Wireless antenna question

mgmguy1 · August 2006

Team,
I am studying Domain 1.0 section 1.8 Identify factors which affect the range and speed of wireless service (For example: interference, antenna type
and environmental factors).

When it comes to antenna type, Is comptia refering to these types of antenna? Or am I going to deep?
1. Omnidirectional
2.Parabolic or dish
3.Yagi
4.Patch
5.Sector

Please advise

Danman32 · August 2006

That might be a bit too deep. But if it is interesting to you, go for it!

mgmguy1 · August 2006

O'k what I think Comptia wants to know about antenna types is this.

1. Omnidirectional Antenna - issues and receives wireless signals with equal strength and clarity in all directions.

2. Directional Antenna- issues wireless signals along a single direction. This type of antenna is used when the source needs to communicate with one destination, as in a point-to-point link

You can go deeper then this. for example:

Omnidirectional Antenna - Common omnidirectional antennas are the whip antenna, a vertically oriented dipole antenna, the discone antenna, and the horizontal loop antenna.

Directional Antenna - The most common types of directional antenna are the yagi antenna, the log-periodic antenna, and the corner reflector antenna , which are frequently combined and commercially sold as residential TV antennas

There is alot of good infomation on the web about this.
Here is where I got my information

1. http://en.wikipedia.org/wiki/Category:Radio_frequency_antenna_types

2.http://www.sharperconcepts.net/wifi_antenna.html

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supertechCETma · August 2006

if I were you... I would seriously reconsider my choice of reference materials.

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supertechCETma · August 2006

I think this is more of what you are looking for:

1.8 Identify factors which affect the range and speed of wireless service (For example: interference, antenna type and environmental factors).
Wireless service is affected by several environment factors, potential interference points, and the type of antenna used.

802.11b and 802.11g is more susceptible to other device interference as compared to 802.11a. 802.11b and 802.11g use the 2.4 Ghz spectrum - an unlicensed spectrum used by common devices such as microwave ovens and portable phones. This can lead to data transmission problems when one of those other devices is in use.

802.11a, however, has a much shorter range than 802.11b or g. Its use of a higher frequency reduces the area an access point can cover, providing one fourth to one third less range than the equivocal 802.11b or 802.11g access point.

There are different antenna shapes which you can purchase to increase the range of your access points. In addition, there are remote antennas you can mount higher than the access point. The antenna on your wireless NIC can also be a deciding factor as smaller built-in antennas may have less range than antennas which are larger and stick out from the computer.

The layout of your building is also a factor in the range of your wireless network. If your building has a lot of concrete walls, this can reduce the area your access points can cover.

Retrieved from http://www.learnthat.com/certification/learn.asp?id=432&index=70

A basic knowledge of antennae will strengthen your undestanding of wireless but an indepth knowledge is not required. also, antennae transmit & propagate and collect & receive. they don't issue.

802.11 Wireless Networks: The Definitive Guide

http://www.oreilly.com/catalog/802dot11/chapter/ch15.html

Wireless antenna question

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