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Author Topic: Source for small SMA bandpass filters  (Read 1444 times)

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Offline MattSRTopic starter

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Source for small SMA bandpass filters
« on: March 12, 2018, 10:19:18 am »
Does anyone have a good source of RF bandpass filters, of various frequencies and bandwidths from 50MHz to 6GHz?

I need them as front end filters on an SDR receiver that is wide open.

Thanks!
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Offline Mechatrommer

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Re: Source for small SMA bandpass filters
« Reply #1 on: March 12, 2018, 11:43:29 am »
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Offline daqq

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Re: Source for small SMA bandpass filters
« Reply #2 on: March 12, 2018, 12:00:14 pm »
Try searching minicircuits - they've got all things RF.
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Offline ThomasDK

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Re: Source for small SMA bandpass filters
« Reply #3 on: March 12, 2018, 02:08:34 pm »
Crystek has a range of filters as well. Mouser carries them.

Thomas
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Offline medical-nerd

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Re: Source for small SMA bandpass filters
« Reply #4 on: March 12, 2018, 02:43:37 pm »
Hiya

Don't know how to include the reference in this, but in the thread ' Breadboarding at RF ' the member whalpen posted details of his filter pcb's
:

Quote from: whalphen on January 27, 2018, 07:14:54 pm
Attached are some PCB layouts (Kicad files and Gerbers.) Schematic PDFs are there, too.  I've shared them all on OSH Park in case you just want to get the boards. (Links are in the attached file.)  Because they're so small, they are very cheap on OSH Park.  (The filters are $2.55 for three PCBs, delivered.)  The filter modules use 0805 parts, but 0806 and 0603 parts can fit, too.  You may notice a couple of the boards are laid out linearly.  One is laid out with adjacent inductors orthogonal to minimize interaction.

I typically purchase the capacitors and inductors from DigiKey.  I use low cost 50V ceramic caps C0G/NP0 or X7R.  For the HF and VHF stuff I do I haven't found any noticeable difference with the higher cost RF caps.  For inductors I prefer wirewound, low series resistance.  I also keep a couple of full sets of cheap capacitors from AliExpress to use in case I run out or need an uncommon value.  I've had good experience with the ones from China, except that I sometimes find them mis-lableled.  For example 15pF caps labeled as 13pF.  I always measure the values before using them.

Dunno what frequency they go up to but they look interesting.  I'm waiting for some to arrive.   :)

Also there are these:

https://oshpark.com/shared_projects/RwCKDBgk

Cheers
« Last Edit: March 12, 2018, 02:58:15 pm by medical-nerd »
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Offline Lord of nothing

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Re: Source for small SMA bandpass filters
« Reply #5 on: March 19, 2018, 06:29:14 pm »
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