If you need to prototype or build a lumped element RF filter, check
out the RF Filter PCBs at RF Bites.

http://www.rfbites.com

In article .com,
wrote:

If you need to prototype or build a lumped element RF filter, check
out the RF Filter PCBs at RF Bites.

http://www.rfbites.com

Those are not very good coax to PCB connectors. You can do better. Must
be pretty low frequency stuff ( 1 GHz ) if you are using FR4.

--
Telamon
Ventura, California

On Nov 3, 5:49 pm, Telamon
wrote:
In article .com,

wrote:
If you need to prototype or build a lumped element RF filter, check
out the RF Filter PCBs at RF Bites.

http://www.rfbites.com

Those are not very good coax to PCB connectors. You can do better. Must
be pretty low frequency stuff ( 1 GHz ) if you are using FR4.

--
Telamon
Ventura, California


So, what material do you use over 1GHz? You buget guy must really not
like you. BTW, I didn't design these boards, nor to I work for these
guys. I just got my board in the other day and was pumped up when I
was able to build up a filter quickly. It's in my tuner right now,
filtering away. My filter has good rejection (50dB) up to 3.5GHz, and
it starts to fall apart.

On Nov 3, 5:49 pm, Telamon
wrote:
In article .com,

wrote:
If you need to prototype or build a lumped element RF filter, check
out the RF Filter PCBs at RF Bites.

http://www.rfbites.com

Those are not very good coax to PCB connectors. You can do better. Must
be pretty low frequency stuff ( 1 GHz ) if you are using FR4.

--
Telamon
Ventura, California

Connectors are rated to 12GHz.

FR-4 is good up to 3.5GHz, then it starts to fall apart.

On Nov 3, 6:17 pm, wrote:
On Nov 3, 5:49 pm, Telamon
wrote:

In article .com,

wrote:
If you need to prototype or build a lumped element RF filter, check
out the RF Filter PCBs at RF Bites.

http://www.rfbites.com

Those are not very good coax to PCB connectors. You can do better. Must
be pretty low frequency stuff ( 1 GHz ) if you are using FR4.

--
Telamon
Ventura, California

Connectors are rated to 12GHz.

FR-4 is good up to 3.5GHz, then it starts to fall apart.

Telamon,

I would be glad to send you a spaned out response from the Net A. Let
me know.

FH

In article . com,
wrote:

On Nov 3, 5:49 pm, Telamon
wrote:
In article .com,

wrote:
If you need to prototype or build a lumped element RF filter, check
out the RF Filter PCBs at RF Bites.

http://www.rfbites.com

Those are not very good coax to PCB connectors. You can do better. Must
be pretty low frequency stuff ( 1 GHz ) if you are using FR4.



So, what material do you use over 1GHz?

Commercially you could use Rogers materials. A good step over FR4 would
be Rogers 4003. More expensive that that would be Rogers 5880.
Comparable to Rogers 5880 would be 25N Arlon.

You buget guy must really not like you.

The bean counters don't like me at all.

BTW, I didn't design these boards, nor to I work for these guys. I
just got my board in the other day and was pumped up when I was able
to build up a filter quickly. It's in my tuner right now, filtering
away. My filter has good rejection (50dB) up to 3.5GHz, and it
starts to fall apart.

Your insertion loss will not be good over 1 GHz. Sure the filter will
work over 1 Ghz.

If you have a fast enough TDR you can see that that connector is very
capacitive looking where the pin is on the board and the return losses
will not be good. Since you use them on both ends of the board you will
get reflections between them.

The footprint for the connector is as important as the connector itself.

--
Telamon
Ventura, California

In article . com,
wrote:

On Nov 3, 5:49 pm, Telamon
wrote:
In article .com,

wrote:
If you need to prototype or build a lumped element RF filter, check
out the RF Filter PCBs at RF Bites.

http://www.rfbites.com

Those are not very good coax to PCB connectors. You can do better. Must
be pretty low frequency stuff ( 1 GHz ) if you are using FR4.

--
Telamon
Ventura, California

Connectors are rated to 12GHz.

FR-4 is good up to 3.5GHz, then it starts to fall apart.

I would not use FR4 over 1GHz.

--
Telamon
Ventura, California

On Sun, 04 Nov 2007 00:17:26 -0000, wrote:

On Nov 3, 5:49 pm, Telamon
wrote:
In article .com,

wrote:
If you need to prototype or build a lumped element RF filter, check
out the RF Filter PCBs at RF Bites.

http://www.rfbites.com

Those are not very good coax to PCB connectors. You can do better. Must
be pretty low frequency stuff ( 1 GHz ) if you are using FR4.

--
Telamon
Ventura, California

Connectors are rated to 12GHz.

FR-4 is good up to 3.5GHz, then it starts to fall apart.

http://en.wikipedia.org/wiki/FR4

On Nov 5, 5:21 am, David wrote:
On Sun, 04 Nov 2007 00:17:26 -0000, wrote:
On Nov 3, 5:49 pm, Telamon
wrote:
In article .com,

wrote:
If you need to prototype or build a lumped element RF filter, check
out the RF Filter PCBs at RF Bites.

http://www.rfbites.com

Those are not very good coax to PCB connectors. You can do better. Must
be pretty low frequency stuff ( 1 GHz ) if you are using FR4.

--
Telamon
Ventura, California

Connectors are rated to 12GHz.

FR-4 is good up to 3.5GHz, then it starts to fall apart.

http://en.wikipedia.org/wiki/FR4- Hide quoted text -

- Show quoted text -

David - Good Info and Link. ~ RHF

On Nov 5, 6:21 am, David wrote:
On Sun, 04 Nov 2007 00:17:26 -0000, wrote:
On Nov 3, 5:49 pm, Telamon
wrote:
In article .com,

wrote:
If you need to prototype or build a lumped element RF filter, check
out the RF Filter PCBs at RF Bites.

http://www.rfbites.com

Those are not very good coax to PCB connectors. You can do better. Must
be pretty low frequency stuff ( 1 GHz ) if you are using FR4.

--
Telamon
Ventura, California

Connectors are rated to 12GHz.

FR-4 is good up to 3.5GHz, then it starts to fall apart.

http://en.wikipedia.org/wiki/FR4- Hide quoted text -

- Show quoted text -

Hi David,

Good article. I partially agree with Talamon that FR4 is not ideal
over 1GHz, if you have the budget for Roger's material and the specs
that necessitate such performance in your substrate. In the commercial
world, you would have a hard time justifying such an expense, so most
designers have to eat the performance issues and work a little harder
to develop more robust designs to handle the gross tolerance swings. I
would challenge anyone to find a PCS cell phone (1.9GHz) or a
commercial GPS with Roger's material. When I said that the FR-4
material was good up to 3.5GHz, that means I am getting good rejection
in my filters up to that frequency. I wouldn't design my passband to
be anything much over 2 GHz. Isn't there a saying that goes something
like, "Any average Engineer can design a $50,000 car, it takes a good
Engineer to design a $15,000 car." Food for thought.

FH