3 edition of Analysis of a generalized dual reflector antenna system using physical optics found in the catalog.
Analysis of a generalized dual reflector antenna system using physical optics
by National Aeronautics and Space Administration, For sale by the National Technical Information Service in [Washington, DC], [Springfield, Va
Written in English
|Statement||Roberto J. Acosta and Alan R. Lagin.|
|Series||NASA technical memorandum -- 105425.|
|Contributions||Lagin, Alan R., United States. National Aeronautics and Space Administration.|
|The Physical Object|
The mirror is composed of 28 segmented planar conducting plates, mostly one square meter in size. Based on a physical optics analysis, we have analyzed the secondary pattern of the antenna. For frequencies between 50 and GHz, and for a scan range of $\pm$ 8$\sp\circ$ ( beamwidths scan at GHz), the worst calculated beam efficiency is 95%.Author: Bijan Houshmand. a flat reflector such as used in a Short backfire antenna or Sector antenna. a corner reflector used in UHF television antennas. a cylindrical reflector as used in Cantenna. Design criteria. Parameters that can directly influence the performance of an antenna with integrated reflector: Dimensions of the reflector (Big ugly dish versus small.
Modern Methods of Reflector Antenna Analysis and Design (Artech House Antenna Library) [Scott, Craig R.] on *FREE* shipping on qualifying offers. Modern Methods of Reflector Antenna Analysis and Design (Artech House Antenna Library)Cited by: Reflector Antennas. Paraboloidal Reflectors. Antennas useful for radio astronomy at short wavelengths must have collecting areas much larger than the collecting area $\lambda^2 / (4 \pi)$ of an isotropic antenna and much higher angular resolution than a short dipole provides.
Reflector antenna analysis and design method mode numerical offset optics origin overall paraboloid pattern perturbation phase physical polarisation possible predicted present primary principle problem propagation properties radiation radiation pattern range receiving reference reflection reflector antenna region relation relative represent Reviews: 1. The displaced axis dual reflector has a main reflector with a ring focus where the subreflector fits within this ring so it does not block rays reflected from the main reflector. There are 4 types of ring-focus dual reflectors illustrated in the paper: Samuel Morgan, “ Some Examples of Generalized Cassegrainian and Gregorian Antennas.
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ANALYSIS OF A GENERALIZED DUAL REFLECTOR ANTENNA SYSTEM USING PHYSICAL OPTICS Roberto J. Acosta and Alan R. Lagin National Aeronautics and Space Administration Lewis Research Center Cleveland, Ohio ABSTRACT Reflector antennas are widely used in communication satellite systems because they provide high gain at low cost.
A computer program using physical optics-current integration method, has been developed for calculating the far-field antenna pattern of dual reflector antennas i11uminated by a feed with. Get this from a library. Analysis of a generalized dual reflector antenna system using physical optics.
[R Acosta; Alan R Lagin; United States. National Aeronautics and Space Administration.]. Analysis of Reflector Antennas provides information pertinent to the analysis of reflector-antenna systems.
This book provides an understanding of how design data have been and can be derived. Organized into four chapters, this book begins with an overview of the history of focusing reflector-antenna systems characterized by a highly variable.
Analysis of Low Side Lobe Reflector Antenna. the secondary pattern and directivity of a generalized dual reflector antenna system was developed and implemented at LeRC. using the physical. A comer reflector is shown in Figure Most comer reflectors have an angle of 90°, but other angles are also used.
The feed element of the comer reflector is almost always a dipole or an array of cylindrical dipoles placed parallel to the vertex at a distance d, as shown in the figure. Often, if the wavelength λ.
Abstract: In this paper, a modular technique is described for the analysis of dual-reflector antennas using a reflectarray as a subreflector. An antenna configuration based on a sub-reflectarray and a parabolic main reflector provides better bandwidth than a single reflectarray, and has a number of advantages compared with a conventional dual-reflector antenna.
tarray, and it is simpler to manufacture than a shaped reflector. The proposed antenna configuration cannot be analyzed using available commercial tools.
Some approximate techniques have been proposed for the analysis of dual-reflector antennas involving reflectarrays, but an analysis technique for a general sub-reflectar. Analysis of Reflector Antennas provides information pertinent to the analysis of reflector-antenna systems.
This book provides an understanding of how design data have been and can be derived. Organized into four chapters, this book begins with an overview of the history of focusing reflector-antenna systems characterized by a highly variable Book Edition: 1. Abstract. In this paper, a modular technique is described for the analysis of dual-reflector antennas using a reflectarray as a subreflector.
An antenna configuration based on a sub-reflectarray and a parabolic main reflector provides better bandwidth than a single reflectarray, and has a number of advantages compared with a conventional dual-reflector antenna. Presented in the paper is a generalized diffraction synthesis technique for single- and dual-reflector antennas fed by either a single feed or an array feed.
High versatility and accuracy are achieved by combining optimization procedures and diffraction analysis such as physical optics (PO) and physical theory of diffraction (PTD).Cited by: Secondary pattern computation of an offset reflector antenna [microform] / Roberto J.
Acosta; Analysis of a generalized dual reflector antenna system using physical optics [microform] / Roberto J. Modern utilizations of reflector antennas in radars, satellite communications and tracking, remote sensing, radio astronomy, and the like have resulted in the development both of sophisticated reflector antenna configurations and of analytical and experimental design techniques.
offset dual reflector antenna systems. Formulation The formulation can be divided in three parts as given as below; 1. Analyzing and design the equivalent parabolid antenna system by using the procedure that was given in . Finding the equivalent focus-fed feed instead of 3-D.
COMPUTER-AIDED ANALYSIS AND DESIGN; Introduction; The Use of Computers in the Analysis and Design of Large, Steerable Reflector Antennas; Computer Analysis and Design of a Complete Antenna System; References; APPENDIX: Derivation of the Vector Field Integrals.
dual-doubly-curved reflector geometry with particular emphasize on the modelling approach retained to accurately analyze the performance of the antenna system.
Fig. Dual reflector CPSS geometries equivalen to DGR in CP: in (a) a reciprocal and symmetrical CPSS, in (b) a non-reciprocal and symmetric. 3. Dual-reflector antennas The dual-reflector antenna consists of two reflectors and a feed antenna.
The feed is conveniently located at the apex of the main reflector. This makes the system mechanically robust, the transmission lines are shorter and easier to construct (especially in. Open-ended waveguides, horn antennas, horn radiation fields, horn directivity, optimum horn design, microstrip antennas, parabolic reflector antennas, gain and beamwidth of reflector antennas, aperture-field and current-distribution methods, radiation patterns of reflector antennas, dual-reflector antennas, lens antennas.
Ch Antenna Arrays. • Displaced Axis Reflector • Generalized Dual Reflector Transmission line • Return loss to reflected power loss • VSWR to reflected power loss • Return loss to VSWR • Peak voltage due to VSWR • Power de-rating due to VSWR.
consider here two setups. First, a Cassegrain dual reﬂector antenna, a typical benchmark for a Physical Optics code, designed from textbook formulas .
Second, we move to an actual application of a high-gain reﬂector antenna mounted on a satellite in low orbit, taken from an ongoing ESA project .
Cassegrain dual reﬂector. horn feeds is considered. Radiation patterns are computed using the physical-optics technique. The designed antenna is approximately 60X in diameter. Calculations performed for this antenna with three beams indicate that each beam has a gain of about 42 dB, a beamwidth of deg, and sidelobes that can be expected to be at least 28 dB Size: KB.Multiple Reflector Dish Antennas Paul Wade W1GHZ © [email protected] Introduction A dish antenna with multiple reflectors, like the Cassegrain antenna at OH2AUE1 in Figure 1, looks like an obvious solution to one of the major problems with dishes, getting RF to the Size: 1MB.If a Parabolic Reflector antenna is used for transmitting a signal, the signal from the feed, comes out of a dipole or a horn antenna, to focus the wave on to the parabola.
It means that, the waves come out of the focal point and strike the Paraboloidal reflector.