An Automatic Antenna -Tuning Unit

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Abstract:

An antenna-tuning system has been designed to match automatically the input impedance of a 35-foot whip antenna to a 50-ohm coaxial transmission line over the frequency range of 2 to 18 Mc. This unit has been designed specifically to operate with a Naval Communications Transmitter, type TCK (400-watt output), but the design is such that it is applicable to a wide variety of automatic impedance-matching problems with only minor variations. A satisfactory solution to the technical problems peculiar to such a system has been attained. Detailed consideration was limited to those components designed especially to fill the requirements of this problem. It is concluded that the principal limitations of the range of application of this system are of a physical nature, such as the maximum tuning ranges and voltage ratings available in continuously variable capacitors and inductors. On the basis of the work done to date it is concluded that, if the calculated ranges and voltage ratings of the components of the cantilever network can be mechanically realized, the completed unit will match a standard 35-foot whip antenna to a 50-ohm coaxial line with a resulting standing-wave ratio of not more than 1.1 at any frequency between 2 and 18 Mc. It is further concluded that comparable results will be obtainable in a wide variety of applications with relatively minor modifications of the original model and that the principal limitations on the range of applications are of a physical nature, such as the tuning ranges available in capacitors and inductances, voltage ratings obtainable with maximum tuning range, and other factors of a similar nature.

Author(s):
Author Organization(s):
NAVAL RESEARCH LAB WASHINGTON DC
Funding Organization(s):
NAVAL RESEARCH LAB WASHINGTON DC, WASHINGTON, DC
Document Type:
Technical Report/Interim Report
Publication Date:
1950 Nov 02
Pagination:
18

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution Code:
A - Approved For Public Release
Distribution Statement: Public Release.
Copyright: Not Copyrighted

RECORD

Collection: TRECMS
Subject Terms
Descriptor(s):
standing wave ratios, standing waves, automatic, electromagnetic fields, frequency, impedance, mathematical analysis, military research, resistance, transmission lines, voltage dividers, whip antennas, capacitance, capacitors, detectors, equations, impedance bridges
Keyword(s):
Automatic Antenna, Tuning Unit, cantilever network, voltage ratings
Subject Categories:
Electrotechnology and Fluidics; Physics; Physics
Modernization Areas:
Microelectronics
Communities of Interest:
;
Descriptor(s):
standing wave ratios, standing waves, frequency, impedance, resistance, transmission lines, whip antennas, capacitance, capacitors, detectors, equations, mathematical analysis, waves, circuit analysis, circuits, flight decks, inductance
Creation Date:
2023 Nov 17
Update Date:
2023 Nov 28