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1 edition of A computer model for the transmission characteristics of dielectric radomes found in the catalog.

A computer model for the transmission characteristics of dielectric radomes

Robert M. Francis

A computer model for the transmission characteristics of dielectric radomes

by Robert M. Francis

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  • 35 Currently reading

Published by Naval Postgraduate School, Available from the National Technical Information Service in Monterey, Calif, Springfield, Va .
Written in English


Edition Notes

ContributionsJenn, David C.
The Physical Object
Pagination116 p. ;
Number of Pages116
ID Numbers
Open LibraryOL25496209M

Radomes can be made from a single electrically thin dielectric layer [6] or a sandwich, which has two dielectric layers with an alternative material between them as a core at its simplest [7]. This paper presents a novel and improved process to define the optimised thickness of a single walled radome. Since the conductors in stripline are completely surrounded by dielectric material, when modeling stripline transmission lines, the Dk of the circuit material is the numerical value that can be applied to a model. In some stripline designs, such as multilayer circuits, several types of dielectric materials may be used in a circuit assembly.

In this study, two radome analysis computer programs were "investigated. Both codes were developed by G. K. Huddleston, H. L. F3assett, and J. M. Newton at the Gec-gia Institute of Technology.1 7 The first computer code investigated was the Surface Integration --adome Analysis Computer . these, the two-port transmission line techniques30,31 are presently widely used. In general, these techniques make use of the reflected and/or transmitted waves by and through a dielectric-filled transmission line to analytically or numerically determine the dielectric properties of the material. In addition, the two-.

Equipped with a rugged radome for protection against ice and harsh weather, the economical DCR-T-R antenna brings the benefits of Dielectric`s popular FM ring-style series to low-power applications. Along with all radiating elements, the kit comes complete with jumpers and power dividers for fast installation. Ideal for Class A and B stations Circularly polarized Branch feed Field-adjustable.   Digital Transmission Lines: Computer Modeling and Analysis adopts a unique approach which offers the reader an intuitive understanding of the causes and nature of crosstalk as well as the conceptual and mathematical tools to control it. It begins with an introduction to the transmission line equations, progresses to the solution for the signals on networks of multi-wire lines in layered Reviews: 1.


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A computer model for the transmission characteristics of dielectric radomes by Robert M. Francis Download PDF EPUB FB2

Calhoun: The NPS Institutional Archive Theses and Dissertations Thesis Collection A computer model for the transmission characteristics of dielectric radomes. A Computer Model for the Transmission Characteristics of Dielectric Radomes by Robert M. Francis Lieutenant, United States Navy B.S., University of Houston Submitted in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE IN ELECTRICAL ENGINEERING from the NAVAL POSTGRADUATE SCHOOL March, Author: A Y Robert M.

Francis. A COMPUTER MODEL FOR THE TRANSMISSION CHARACTERISTICS OF DIELECTRIC RADOMES. By Udleyknc Irary, Qf Tmis Page, B Declassification Downgrading Schedule and Francis Robert M.

Abstract (If applicable Topics: NO TASK NO WORK UNIT ACCESSION NO 1. This chapter illustrates the analogy between the analysis of a multilayer sandwich radome and its transmission line model.

This analogy is important because it enables us to use all developed tools and concepts in transmission line analysis for the sandwich radome design. Mahima P., Suprava M., Vandana S., Yazeen M.P.S., Nair R.U. () EM Characteristics of Planar Slab Model of Graded Dielectric Inhomogeneous Planar Structure.

In: Electromagnetic Performance Analysis of Graded Dielectric Inhomogeneous Radomes. SpringerBriefs in Applied Sciences and Technology. Springer, Singapore. First Online 15 March Author: P.

Mahima, M. Suprava, S. Vandana, Mohammed P. Yazeen, Raveendranath U. Nair. When the thickness of face materials was about mm and the size (a, b) and array periodicity (δ a, δ b) of dipoles from the electromagnetic simulation were 1 mm, 13 mm, 4 mm, and 17 mm, the electromagnetic transmission characteristics of the low-observable radomes were measured with respect to the density of core materials.

A modified Paris' model (Paris, ) for computed-aided radome analysis is presented, which takes into account the dielectric material anisotropy of the radome layers. ESSCO dielectric space frame radomes perform very well at frequencies below GHz with performance nulls at other discrete frequencies. To improve DSF RF performance above GHz, “beam tuning” techniques have been developed, whereby the inclusion of tuning wires or grids in the beams can reduce the blockage and scattering levels.

The book also includes a detailed description of radomes and antenna-radome interaction studies for different radome wall configurations. The radome wall was designed using the equivalent transmission line method (EQTLM), since it requires less computational speed and provides accurate results.

Dielectric constant and loss together specify the transmission efficiency of a radome antenna system and are ideally measured at the intended operating frequencies.

The lower the dielectric constant and loss, the lower powered the antenna systems have to be, and the smaller the effect of the radome on the antenna performance. Nosecone radomes of hypersonic flight vehicles show degradation of electromagnetic (EM) performance characteristics due to variations in the dielectric parameters (dielectric constant and electric.

Construction Characteristics* Multi-layer construction; doubly-curved polygonal panels bolted together to form truncated sphere. Shell made of highly developed composites for panel consistency and strength. Pre-impregnated fiberglass skins fully enclose each panel core to make panels weather-tight.

Figure Two-port model of a transmission line. In the beginning the transmission line is developed as a lumped element circuit, but then a limit is taken to convert the circuit model into a distributed element circuit – Distributed element means that element values such as R, L, and Cbecome R, L, and Cper unit length of the line.

transmission (> 80 o/c) over a 3 to 4o/c frequency band will be discussed. The use of a simplified radome mathematical model provides for a quick and easy initial design, but this usually requires modification by empirical laboratory techniques.

It is significant, however, that regardless of the modifications required, a. Dielectric Space Frame Organization of the Book References 2 Sandwich Radomes Transmission Line Analogy Multilayer Analysis Single Layer A-Sandwich B-Sandwich C-Sandwich References Problems 3 Frequency Selective Surfaces (FSS) Radomes Scattering Analysis.

The authors present a model for estimating the drop size distribution on a radome surface based on skin surface material, area, inclination, and rainfall rate.

Then, a multilayer radome model based on the transmission-line-equivalent circuit model is used to characterize the radome’s scattering parameters. We present a systematic characterization of dielectric permittivity of 6 commonly used, low-loss polymers namely polystyrene, parylene, polyimide, SLA resin, SU-8, and SUEX for the GHz to 2-THz bands using transmission mode time domain spectroscopy.

The dielectric constant and loss tangent for each polymer was sys. Antennas for Communications (AFC) high technology radome capability combines the expertise of materials science, geodesic domes, prefabricated structures and electromagnetics.

AFC manufactures six types of dielectric radomes. The six types identify themselves primarily by the radome wall construction. In each case, the dielectric panel edges are reinforced into flanges for adjacent panel. They ar coated on the outside with dielectric slabs of dielectric constant 1 and 3.

It is shown that such a configuration can be disigned to yield a transmission curve with band-pass characteristics, i.e., yielding essentially unity transmission coefficient over a certain frequency range (narrow band) for angles of incidence up to as high as require measurements and simulations to develop self-consistent models of transmission lines and distributed elements.

Transmission Line Theory Regardless of the actual structure, a segment of uniform transmission line (i.e., a transmission line with constant crosssection along its length) can be modeled by the circuit shown in Figure (b). This book reports on a new radome wall configuration based on an inhomogeneous planar layer, which overcomes current fabrication constraints in radome design and yields improved electromagnetic (EM) characteristics.

The book also includes a detailed description of radomes and antenna-radome interaction studies for different radome wall.radar transmission. Slip-cast fused silica has the lowest dielectric constant of all the materials under consider­ ation and thus has less stringent wall tolerances.

The melt limit for SCFS was chosen as K, the temperature at which radar transmission begins to deteriorate as the material softens.The transmission characteristics of the radome change with the wave incidence angle and polarization.

Electric fields that are parallel to the plane of incidence have much higher transmission than fields that are perpendicular to the plane of incidence. Aerodynamic radomes used on aircraft and missiles often see high incidence angles.