-
Junior Member
Reputation: 12
Cross polarized antenna modeling in Atoll
Dear experts
Do we have to use radiation pattern of P45 or M45 when we model a new antenna in Atoll ?
P45 means positive polarization (+45) and M45 means Minus polarization (-45 ) , now which pattern is the right one to use if the antenna Polarization is ±45°?
Then if I used P45 or M45 when creating new antenna , what is the impact on the accuracy of the signal prediction ?
please help .
-
2020-01-19 05:28 AM
# ADS
Circuit advertisement
-
VIP Member
Reputation: 1716
Re: Cross polarized antenna modeling in Atoll
i am using P45. As i know Atoll does itself +- polarization calculation.
-
VIP Member
Reputation: 1970
1 out of 1 members found this post helpful.
Re: Cross polarized antenna modeling in Atoll
The signal attenuation in space in the case of signal emission at an angle of +45 and -45 is the same. For calculations you need to use any of the P45 or M45 patterns.
-
Post Thanks - 2 Thanks
-
VIP Member
Reputation: 1716
Re: Cross polarized antenna modeling in Atoll
Its not about attenuation. Its about MIMO configuration.
![Quote](images/misc/quote_icon.png)
Originally Posted by
slava121
The signal attenuation in space in the case of signal emission at an angle of +45 and -45 is the same. For calculations you need to use any of the P45 or M45 patterns.
-
VIP Member
Reputation: 1970
1 out of 1 members found this post helpful.
Re: Cross polarized antenna modeling in Atoll
@AlbawkeriAre you discussing using an antenna pattern for which technology?
-
Junior Member
Reputation: 12
Re: Cross polarized antenna modeling in Atoll
![Quote](images/misc/quote_icon.png)
Originally Posted by
slava121
@AlbawkeriAre you discussing using an antenna pattern for which technology?
Thank you boss , my question is general and independent of the technology . I need to use different antenna radiation patterns with LTE and sometimes with CDMA . MIMO is considered during LTE coverage prediction , but in CDMA just receiving diversity .
-
Junior Member
Reputation: 12
Re: Cross polarized antenna modeling in Atoll
If you check the gain and vertical beam width for +45 and -45 with the same electrical tilt radiation pattern , there is a slight difference .
-
Junior Member
Reputation: 12
Re: Cross polarized antenna modeling in Atoll
The attenuation is different a little bit . e.g Huawei ADU4518R7 , 882Mhz , 0 electrical tilt , both patterns for m45 and p45 are listed below:
M45 |
P45 |
0 |
0.01 |
0 |
0 |
1 |
0.01 |
1 |
0 |
2 |
0.03 |
2 |
0 |
3 |
0.04 |
3 |
0.02 |
4 |
0.07 |
4 |
0.03 |
5 |
0.1 |
5 |
0.06 |
6 |
0.13 |
6 |
0.09 |
7 |
0.18 |
7 |
0.12 |
8 |
0.22 |
8 |
0.16 |
9 |
0.27 |
9 |
0.21 |
-
VIP Member
Reputation: 1970
1 out of 1 members found this post helpful.
Re: Cross polarized antenna modeling in Atoll
It is impossible to manufacture an antenna, I will develop in a large range of frequencies with ideal characteristics.
Antenna parameters:
Frequency range (MHz)
690 - 960 1710 - 2690
690 - 803 790 - 862 824 - 894 880 - 960 1710 - 1990 1920 - 2200 2200 - 2490 2490 - 2690.
-
VIP Member
Reputation: 1970
1 out of 1 members found this post helpful.
Re: Cross polarized antenna modeling in Atoll
You need to look at the beam patterns for polarization + 45 and -45, for 882Mhz frequency:
M45.jpg - M45
P45.jpg - P45
From the analysis of the diagram, it can be seen that the beam of the beam pattern is M45 in the vertical plane (beam width 9 degrees), has a factory preliminary setting -1 degrees. Although М45 data is specified for ADU4518R7_0882_X_CO_M45_00T_r, i.e. 0 degrees.
So there 's a difference in attenuation for: ADU4518R7_0882_X_CO_M45_00T_r and ADU4518R7_0882_X_CO_P45_00T_r, which you reflected in the comparison table.
Bookmarks