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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 04:12:17 -0700
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On Mon, 27 May 2024 09:56:53 +0200, Jeroen Belleman
<jeroen@nospam.please> wrote:

>On 5/27/24 07:08, Jan Panteltje 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.
>> 
>
>YIG filter and resonators have always been a bit exotic. Maybe this
>will make them common-place. And more compact, hopefully! The YIG
>was tiny, sure, but the magnet wasn't.
>
>Jeroen Belleman

Yig filters and oscillators have been around for ages. It seems to me
that tuning them with a magnetic field is messy.