2 edition of The helicopter antenna radiation prediction code (HARP) found in the catalog.
The helicopter antenna radiation prediction code (HARP)
by Ohio State University, ElectroScience Laboratory, National Aeronautics and Space Administration, Langley Research Center, For sale by the National Technical Information Service in Columbus, Ohio, Hampton, VA, [Springfield, VA
Written in English
|Statement||F.T. Klevenow ... [et al.].|
|Series||NASA CR -- 186925., NASA contractor report -- NASA CR-186925.|
|Contributions||Klevenow, F. T., Langley Research Center.|
|The Physical Object|
In the field of antenna design the term radiation pattern (or antenna pattern or far-field pattern) refers to the directional (angular) dependence of the strength of the radio waves from the antenna or other source.. Particularly in the fields of fiber optics, lasers, and integrated optics, the term radiation pattern may also be used as a synonym for the near-field pattern or Fresnel pattern. Antenna Downtilt and Coverage Calculator Pasternack The Antenna Downtilt and Coverage Calculator (aka Antenna Tilt Angle Calculator) is used to determine the approximate downward angle, measured in degrees, which the transmitting antenna is to be positioned for optimal signal strength and coverage. It also provides, given a beamwidth, the inner and outer radii of beam's .
Search the world's most comprehensive index of full-text books. My library. Introduction. SPLAT! is an RF Signal Propagation, Loss, And Terrain analysis tool for the electromagnetic spectrum between 20 MHz and 20 GHz. Applications of SPLAT! include site engineering, wireless network design, amateur radio communications, frequency coordination, communication system design, and terrestrial analog and digital television and radio broadcasting.
E.H. Newman, R.G. Rojas and H. Shamansky, "Helicopter Antenna radiation prediction," NASA Langley, March R.G. Rojas, " Modeling of L-band Antennas and CDTI Equipped Aircraft for ADS-B Applications on General Aviation Aircraft," Technical Report , September (FAA). The SA COMM antenna is designed for installation in aircraft with larger vertical tails such as the Lancair IV, Glasair, Express and the many versions of Ex’s. This dipole antenna is a full half wavelength which provides the maximum aperture at this frequency. This antenna .
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Referred to as the Helicopter Antenna Radiation Prediction Code (HARP), and will be run via an X windows menu driven user interface on a Tektronics. 3D Graphics Workstation. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.
Operation of the helicopter antenna radiation prediction code. Article (PDF Available) July The Helicopter Antenna Radiation Prediction Code (HARP) By J. Scheick, E. Newman, H. Shamansky, B. Lynch, F. Klevenow, K. Sze and R. Rojas. Abstract. The first nine months effort in the development of a user oriented computer code, referred to as the HARP code, for analyzing the radiation from helicopter antennas is.
The first nine months effort in the development of a user oriented computer code, referred to as the HARP code, for analyzing the radiation from helicopter antennas is described. The HARP code uses modern computer graphics to aid in the description and display of the helicopter geometry.
At low frequencies the helicopter is modeled by polygonal plates, and the method of moments is used to Author: F. Klevenow, B. Lynch, E. Newman, R. Rojas, J. Scheick, H. Shamansky, K. Sze. Operation of the helicopter antenna radiation prediction code. By K. Sampath, H. Shamansky, E.
Braeden, J. Scheik, F. Klevenow, R. Rojas and E. Newman. Abstract. HARP is a front end as well as a back end for the AMC and NEWAIR computer codes. These codes use the Method of Moments (MM) and the Uniform Geometrical Theory of.
Disclosed is a combined antenna and helicopter rotor blade. The antenna has one or more electrically non-conductive rotor blades, each having an electrical conductor positioned parallel to the major axis of a respective rotor blade.
An electrical connection is provided to connect the antenna to a radio for the reception or transmission of radio waves. This paper investigates the effect of rotor-blade rotation on the radiation characteristics of a ft. high-frequency (HF) antenna mounted on a scaled helicopter model.
Specifically, a quasi-stationary approach suggested by Van Bladel () is used in conjunction with a full-wave method of moments code (NEC) to examine rotor modulation on the.
The radiation resistance is the equivalent resistance that would dissipate the power the antenna radiates, with a current flowing in it equal to the antenna current at a current loop (maximum).
The loss resistance of a half-wave antenna is ordinarily small, compared with the radiation resistance, and can usually be neglected for practical purposes.
Contents Introduction to the Fourth Edition ix 1 Introduction to Radio Broadcasting and Communications 1 2 Radio-wave Propagation 5 3 Transmission Lines 59 4 The Smith Chart 95 5 Fundamentals of Radio Antennas 6 High-Frequency Dipole and Other Doublet Antennas 7 Vertically Polarized HF Antennas 8 Multiband and Tunable-Wire Antennas 9 Longwire Directional Antennas /TACAMO .
Subsequently the HF antenna coupling modes on the EC were analyzed using NEC4 . More recently, the Canadian DND C/Hercules was modernized to include the dorsal notch antenna shown in Figure 1b). A wire segment model was used to analyze the performance of this antenna  with NEC4. The wire-grid model is.
REPORT DOCUMENTATION 1. REPORT NO. PAGE 4. Title and Subtitle 2. Reciplent's Accession No. Report Date June Operation of the Helicopter Antenna Radiation Prediction Code 6.
Measuring Antenna Radiation Patterns Antenna is rotated in an Anechoic Chamber to measure radiation pattern Radiation pattern of any antenna Is the shape of the Electro-magnetic field radiated or Received by the antenna Dipole Antenna One of the most widely used antenna types is the half-wave dipole.
The half-wave dipole, also called a doublet, is. In addition, the prediction of antenna coupling involves near-field calculations that need extra care during the computation process. We discuss geometry modeling guidelines for complex structures. Using these rules, model two HF antennas mounted on an Apache helicopter airframe.
Radiation pattern •The radiation pattern of antenna is a representation (pictorial or mathematical) of the distribution of the power out-flowing (radiated) from the antenna (in the case of transmitting antenna), or inflowing (received) to the antenna (in the case of receiving antenna) as a function of direction angles from the antenna.
The Helicopter Antenna Radiation Prediction Code (HARP) NTRS Full-Text: Click to View [PDF Size: MB] Author and Affiliation: Klevenow, F. In the ray-traced image of our BRL-CAD computer model of the Blackhawk helicopter, a whip antenna mounted near the top of the vertical stabilizer is visible.
The rotor modulated (with both the main and tail rotors) radiation pattern of this antenna was predicted using ASU's FDTD-based NEWS code, and is compared with the full-scale measurement. Besides antenna measurements performed on helicopter models, one of the major efforts of the AHE group is numerical prediction of antenna radiation patterns, input impedance, efficiency and gain.
This process involves numerical simulations of the individual antenna elements in the absence of the helicopter as well as in the presence of the.
T1 - Coupling prediction of HF antennas mounted on helicopter structures using the NEC code. AU - Peng, Jian. AU - Balanis, Constantine.
PY - Y1 - N2 - The moment-method-based NEC code is widely known and widely used low frequency code. Tokgoz and C. Reddy, "uCAST - A new generation UTD code for radiation pattern predictions of antennas on aircraft models," Antenna Applications Symp., Monticello, IL, Sep.
The antenna considered is an experimental 14 inches 'towel bar' used in the MHz band. A companion 24 inches HF antenna is mounted on the opposite side of the helicopter tail boom.
Finally, the FDTD predictions are found to compare well with experimental results from an operational Apache helicopter and with measured data obtained using an.Related Recent Books About New materials developed More than papers have been published About patents filed in related technologies ‘Dielectric Resonator Antenna’ (Eds.
Kishk & Antar), Antenna Engg. Handbook (Ed. Volakis), McGraw Hill, Dielectric Resonator Antennas, Eds. Luk & Leung, Res. Studies, Radiation emitted from an antenna which is more intense in a particular direction, indicates the maximum intensity of that antenna.
The emission of radiation to a maximum possible extent is nothing but the radiation intensity. Mathematical Expression.
Radiation Intensity is obtained by multiplying the power radiated with the square of the.