Intersystem Isolation

[adewijaya]

How about this issues :

1. How to Calculation of intersystem isolation?
2. What's about Horizontal isolation?
3. What's about Vertical isolation?
4. How about for Isolation for other directions?

[Irna]

How about this issues :

1. How to Calculation of intersystem isolation?
2. What's about Horizontal isolation?
3. What's about Vertical isolation?
4. How about for Isolation for other directions?

i try to answer :

1. Formula for the calculation of horizontal isolation:
DH（dB） = 22 +20 log (S /λ) － （Gt ＋ Gr）
According to this formula,
S ＝ Horizontal distance between antennas (m).
λ ＝ Wavelength in correspondence to the center frequency (m).
Gt ＝ Antenna gain transmitted on the direction between the receiving and transmitting antenna (dBi ).
Gr ＝ Antenna gain received on the direction between the receiving and transmitting antenna (dBi ).
Usually, base station antennas on the horizontal direction will not be located face to face, and they will be installed at a certain angle. Classic spatial isolation data of some directional antennas which are not located face to face are listed as follows:

2. Calculation of the vertical isolation: DV ( dB ) ＝ 28 ＋ 40 log (S /λ)
According to this formula:
S ＝ The vertical distance of antennas (m).
λ ＝ Wavelength in correspondence to the center frequency (m).

3. DS ( dB )＝（DV - DH）×（θ/ 90）+ DH
According to this formula:
θ＝The angle between the vertical directions of antennas (degree).
λ＝ Wavelength in correspondence to the center frequency (m).

Therefore, i suggest that the inclined isolation within LOS distance should be calculated according to the calculation method for horizontal isolation.

[adewijaya]

comprehensif answer ! with formula and brief explanation. Another member let's take this to be example ;)