Islamic University-Gaza Faculty of Engineering Electrical and Computer Engineering Antenna Theory PRESENTATION Semi Smart Antenna using phased dipole array Prepared by: Shadi Y. El-Tanani ( 120041525 ) Ali M. Al-Saqqa ( 120040246 ) Instructor: Dr. Mohammad Ouda
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Islamic University-GazaFaculty of Engineering
Electrical and Computer Engineering
Antenna Theory
PRESENTATIONSemi Smart Antenna using phased dipole
array
Prepared by:
Shadi Y. El-Tanani ( 120041525 )Ali M. Al-Saqqa ( 120040246 )
Instructor:
Dr. Mohammad Ouda
Agenda• Introduction.• Main Idea.• Switching.• Design outline.• Simulations.
Using Matlab Using NEC-Win+ Using PCAAD 5.0
• Final Specification. Using Power Tools
• Conclusion.
Introduction
Semi smart antennas divides the plane into several sectors .
Main Idea
Usually , the Transmission antenna radiation covers all the intended area (cell).
In Semi-Smart systems , an additional antenna array is utilized , it will cover only one sector at a time ,which has the most traffic.
Cont’d
Our application is a transmission tower for cellular systems.
F= 916 ~ 960 MHz we choosed : f= 920MHz
Design Outline
The basic antenna is a an array of 3 dipoles.
Amplitude : λ/2Spacing : λ/4Phase : 0
Cont’d
The semi smart antenna is a scanning The semi smart antenna is a scanning endfire array using 10 elements.endfire array using 10 elements.Amplitude : Amplitude : λλ/2 , Spacing : /2 , Spacing : λλ/4 , Phase /4 , Phase : : ββ
Example :Example :There is a high traffic at sector 3.There is a high traffic at sector 3.sector 3 starts from 45º to 67.5º . sector 3 starts from 45º to 67.5º . Choose Choose θθ=60º ,hence =60º ,hence ββ= -Kd cos = -Kd cos θθ = - = -ππ/4/4
Switching
The switching circuit is based on HPDL-100A
Specifications :Step Size : 10 psMax. Delay Range: 10.23 ns -3.0 dB point @ min. delay1.26 GHz -3.0 dB point @ max. delay665.0 MHz
Central Base Station
SimulationsUsing MatlabSimulating the semi smart antenna
lamda=input('enter the value of wave length= ');N=input('enter the no. of elements= ');beta=input('enter your progressive phase= ');d=input('enter the seperation distance = ');k=(2*pi/lamda);theta= pi/100:pi/100:2*pi;w=beta+k*d.*cos(theta);AF=sinc(N*(w./2))./sinc(w./2);subplot(2,3,3);polar(theta,AF)