Coupling losses in multiple beam antennas.

94 Pages·0.94 MB·en_US

by  Tucker, Randall Jay.;Jenn, David C.

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11 TITLE(IncludeSecurityClassification)
COUPLINGLOSSESINMULTIPLEBEAMANTENNAS
12 PERSONALAUTHOR(S) RandallJTucker
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Master'sThesis From To September 1992 87
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17.COSATICODES 18 SUBJECTTERMS(continueonreverseifnecessaryandidentifybyblocknumber)
FIELD GROUP SUBGROUP MultipleBeamAntennas,CouplingLosses,ArrayAntennas,MultipleBeamArrays
19 ABSTRACT(continueonreverseifnecessaryandidentifybyblocknumber)
Therelationship betweenbeamcouplinglossesinmultiplebeamantennasandpatternparameterssuchas
beamwidthandsidelobelevelisinvestigated.Acomputeralgonthimtocalculatethecouplingcoefficientsfor
arbitrarynumberofbeams isimplementedusingMATLAB.Gain-lossdataforvariousarrayamplitudedistributions
ispresented.
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Coupling Losses
in
Multiple Beam Antennas
by
Randall Jay Tucker
Lieutenant, United States Naval Reserve
B.S., University of North Carolina-Asheville
Submitted in partial fulfillment
of the requirements for the degree of
MASTER OF SCIENCE IN ELECTRICAL ENGINEERING
from the
NAVAL POSTGRADUATE SCHOOL
September 1992
ABSTRACT
The relationship between beam coupling losses in multiple beam antennas and
pattern parameters such as beamwidth and sidelobe level is investigated. A computer
algorithm to calculate the coupling coefficients for arbitrary number of beams is
implemented using MATLAB. Gain-loss data for various array amplitude distributions
is presented.
in
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TABLE OF CONTENTS
INTRODUCTION
I.
MOTIVATION
A.
PROBLEM STATEMENT
B.
APPROACH
C.
CHAPTER OVERVIEW
D.
ARRAY FUNDAMENTALS
H. 8
m. MATHEMATICAL FORMULATION OF BEAM COUPLING 21
INTRODUCTION
A. 21
B. SCATTERING MATRIX FOR N-PORT NETWORKS 21
C. BEAM COUPLING FACTORS 24
D. SPECIALIZATION TO AN ARRAY 26
COUPLING COEFFICIENTS 26
1.
2. RADIATION EFFICIENCY AND COUPLING LOSS 27
DATA SUMMARY
IV. 31
A. INTRODUCTION 31
IV
BEAM DATA
B. 2 33
BEAM DATA
C. 4 33
D. MULTIPLE BEAMS AND GAIN LOSS 37
E. BEAM COUPLING LOSSES VS. NUMBER OF BEAMS 39
V. CONCLUSIONS 42
APPENDLX A - CALCULATED DATA 44
BEAM DATA
A. 2 44
BEAM DATA
B. 4 56
APPENDIX B. 4 BEAM RADIATION EFFICIENCY 68
APPENDIX C. COMPUTER SOURCE CODE 70
A. INTRODUCTION 70
MATLAB SOURCE CODE
B. 71
COSINE ON A PEDESTAL AMPLITUDE WEIGHTS
1. 71
TAYLOR AMPLITUDE WEIGHTS
2. 71
3. BEAM COUPLING LOSS CALCULATOR 72
4. ARRAY PATTERN FUNCTION 73
LIST OF REFERENCES 75
INITIAL DISTRIBUTION LIST 76
VI