[SI-LIST] Re: Filter Question about 2.4G and 40M
- From: Ray Anderson <ray.anderson@xxxxxxxxxx>
- To: "zhangkun (Zkun)" <zkun.zhang@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Thu, 9 Feb 2012 09:19:44 -0800
Zhangkun-
Your message really didn't pose a question, but I get the sense you
are trying to separate both signals that are present on your channel.
It sounds like your filter is either a highpass or bandpass filter
that is attenuating the 40 MHz signal but passing the 2.4GHz signal.
Is that correct? If you need to be able to recover and separate both
signals in the channel a diplexer is probably what you need.
See any good RF filter design text for details.
(or do a Google search on 'diplexer design')
Regards,
-Ray WB6TPU
Raymond Anderson
Senior Signal Integrity Staff Engineer
Programmable Platforms Development
Silicon Technology Group
Signal Integrity and Package Development Department
Xilinx Inc.
2100 Logic Drive
San Jose, California 95124
(408) 626-6277
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of zhangkun (Zkun)
Sent: Thursday, February 09, 2012 1:00 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Filter Question about 2.4G and 40M
Dear All
In our product, there is 2.4G signal and 40M signal in a channel. The 2.4G
signal is about 20dbm. I found out that I could not filter the 40MHz signal.
I have measure the filter by means of VNA. The S21 of the filter at 40MHz is
-20db. However this filter could restrain the 40M signal, while there is also
2.4G signal.
Best Regards
Zhangkun
2012-2-9
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
This email and any attachments are intended for the sole use of the named
recipient(s) and contain(s) confidential information that may be proprietary,
privileged or copyrighted under applicable law. If you are not the intended
recipient, do not read, copy, or forward this email message or any attachments.
Delete this email message and any attachments immediately.
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
