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Antenna Array

 
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chandan.pradhan14
Antenna-Theory.com Newbie


Joined: 10 Apr 2014
Posts: 1

PostPosted: Thu Apr 10, 2014 9:35 am    Post subject: Antenna Array Reply with quote

Do radiation beam using antenna array could make a 360 degree scan??
And can antenna array be used in BS of cellular network to track the mobile user?
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Schubert
Antenna Wizard


Joined: 08 Apr 2009
Posts: 161

PostPosted: Fri Apr 11, 2014 9:35 pm    Post subject: Reply with quote

Yes it is possible to do 360 scan. You can adjust the weights of the antenna array for maximum reception towards any specific angle. This will require a 2-dimensional array though.

It is also possible for a base station to track a mobile user. However, base stations tend to have broad beam widths for maximum coverage, so there would need to be a major overhaul to the infrastructure (more antennas, tighter beam width antennas, and a lot more processing).
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waleed123
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Joined: 11 Oct 2014
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PostPosted: Sat Oct 11, 2014 9:28 am    Post subject: Reply with quote

here are a few ways depending on what type of antenna it is.

If you have a simple half-wavelength dipole antenna, you can assume a resistor of 70 Ohms and some inductance (impedance is about 73 + j43 ohms) depending on the frequency.

If you have a complicated antenna, you can measure it on a Vector Network Analyzer (VNA) to get the impedance and then make a simple circuit.

Generally you will have some resistance (for radiation resistance + loss resistance) and either some capacitance or inductance in series.
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EA1DDO
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Joined: 06 Nov 2014
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PostPosted: Thu Nov 06, 2014 10:59 am    Post subject: Reply with quote

Hi Chandan,

Yes, that is called "Smart Antenna" system.



There are several ways to implement that. Please have a look at next link:

http://robotification.com/2007/06/15/smart-antennas/



http://www.ijser.org/paper/An-Intelligent-Approach-for-Dense-Urban-Area-in-existing-2G-2-5G.html

I am not sure if this system is already in use. May be some where, not everywhere.

Regards, Maximo
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