Fri Jan 02, 2015 1:28 am
这取决于我将努力实现。
If I need multiple clients in a small angular region (less than 60 dgr) at greater distances (2-5 km), I would choose a sector.
大于,比方说,60度角relatively great distances, that's a job for multiple sectors.
Of course, a single client far away, that's the job of a dish.
For many clients which are quite near, let's say less than 2-3 km, an omni antenna would do.
And a lot of clients at variable distances, well I think this is the place for some antennas with lower gain and worse directivity, like the ones in the pdf.
But any low gain outdoor panel would give the same. But sectors, if you give it a few degrees downwards tilt to cover the clients just next to the tower, would also do a good job.
So I think it just comes down to a single question: What's the price compared to a wide angle sector?
Other things that come to mind: Are they dual polarity?
And an issue not to be neglected: Horn antennas, which have that hole in the middle, tend to collect spiders, small hornet nests and other insects. So unless there is some kind of randome for them, some maintenance could be required.