On rectangular waveguide, almost everyone conforms to the inside dimensions of the waveguide for the frequency. However for some frequencies there are up to three different waveguide sizes that will work. Lots of overlap in the bandwidths of wavelengths.
But for dual pol antennas, the feeds all have a circular waveguide and those are much less common and not standardized. So they pick a diameter that fits the center of their bandwidth. .750”, .777” .780” are all common sizes used for 11 GHz. And really you can mate them with each other with almost no return loss issues. My transgender / interspecies adapter products generally use the exact diameter the antenna it mates with uses. Now, that is the inside of the waveguide. The outside of the waveguide, the “nose” of the antenna, that is a variety of inventions by the various radio manufacturers. The Remec design is most common. A handful of radio vendors used that form factor. It is a bit larger than it needs to be with the exception of 6 GHz rectangular. That just barely fits in a Remec and would not fit in a Dragonwave. Exalt is so close to Remec it is laughable. I really wish they would have just used the same dimensions, but everybody has to be different. I think they may have believe that if they had their own standard, it would increase brand loyalty as nobody wants to change antennas. But in reality, I can make any radio work with any antenna if the frequencies are similar. From: Colin Stanners Sent: Friday, February 08, 2019 2:56 PM To: AnimalFarm Microwave Users Group Subject: [AFMUG] Why hasn't there been a radio-antenna waveguide standard? Probably more a question for Chuck then anyone else. There's (ignoring frequency-related size) at least a dozen waveguide connector standards to interface radios with antennas... when buying a licensed backhaul radio, pretty much every physical and software interface on the unit conforms to a standard, except the antenna interface. But it seems that a physical-only interface like that would be the easiest to standardize. Any idea why that has never happened in the industry? -------------------------------------------------------------------------------- -- AF mailing list [email protected] http://af.afmug.com/mailman/listinfo/af_af.afmug.com
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