Introduction Literature Survey Objective Technique Methodology Simulation in Matlab Application Reference

1. Enhancement in phased
array antenna
NAME : ASHISH S. PATIL
M.E.1ST YR (MICROWAVE)
ROLL NO. :14MV009
GUIDE NAME : PROF. S.P.BHOSALE

2. PRESENTATION FLOW
 Introduction
 Literature Survey
 Objective
 Technique
 Methodology
 Simulation in Matlab
 Application
 Reference
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3. Introduction
 What is antenna array ?
 What is Phased antenna array ?
directive antenna made with individual
radiating sources
shape and direction of pattern is determined by relative
phases amplitudes applied to each radiating element.
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5. Introduction
Phased array principle :
1. Time delay :
2.Sinusoidal wave:
3.Delay compensation:
4.Array factor :
5.Scan angle :
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6. Literature Survey :
 Marconi’s paper entitled “Directive Antenna” in 1906
 A multiple unit steerable antenna was developed
in 1937 by Friis and Feldman for short wave
reception
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7.  The Sea based X-band radar is a combination of the
world’s largest phased array radar carried aboard a
mobile, ocean going semi-submersible platform
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8. Objective :
 Power dividing and phase shifting tasks are performed
using the same circuitry.
 Less phase shift from phase shifters compared to any of
the conventional designs of phased arrays.
 Configurations for enhancing size and radiation properties
of phased array systems.
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9. Technique :
 Phased Array Based on Extended
Resonance Technique
 Bi-Directional Series-Fed Phased Array
 Phased array using staggered array configuration
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10. Methodology :
 Phased Array Based on Extended Resonance Technique
 Conventional design
of phased array
 Extended resonance
Phased array
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11.  Phased Array Based on Extended Resonance Technique
The general structure of an extended resonance network
 Phased difference
between adjacent
node is given by
 Series admittance
 Phase of the output ports control by the value of Yn.
 Series reactance Xn also be tuned simultaneously to
maintain the equal power division. 11AISSMS COE,PUNE

12.  The extended resonance circuit using just varactors as shunt
susceptance
The phase shift when the varactors are tuned is:
The maximum achievable phase shift when Y1 is tuned :
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13.  Maximum achievable inter-element phase shift versus the shunt
inductance for various varactors at 2 GHz
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14.  Bi-Directional Series-Fed Phased Array
• Array beam can be controlled by a single bias voltage.
• Identical couplers and switches required. 14AISSMS COE,PUNE

15. To reduces the required amount of phase shifting :
 Placing the phase shifters in series rather than in parallel.
 arrays can be bi-directionally fed.
1] 2]
3]
4]
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16.  Phased array using staggered array configuration
 Two staggered array configurations are used to
enhancing size and radiation properties phased array
systems.
1. Rotating each element 45 degree
2. Inserting additional rows in the middle which are
shifted by half the distance between elements.
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17. 2] staggered configuration 1
3] staggered configuration 2
1] Regular configuration
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18. fig.1 fig.2 fig.3
fig.1 fig.2 fig.3
Radiation along broadside direction :
Radiation along 30 degree steering angle :
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19.  Simulation on MATLAB
=N = 20; % Number of elements
=D = 0.5; % Element spacing (m)
=ha = phased.ULA(N,D);
=ViewArray(ha,'Title','Uniform Linear
Array (ULA)')
set(gca,'CameraViewAngle',4.4);
=N = 24; % Number of elements
= R = 1; % Radius (m)
=azang = (0:N-1)*360/N-180;
=ha = phased.ConformalArray(...
'ElementPosition',[R*cosd(azang);
R*sind(azang);zeros(1,N)],...
ElementNormal', [azang;zeros(1,N)]);
= viewArray(ha,'ShowNormals',true,
'Title','Uniform Circular Array (UCA)')
view(0,90)
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20.  Application
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21.  Application
 On Applications of Self-Phased Array Antennas to
Mobile Communications.
 Advances in Phased Array Systems for Radio
Astronomy
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22.  REFEREANCE
[1] Abdelnasser A. Eldek , “Enhancement of phased array size and radiation
properties using staggered array configuration ”, IEEE Trans.Vol. 39,2013
[2] Danial Ehyaie , “Novel Approaches to the Design of Phased Array Antennas”
Prentice-hall,Inc,2011
[3] Stefan J. Wijnholds, Wim A. van Cappellen and Jan Geralt bij de Vaate ,
“Advances in Phased Array Systems for Radio Astronomy” , IEEE Trans,
Vol . 59,2013
[4] S.L.Karode, “Self-phasing antenna array techniques for mobile communications
applications ”,IEEE Trans, Dec 2000
[5] Ali Tombak and Amir Mortazawi, “Novel Low-Cost Beam-Steering Technique
Based on the Extended-Resonance Power-Dividing Method ”, IEEE Trans,
vol.52,no.2,Feb 2004
[6] Danial Ehyaie , “A 24-GHz Modular Transmit Phased Array”,IEEE vol.59,
no.6,June 2011
[7]www.mathworks.com/R2015/phased antenna array toolbox.html
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