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RF Choke - RF Cafe Forums
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SilencerEx
Post subject: RF Choke
Unread postPosted: Tue May
24, 2005 5:53 am
Offline
Captain
Joined: Tue May 24, 2005
5:41 am
Posts: 5
Hi, I've build a class A microwave amplifier
for the frequency range 1GHz to 3 GHz with discrete components. Here's
the schematic:
Image
The power gain is 15 dB at 1GHz and 3 dB
at 3GHz.
It's working fine, but I think the RF chokes are limiting
the gain. At the moment I'm using AVX Accu-L inductors which have a
self resonance frequency of 1.8 GHz but they have a small inductance.
What kind of choke is commonly used in this frequency range?
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Guest
Post subject:
Unread postPosted:
Tue May 24, 2005 9:00 am
Your right, the choke will be limiting
your gain. The self resonance needs to be above 3GHz. Look at coilcraft,
they should have something that will work. If price is no object, then
you can use a conical inductor, they operate up to 40GHz. They are sold
by piconics, www.piconics.com.
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SilencerEx
Post subject: Re
Unread postPosted: Tue May 24, 2005 10:28 am
Offline
Captain
Joined: Tue May 24, 2005 5:41 am
Posts:
5
Thanks for your reply, so I just need inductors with a high self
resonance frequency. I've been ordering stuff at Farnell, but they don't
have a lot of microwave components. Does anyone know a supplier in Europe
which can deliver microwave components in small quantities within the
week?
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Guest
Post subject:
Unread postPosted: Tue May 24, 2005 3:16 pm
Hello,
Coilcraft
can provide you samples within a short time. I think that you can even
order samples throughout their website www.coilcraft.com
I have
done that many times before. Their coils are excellent. They even have
models which you can use in Microwave Office. If I recall correctly
there are built-in models in the Microwave Office for their wire-wound
coils.
You can also use Taiyo-Yuden chip inductors, they also
give samples within short time.
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SilencerEx
Post subject: Re
Unread postPosted: Tue May 24, 2005 6:23 pm
Offline
Captain
Joined: Tue May 24, 2005 5:41 am
Posts:
5
That's great news. I'll try it out immediatly.
Posted 11/12/2012
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