Why Does 802.11a Struggle with Penetration Compared to 802.11g?

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Discussion Overview

The discussion focuses on the comparative penetration capabilities of 802.11a and 802.11g wireless standards, particularly in relation to their operating frequencies. Participants explore the implications of these frequencies on signal strength and range, as well as the physical principles governing electromagnetic radiation.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant notes the difference in frequencies between 802.11a and 802.11g, questioning whether this affects the cell size per packet.
  • Another participant suggests that the strength of the signal is a primary factor in the performance differences between the two standards.
  • Several participants argue that the 2.4GHz band of 802.11g experiences less attenuation compared to the 5GHz band of 802.11a, which affects penetration through objects.
  • There is a reference to the general principle that as frequency increases, the ability to penetrate objects decreases, with an analogy to visible light's inability to penetrate paper due to its high frequency.

Areas of Agreement / Disagreement

Participants generally agree that frequency plays a significant role in the penetration capabilities of the two standards, but the discussion includes multiple perspectives on the extent and implications of this difference. No consensus is reached on all aspects of the topic.

Contextual Notes

The discussion does not resolve the complexities of signal strength, attenuation, and their dependence on environmental factors. Assumptions regarding the relationship between frequency and penetration are present but not fully explored.

jastewart
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I am looking into why 802.11a does not permeate as well as 802.11g. I know that they are different freq. Does this mean a different cell size per packet as well?
 
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Almost all of the extra range comes from the different frequencies, the 2.4GHz band that 802.11g operates in attenuates significantly less than the 5GHz band that 802.11a operates in. As frequency increases (wavelength decreases) the ability to penetrate objects goes down (generally, some exceptions).

As an extreme example, visible light is the same stuff as wifi signals (EM radiation), yet is unable to penetrate even thin paper due to its extremely high frequency.
 
RFMatt said:
Almost all of the extra range comes from the different frequencies, the 2.4GHz band that 802.11g operates in attenuates significantly less than the 5GHz band that 802.11a operates in. As frequency increases (wavelength decreases) the ability to penetrate objects goes down (generally, some exceptions).

As an extreme example, visible light is the same stuff as wifi signals (EM radiation), yet is unable to penetrate even thin paper due to its extremely high frequency.
Thank you! Excellent!
 

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