and diverging properties of lens are followed. The major advantages of lens antennas are narrow beamwidth, high gain, low sidelobes and low noise temperature. Theyll give your presentations a professional, memorable appearance the kind of sophisticated look that todays audiences expect. Additionally, reflectorlens antennas are introduced using twodimensional sgd. The lens antennas use the curved surface for both transmission and reception. Lens antennas are used in radar and metering equipment that operates in the centimeter wavelength range. Fresnel region fields of circular aperture antennas l mingkuei hu july 5, 1960.
In this video, i have explained reflector antenna by following outlines. Contents 1 introduction 1 2 types of antennas 3 3 radiation mechanism 5 4 current distribution on a thin wire antenna 9. If the frequency is less than 3000 mhz, lens antennas have more thickness. Schelkunoff transactions prize paper award, given by ieee antennas and propagation society. It means that, the waves come out of the focal point and strike the paraboloidal reflector. Worlds best powerpoint templates crystalgraphics offers more powerpoint templates than anyone else in the world, with over 4 million to choose from.
You will learn about these antennas in later chapters. Fresnel region fields of circular aperture antennas. Adaptive cancellation of stationary clutter for a ground moving target indicator gmti radar requires antenna sensing using multiple apertures. Kraus this text is for the course on antennas offered to the seniorgraduate level by most electrical engineering departments. Refractive index cv zoning is classified into two types. Pdf this chapter presents the integrated lens antenna ila.
This wave now gets reflected as collimated wave front, as discussed previously. Analysis and design using personal computers carlyle j. Dielectric lens antennas are attracting a renewed interest for millimeter and submillimeterwave applications where they become compact, especially for configurations with integrated feeds usually referred as integrated lens antennas. Peter meincke from ticra will present design and analysis techniques for reflector antennas. As in a reflector, these structures transform a spherical wave emanating from a feed into a collimated beam plane wave, with the advantage that the spacefed. Antenna gain enhancement and beamshaping using a diffractive. Pdf antenna and wave propagation notes pdf awp notes sw. Layered lens antennas ieee conference publication ieee xplore. A lens antenna consists of a lens proper and of a feed. Dielectric lens antennas are attracting a renewed interest for millimeter and submillimeterwave applications. Paraboloidal reflectors antennas useful for radio astronomy at short wavelengths must have collecting areas much larger than the collecting area o4u of an isotropic antenna and much higher angular resolution than a short dipole provides. This chapter is subdivided into two sets of antennas that function on similar principles. Design of optically transparent antenna with directional.
It will also appeal to practicing engineers working on antenna development. Department of commerce rebecca blank, acting secretary. Delft university of technology a dualpolarized leaky lens. Antenna and wave propagation pdf notes book starts with the topics covering antenna basics, thin linear wire antennas, antenna arrays. Lens antenna article about lens antenna by the free dictionary. Wire antennas aperture antennas reflector antennas lens antennas micro strip antennas array antennas frequency of operation. The text explains both the basic theory of antennas and its application to practical designs. Oct 06, 2017 reflector and lens antennas gothenburg, sweden, 26 october 2017 the course is divided in five parts. Corner reflector antennas are particularly suitable in applications where a broadband directional antenna around one to 1 12 wavelengths in size is needed.
An optically transparent antenna with directional radiation pattern is proposed in this paper. Reflector antennas operate on principles known long ago from the theory of geometrical optics. Shaped integrated lens antennas ilas are attractive for beamshaping applications at millimeter waves and. An aperture synthesis technique for cylindrical printed lens. Subefficiencies in reflector antennas excl blockage. Circular and rectangular horn antennas features standard gain low side lobes ridged configuration gold plated finishing low cost antenna range reference radiation element for subsystems applications ach and arh series circular and rectangular gain horns are offered for the frequency range of 18 to 110 ghz. Small hemielliptic dielectric lens antenna analysis in 2d. The aim of this book is to present the modern design principles and analysis of lens antennas.
As antennas play a key role in communication systems, recent development in wireless communications would indeed benefit from the characteristics of lens antennas. Antenna models for electromagnetic compatibility analyses. A perspective on the past, present, and future yahya rahmatsamii1 and randy l. This antenna consists of a radiation patch above the transparent glass substrate and a frequency selective surface acting as the ground of microstrip antenna on the back of the glass. For frequencies above k uband the penalty in weight and size associated with a lens is relatively small. While the reflector is known for shaping a beam in a particular direction based on the location of a feed antenna by using a reflecting aperture, a lens achieves a shaped beam by diffracting the signal from the source antenna. Kildal chalmers involved institutions summary the course is divided in five parts. An improved bowtie antenna and a planar metamaterial lens design is presented.