Path: ...!news.mixmin.net!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: Small magnetic tunable filter for 6G and beyond
Date: Thu, 30 May 2024 00:13:17 +1000
Organization: A noiseless patient Spider
Lines: 53
Message-ID: <v37d63$15u5b$1@dont-email.me>
References: <v314gp$ralt$1@solani.org>
 <r2g95j9peg89n6th8i9638hiqd7ntamp3m@4ax.com>
 <4pi95jln0ibs3afptjm6gn319uh90ub6dn@4ax.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Injection-Date: Wed, 29 May 2024 16:13:24 +0200 (CEST)
Injection-Info: dont-email.me; posting-host="aadcd11aabf832e072bbfc3a4de4d04c";
	logging-data="1243307"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1+yDA3kWwT+9R0jU5y5ZmMI6KVfcH+9YrE="
User-Agent: Mozilla Thunderbird
Cancel-Lock: sha1:zS3xiFWqoF9hg3jOtP2AxMDC984=
In-Reply-To: <4pi95jln0ibs3afptjm6gn319uh90ub6dn@4ax.com>
Content-Language: en-US
Bytes: 3853

On 28/05/2024 4:06 am, john larkin wrote:
> 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.

But they aren't tunable.

-- 
Bill Sloman, Sydney