STUDY PROGRAM RELATED TO SHIPBOARD ANTENNA SYSTEM ENVIRONMENT.
Interim rept., 7 Sep 62-3 May 63.
OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS ANTENNA LAB
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Presented are investigations completed to date to obtain a more precise understanding of shipboard radio interference and communication problems and to devise methods and techniques for alleviating them. The presentation is divided into three areas, namely. 1 array studies, 2 circuits for reduction of interchannel interference, and 3 field methods for antenna decoupling. The first area involves research into antenna types, particularly arrays, which are adaptable to shipboard use that is, antenna arrays which exhibit enhanced directivity in spite of the close confines of a vessel and which can be conveniently scanned or made to lock onto an incoming source despite ship and sea motions. Also included under this heading is the design of arrays of elements which are minimally coupled to one another in order to aid the operation in separate information channels or to provide the optimum gain for the arrays. The second area mentioned involves reduction of the r.f. interference between two closely spaced antennas and their associated communications channels by circuits located between the antenna and its receiver, i.e., passive or active filtering. Author