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From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: Small magnetic tunable filter for 6G and beyond
Date: Mon, 27 May 2024 11:06:17 -0700
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On Mon, 27 May 2024 13:27:02 -0400, Joe Gwinn <joegwinn@comcast.net>
wrote:

>On Mon, 27 May 2024 05:08:40 GMT, Jan Panteltje <alien@comet.invalid>
>wrote:
>
>>To 6G and beyond: Engineers unlock the next generation of wireless communications:
>> https://www.sciencedaily.com/releases/2024/05/240524114938.htm
>>Source:
>> University of Pennsylvania School of Engineering and Applied Science
>>Summary:
>> Engineers have developed a new tool that could unlock 6G and the next generation of wireless networks: an adjustable filter that can successfully prevent interference in high-frequency bands of the electromagnetic spectrum.
>>partial quote:
>> What makes the filter adjustable is a unique material, "yttrium iron garnet" (YIG),
>> a blend of yttrium, a rare earth metal, along with iron and oxygen.
>> "What's special about YIG is that it propagates a magnetic spin wave," says Olsson,
>> referring to the type of wave created in magnetic materials when electrons spin in a synchronized fashion.
>> When exposed to a magnetic field, the magnetic spin wave generated by YIG changes frequency.
>> "By adjusting the magnetic field," says Xingyu Du, a doctoral student in Olsson's lab and the first author of the paper,
>> "the YIG filter achieves continuous frequency tuning across an extremely broad frequency band."
>> As a result, the new filter can be tuned to any frequency between 3.4 GHz and 11.1 GHz,
>> which covers much of the new territory the FCC has opened up in the FR3 band.
>
>As with many breathless announcements of breakthroughs, this may not
>fare well in reality, for all the reasons mentioned up thread.  But
>anyway, here is the full announcement:
>
>.<https://blog.seas.upenn.edu/to-6g-and-beyond-penn-engineers-unlock-the-next-generation-of-wireless-communications/>
>
>The item about LightSquared is amusingly off-mark:  The problem with
>LightSquared was that their proposed ground-based transmissions were
>far too strong, and threatened to overwhelm existing GPS receivers, in
>particular those in safety-of-flight involved GPS receivers. Inventing
>a fancy new filter won't help any more than boring old filter
>technologies, as it's the GPS receivers would need to be updated and
>recertified, which is a very big deal.
>
>I haven't looked, but I bet there is an arXive paper on the yig filter
>details.
>
>Joe Gwinn

Does satellite nevigation need a low-Q tunable bandpass filter? There
are great SAW-type resonators around with better filtering, no magnets
required.