Copyright: 1996 - 2024
BSEE - KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling
2 MB. Its primary purpose was to provide me with ready access to commonly needed
formulas and reference material while performing my work as an RF system and circuit
design engineer. The World Wide Web (Internet) was largely an unknown entity at
the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps
while tying up your telephone line, and a nice lady's voice announced "You've Got
Mail" when a new message arrived...
All trademarks, copyrights, patents, and other rights of ownership to images
and text used on the RF Cafe website are hereby acknowledged.
My Hobby Website:
applying notch filter on input and output part? - RF Cafe Forums
RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media
platforms dominating public commenting venues. RF Cafe Forums began sometime around
August of 2003 and was quite well-attended for many years. By 2010, Facebook and
Twitter were overwhelmingly dominating online personal interaction, and RF Cafe
Forums activity dropped off precipitously. If the folks at
phpBB would release a version with integrated
sign-in from the major social media platforms, I would resurrect the RF Cafe Forums,
but until then it is probably not worth the effort. Regardless, there are still
lots of great posts in the archive that ware worth looking at.
Below are the old forum threads, including responses to the original posts.
|-- Amateur Radio
Gripes & Humor
-- CAE, CAD, &
Test & Measurement
Post subject: applying notch filter on input and output part?
Unread postPosted: Tue Jun 21, 2005 2:13 am
know that the return loss can be happen is because we design notch filter
when we design on input and output impedance parts?
Post subject: Return Loss
Tue Jun 21, 2005 2:30 pm
Energy applied to any physical two-port
device made from inductors, capacitors, and transmission lines can only
go two places - through the device to the other port, or be reflected
back from the device.
Energy which doesn't go through the device
must therefore be reflected. Reflected energy reduces the return loss.
The only solution is to dissipate the energy in an attached resistance.
This is usually done by paralleling a filter with its complement and
terminating the complement with a resistor with eough power handling
capability to take care of all the stopband power.
Wed Jun 22, 2005 9:00 am
Or, depending on the frequency, use
an isolator. Similar to what was said above.