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  1. IRE Transactions on Antennas and Propagation
  2. Year : 1955 Volume : 3
  3. Issue 3
  4. Folded unipole antennas
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Year : 1962 Volume : 10
Year : 1961 Volume : 9
Year : 1960 Volume : 8
Year : 1959 Volume : 7
Year : 1958 Volume : 6
Year : 1957 Volume : 5
Year : 1956 Volume : 4
Year : 1955 Volume : 3
Issue 4
Issue 3
Proceedings or transactions?
News and views
Back-scatter from perfectly-conducting doubly-trochoidal and doubly-sinusoidal surfaces
On nonuniform dielectric media
A dual-standard for radar echo measurements
Folded unipole antennas
Characteristics of tropospheric scattered fields
Use of folded monopoles in antenna arrays
A new interpretation of the integral equation formulation of cylindrical antennas
The radiation field produced by a slot in a large circular cylinder
Fresnel antenna patterns
Parasitic arrays excited by surface waves
Troposheric refraction near Hawaii
Effect of arbitrary phase errors on the gain and beamwidth characteristics of radiation pattern
Issue 2

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Folded unipole antennas

Content Provider IEEE Xplore Digital Library
Author Leonhard, J. Mattuck, R. Pote, A.
Copyright Year 1955
Abstract Folded unipole antennas less than a quarter wavelength long are used to transform the input resistance of short vertical antennas to a more acceptable value by effecting a transformation within the antenna itself. An equivalent circuit of the folded unipole is derived. The transformation of input impedance is shown to be due to two factors: (1) the division of radiation mode currents between the driven and undriven portions of the antenna, and (2) the flow of currents in a nonradiating transmission-line mode. The effect on the input impedance of reactive elements inserted between the unfed portion and ground is investigated. The theory is verified with an experimental antenna whose input impedance is measured as a function of tuning reactance. The experimental curve is found to be in good agreement with the theory. Two methods of operating the folded unipole are proposed. In the first, only the division of radiation mode currents is utilized to effect the input impedance transformation. This method is applicable to antennas close to a quarter wave. The second method transforms the input impedance by utilizing the transmission-line mode only. It is applicable to short antennas.
Starting Page 111
Ending Page 116
Page Count 6
File Size 553936
File Format PDF
ISSN 00961973
Volume Number 3
Issue Number 3
Language English
Publisher Date 1955-07-01
Access Restriction Subscribed
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword Dipole antennas Transmission lines Electric resistance Equivalent circuits Transmitting antennas Antenna theory Antenna measurements Impedance measurement Broadcasting Conductors
Content Type Text
Resource Type Article
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