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Title: WIRE-GRID MODELING OF SLOT ANTENNAS
Abstract: The ability of a computer code to model slot antennas is investigated. A comparison of experimental and numerically calculated antenna data is presented. [Vol. 1, No. 1, pp.6-14 (1986)]
Author(s): Jimmy L. Funke
File Type: Journal Paper
Issue:Volume: 1      Number: 1      Year: 1986
Download Link:Click here to download PDF     File Size: 1140 KB

Title: FOUR-ELEMENT BEVERAGE ARRAY
Abstract: An experimental four-element high-frequency Beverage antenna array has been devised for tests on medium range and long range ionospheric circuits. The radiation pattern of the experimental array was calculated using Numerical Electromagnetics Code (NEC) and found to be skewed in azimuth. The antenna installation was subsequently modified in accordance with NEC predictions and the desired beam direction was obtained. Measurements confirmed that the NEC predictions were valid. [Vol. 1, No. 1, pp. 15-20 (1986)]
Author(s): D. V. Campbell, P. Cunningham, P. Dubowicz, K. Loffer
File Type: Journal Paper
Issue:Volume: 1      Number: 1      Year: 1986
Download Link:Click here to download PDF     File Size: 368 KB

Title: MININEC APPLICATIONS GUIDE
Abstract: The Mini-Numerical Electromagnetics Code -- MININEC has become very popular among amateur and professional antenna practitioners. Its widespread acceptance is due in no small part to its great versatility, user friendliness and extreme compactness which permits installation on PC's. Prior to MININEC, serious numerical modeling of antennas had to be accomplished primarily on mainframe computers. With MININEC, it is now possible to solve complex wire antenna problems in a conversational mode on a modest desk top computer, for example a PC having 64K of RAM. The present paper is concerned with application guidelines for MININEC. The input data set is discussed and numerical results are interpreted. A variety of illustrative linear antenna problems are worked out. [Vol. 1, No. 1, pp. 21-28 (1986)]
Author(s): D. V. Campbell
File Type: Journal Paper
Issue:Volume: 1      Number: 1      Year: 1986
Download Link:Click here to download PDF     File Size: 627 KB

Title: MODIFICATION TO MININEC FOR THE ANALYSIS OF WIRE ANTENNAS WITH SMALL RADIUS TO WAVELENGTH RATIO
Abstract: MININEC is a useful and compact method of moments antenna program, but MININEC does not give reasonable values for the input reactance of very thin wires at low frequencies. This problem greatly restricts the use of MININEC in the design and analysis of VLF and LF antennas. A modification to the program which eliminates this restriction is discussed. The modification consists of treating both the source and observation segments as filaments and only considering the wire radius when computing the self-impedance. A listing of the changed computer code is included. [Vol. 1, No. 1, pp. 29-31 (1986)]
Author(s): Todd D. Poston, Stephen W. Kershner
File Type: Journal Paper
Issue:Volume: 1      Number: 1      Year: 1986
Download Link:Click here to download PDF     File Size: 367 KB

Title: DREDGING-DEPOSITION, A TWO LAYER GROUND PROBLEM IN MF-RADIO WAVE PROPAGATION
Abstract: A limited area in close proximity to an MF broadcasting station was foreseen for deposition of dredging material. The influence that the lossy material with finite height might have on MF propagation was studied. [Vol. 1, No. 1, 32-39 (1986)]
Author(s): W. Tippe
File Type: Journal Paper
Issue:Volume: 1      Number: 1      Year: 1986
Download Link:Click here to download PDF     File Size: 618 KB

Title: Broadcast Antenna Optimization with Microcomputer
Abstract: Increasingly intense competition for the limited frequency allocations in the AM broadcast band (500-1600 kHz) has led to the use of directional array antennas to reduce interference. In this band, all available channels to reduce interference. In this band, all available channels have been assigned, and for a new station to receive a frequency assignment they must guarantee no interference with existing stations. Thus, new stations must be located a significant distance away from any existing station on that frequency, and often additional protection must be provided by using directional array antennas. In the U.S., more than 25% of the AM broadcast antennas are directional arrays. This allows considerably more use of each channel and is perhaps the first attempt at practical "frequency reuse" [1].
Author(s): P. M. Hansen, J. W. Rockway
File Type: Journal Paper
Issue:Volume: 1      Number: 1      Year: 1986
Download Link:Click here to download PDF     File Size: 312 KB

Title: Modeling Monopoles on Radial-Wire Ground Screens
Abstract:
Author(s): Gerald J. Burke
File Type: Journal Paper
Issue:Volume: 1      Number: 1      Year: 1986
Download Link:Click here to download PDF     File Size: 253 KB