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Nothing special, as usually do not put it near metallic objects and respect the polarization (usually vertical so put the antenna like on first image, connector up or down)
In practice a wifi antenna is made to be matched at both 2.45 GHz and 5 GHz (laptops etc). For home purposes it can be done with horn type antennas since it can provide very broadband response. In these two cases you dont need anything. However if you have two different antennas, one for 2.45 and other for 5 GHz band you will need a switch or a diplexer to isolate two antennas. Otherwise their impedances will be seen in parallel from the receiver.
Your welcome! The monopole should be placed 31 mm from the back and at the middle from the sides i.e. at 43 mm (86 / 2). This position has been optimized in the 3D FEM solver, but theoretically it's lambda/4 from the back . Any metal sheet will work if you respect the internal dimensions of the horn, an other point is the poor conductivity of some alloys which can lower the gain. And not all alloys are solderable. The best choice still copper, but more expensive than brass.
The monopole is exactly 3 cm length, it seems to be longer because of the optical effect ;) Can you clarify your question about measurements ? You are talking about the physical dimensions or the S parameters measurements ?
Yes, the diameter of the wire will change the BW but also the central frequency. However 1mm +/- 0.5mm will not affect a lot the result.
DIY Horn antenna for the Wi...View Instructable »
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