Accession Number : AD0464376


Title :   STUDY PROGRAM RELATED TO SHIPBOARD ANTENNA SYSTEM ENVIRONMENT


Descriptive Note : Final rept. 7 Sep 1962-6 Sep 1963


Corporate Author : OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS ANTENNA LAB


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/464376.pdf


Report Date : 06 Sep 1963


Pagination or Media Count : 53


Abstract : Efforts concerned a study of the problems of shipboard radio interference and its reduction by antenna techniques. A serious shipboard problem is that of receiving weak signals while near-by antennas aboard the same vessel are transmitting at high power levels and coupling interference into the receiving system. One research approach to alleviate this situation has been directed toward examining antennas which would be inherently decoupled, such as traveling-wave antennas. A second approach has been to find an analytical formulation for the shipboard coupling problem from field theory. A third approach has been the introduction of a nulling signal to cancel the interference signal. Three decoupling techniques were investigated - covering the spectrum from the interior, confined type to the exterior, diffuse type. On the one extreme, a servo-controlled nulling loop system was devised and a prototype constructed. At the other extreme is the normal mode approach which views the entire ship and its environment as a network supporting modes which are orthogonal to one another.


Descriptors :   *PHASED ARRAYS , *RADIO INTERFERENCE , *COUPLED ANTENNAS , *HELICAL ANTENNAS , *SPIRAL ANTENNAS , *SHIP ANTENNAS , RADIOFREQUENCY INTERFERENCE , SERVOMECHANISMS , ANTENNA FEEDS , FIELD THEORY , MEDIUM FREQUENCY , CONICAL ANTENNAS , ANTENNA RADIATION PATTERNS , ANTENNAS , GAIN , REDUCTION , SEMICONDUCTOR DIODES , HIGH FREQUENCY , ELECTRONIC SCANNERS


Subject Categories : Electrical and Electronic Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE