NDLI: A novel antenna for mobile radio relay operation in the UHF range

Content Provider	IEEE Xplore Digital Library
Author	Triolo, F.
Copyright Year	1966
Description	Author affiliation: U.S. Army Signal Engineering Laboratories, Fort Monmouth, NJ, USA (Triolo, F.)
Abstract	A novel type antenna configuration called the "Double-Rhombic" has been designed and constructed for use with mobile radio relay systems operating in the frequency range from 400 to 600 mc. This configuration is formed by combining two rhombs whose planes form an angle with each other and which have a common diagonal. The input and output terminals of both rhombs are connected in parallel with each other. A 60 degree angle between planes was found to be optimum on the basis of full scale radiation pattern measurements. By proper choice of diameter and taper of the antenna conductors the input and terminating impedances were finally adjusted to a nominal 300 ohms. A 50 to 300 ohm compensated bifilar coil balun transformer was designed to transform from a 50 ohm coaxial input to the balanced antenna input. At the terminating end a similar balun was utilized in reverse to match to a 50 ohm, 5 watt coaxial termination. The antenna is capable of handling approximately 100 watts of power. Its gain compared to the standard Radio Relay Set AN/TRC-24 Band "D" dipole array varies from -2.0 to +2.5 db over the frequency band. The SWR was found to be less than 1.4 to 1. The antenna is so mechanically designed that it is relatively light, in view of its fairly large dimensions, being in the order of 25 lbs. It is constructed of thin-walled aluminum tubing and employs "girder-type" support in its fabrication. It has a very low wind drag when compared to other antennas utilized in the same range. The antenna is also capable of being assembled and disassembled in a very short time and therefore is very attractive for use in military applications for mobile radio relay operation in the UHF frequency range.
Starting Page	183
Ending Page	192
File Size	866791
Page Count	10
File Format	PDF
DOI	10.1109/IRECON.1958.1150691
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1966-03-21
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Antenna measurements Dipole antennas Impedance matching Mobile antennas UHF antennas Frequency Coaxial components Relays Land mobile radio Antenna radiation patterns
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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