What equation can I use to find the interference level (quantitative) between two transmitting antennas with overlap?

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• 
  Jagadeesh Babu · St. Ann's Group of Institutions

  The interference between antennas can be analysed by using the parameter - MUTUAL COUPLING which is nothing but S21. Another parameter known as correlation coefficient can also be used which is given by the equation mentioned in Page No. 109 of following reference.. K. Jagadeesh Babu, K.Sri Rama Krishna and L. P. Reddy, "A Multi Slot Patch Antenna for 4G MIMO Communications," International Journal of Future Generation Communication and Networking, vol. 4, pp. 105-112, 2011.

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  The interference between antennas can be analysed by using the parameter - MUTUAL COUPLING which is nothing but S21.
  Another parameter known as correlation coefficient can also be used which is given by the equation mentioned in Page No. 109 of following reference..
  K. Jagadeesh Babu, K.Sri Rama Krishna and L. P. Reddy, "A Multi Slot Patch Antenna for 4G MIMO Communications," International Journal of Future Generation Communication and Networking, vol. 4,
  pp. 105-112, 2011.

  Jul 23, 2012
• 
  L. Luini · Politecnico di Milano

  Hello Caroline, what is the carrier frequency you are referring to? Interference may be accounted for just by considering the standard link budget equation between the transmitter and the receiver that is gathering unwanted power from the transmitter. If you are dealing with GSM/UMTS frequency bands, interference is possible only if the TX and RX are pointing one to the other (considering the antenna patterns). For higher frequencies, typically higher than 10 GHz, also scattering from hydrometeors can occurr, thus causing unwanted interference also when the two antennas are not pointing one to the other, but their directivity functions overlap somehow. Maybe you can have a look at the following reference dealing with interference: C. Capsoni, L. Luini, M. D'Amico, "The MultiEXCELL model for the prediction of the radio interference due to hydrometeor scattering", Proceedings of the Fourth European Conference on Antennas and Propagation (EuCAP), 2010. I hope this helps. Regards, Lorenzo Luini

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  Hello Caroline,
  what is the carrier frequency you are referring to? Interference may be accounted for just by considering the standard link budget equation between the transmitter and the receiver that is gathering unwanted power from the transmitter. If you are dealing with GSM/UMTS frequency bands, interference is possible only if the TX and RX are pointing one to the other (considering the antenna patterns). For higher frequencies, typically higher than 10 GHz, also scattering from hydrometeors can occurr, thus causing unwanted interference also when the two antennas are not pointing one to the other, but their directivity functions overlap somehow. Maybe you can have a look at the following reference dealing with interference: C. Capsoni, L. Luini, M. D'Amico, "The MultiEXCELL model for the prediction of the radio interference due to hydrometeor scattering", Proceedings of the Fourth European Conference on Antennas and Propagation (EuCAP), 2010. I hope this helps. Regards,
  
  Lorenzo Luini

  Jul 23, 2012
• 
  Caroline Alenoghena · Federal University of Technology Minna

  Thanks colleagues, your suggestions are most helpful, an indeed grateful.

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  Thanks colleagues, your suggestions are most helpful, an indeed grateful.

  Jul 24, 2012
• 
  Davor Virkes · University of Zagreb

  It can not be expressed directly, but only by probability, and it will depend upon the technology you are employing. So your prediction gives you some C/I at some point, which is 50% probability of error, and applying your probability density chart, you can estimate how severe is the interference problem, or on the other hand you can find a border where predicted C/I is such that probability of interference falls below some acceptable level, say 10% or 5%. Remember that the interference problem is highly dependent upon the technology you are playing with, so you better start from there.

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  It can not be expressed directly, but only by probability, and it will depend upon the technology you are employing. So your prediction gives you some C/I at some point, which is 50% probability of error, and applying your probability density chart, you can estimate how severe is the interference problem, or on the other hand you can find a border where predicted C/I is such that probability of interference falls below some acceptable level, say 10% or 5%.
  Remember that the interference problem is highly dependent upon the technology you are playing with, so you better start from there.

  Jul 24, 2012