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field pattern

  • This topic has 2 replies, 1 voice, and was last updated 21 years ago by madhu.
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  • 24th April 2003 at 18:10 #35436
    madhu
    Guest

    if iam transmiting a power of 20dBm power trough a GSM antenna
    what would happen if i double the power for the same system
    ? will the field pattern change
    ? will the coverage area increase
    ? does antenna has any restrictions for the o/p power

    regards
    madhu

    27th April 2003 at 17:22 #35437
    dan
    Guest

    1. The field pattern will not change .Will remain the same(HPBW for the H and V planes, also the null points and all other parameters) as long as you will not change the environment( moving the antenna from that place to a better one). Remeber that all the diagrams from the datasheets are related to ideal propagation environment(no obstructions, continuous propagation,free Fresnel zone, no reflections and so on…). In the real field there are a lot of buildings,obstacles that will alter the ideal diagram: probably you already saw such a real diagram in any planning tool maps.
    2. Of course the coverage will increase but will not double it. Not even 50% of improvment
    3.I think that there are no RBS(BTS) that could damage an antenna due to high power. We are talking about GSM Environment and not radar where the average radiated power is like 300W or even more. 20dbm means 0.1W that is something regular even for a mobile. Usually BTS acts with 40-50Watts.

    regards,
    dan

    29th April 2003 at 15:21 #35438
    madhu
    Guest

    thanks
    dan for the information iam very much obliged

    regards
    madhu

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