G-Wave BDA-SMR/N-37, Installation And Operating Manual

Page: 19 / 19

19 | P a g e
APPENDIX 2
The horizontal
I
h
and vertical
I
v
space antenna isolation for a scenario as in Figure 6 can be
computed analytically, using the following equations:
I
h
[db] = 22 + 20log
�
dh ∙ f
3 ∙ 10 8
� − GTx − GRx
*Under assumptions of far field condition)
I
v
[db] = 28 + 40log
�
dv ∙ f
3 ∙ 10
8
� − GTx − GRx
I
slant
[db] = (I
v
− I
h
) ∙
α
90
°
+ I
h
Antenna Separation variable definitions:
I
h
[dB] isolation between horizontally separated transmitter and receiver antennas
dh
[m]
the horizontal distance from the centre of interferer antenna to that of the
interfered with receiver antenna
dv
[m]
the vertical distance from the interferer antenna to the interfered with receiver
antenna, (measured from radiation centre-to-radiation centre)
f [Hz] the wavelength of the interfered with system frequency band
GTx
[dBi] gain of the transmitter antenna
GRx
[dBi] gain of the receiver antenna
I
v
[dB] Isolation between vertically separated transmitter and receiver antennas.
α [
°
]
arctan(
dv
dh)