On 04/16/2013 08:04 PM, Attila Kinali wrote:
On Mon, 15 Apr 2013 23:00:49 -0700
Jim Lux<[email protected]> wrote:
the effect of a strong multipath (which is what the choke ring
suppresses) would be a LOT bigger than that..
Uhmm.. to my understanding, this is not quite true.
The choke ring does not surpress general multipath, but
the waves from near and below the horizon, which are often
full multipath issues.
Well, it's an approximation against the most likely sources, and has
proven effective for exactly this form of mittigation. Arguing about the
semantics fills no real purpose.
You can see the choke rings as forming of a specific wave impedance
(or wave resistance, if you want) in the region at the top.
At other places, this technique is known as electromagnetic bandgap.
You typically put three spatial zeros for the relevant frequencies at or
sligthly below the horizon, with rotational symmetric around the axis of
the antenna.
Cheers,
Magnus
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