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RE: like already said Multiple drivers for each pass band.

Posted by tomservo on April 29, 2017 at 08:25:53:
Hi Don
When two equal sources are about � wavelength apart or less, they "feel" each other's radiation pressure (aka mutual coupling) and add coherently into one new source. In that process, you have doubled power handling (having two drivers now) AND increased radiation efficiency because with coherent addition comes an effectively larger radiator.
BUT when two sources are more than � wl apart, they begin to radiate independently and by � wl separation they are independent sources and now when you go from one to two, you go up 3 dB because you no longer have mutual coupling that had raised the efficiency previously.
That increase in sensitivity has a practical upper limit at around 25% efficiency which would be about 106dB 1w1m. O

ne can see a difference between independent radiation and coherent coupling by inverting one of the drivers in each temporarily.
In the close coupled case where they add to become one source, the two sources nearly completely cancel each other out, with more than � wl spacing, only the radiation pattern changes when you invert one because they are two independent sources, not one.