Publication:
Widebanding techniques for VHF antennas - I

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Authors
Janaswamy, Ramakrishna
Subjects
Advisors
Date of Issue
1992-09
Date
1992-09
Publisher
Monterey, CA; Naval Postgraduate School
Language
en_US
Abstract
A straight wire antenna of fixed length is narrow band due to the rapid variations in its input impedance, and to a lesser degree, in its radiation pattern. A wire antenna is, however, lightweight, easy to fabricate and simple to mount on any platform. To make a wire antenna broadband, we need resistive and/or reactive loading along its length. In this report, we consider monopole antennas loaded with (a) modified Wu-King resistivity profile, and (b) complex lumped loads. A 1-m monopole antenna is considered over 30-90 MHz. Input impedance and radiation efficiency data for the two cases are generated by employing the moment method. Tuning networks are designed using the real frequency method of Carlin to maximize the power transfer from a 50 ohm source to the antenna. Overall performance of the antenna by taking into account the mismatch loss due to the tuning network and resistive loss due to the loading is studied
Type
Technical Report
Description
Series/Report No
Department
Electrical and Computer Engineering
Identifiers
NPS Report Number
NPS-EC-92-010
Sponsors
U.S. Army Communications and Electronics Command.
Funder
U.S. Army Communications and Electronics Command.
Format
33 p. : ill. ; 28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
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