Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views.
It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if
you would like to post something on RF Cafe's
page, please do.
Below are all of the forum threads, including all
the responses to the original posts.
Post subject: Practical Antenna Matching
Posted: Sat Jan 31, 2009 11:12 am
Joined: Sat Jan 31,
2009 11:09 am
I've build a microstrip antenna with a
probe feed. I've manufactured the antenna and
decided to build a matching circuit. I've taken
the antenna s-parameters from the network
analyzer and put it into ADS. Then I've build a
lumped matching circuit using a matching tool.
After that I've replaced the calculated values
with the closest values based on manufacturer's
datasheets. After that I've manufactured the
matching PCB circuit. However the results didn't
match and now I'm trying to figure what's wrong.
Maybe it's because I used a barrel
interconnector to connect two female sma's.
However, I don't know how can I get rid of it.
Maybe there is a way I can integrate the probe
into the circuit, like cutting the connector and
soldering the pin to the circuit.
Post subject: Re: Practical Antenna Matching
Posted: Thu Oct 01, 2009 8:22 am
Joined: Thu Oct 01, 2009
I'm sorry I can't help with your issue, (and
presumably since it has been several months, you
solved it already anyway), but I'm curious to know
how you went about designing the matching circuits.
I'm relatively new to RF design and I have a 2.4GHz
transceiver I need to match to a balun but I haven't
been able to find good information on how to do
that. The 'optimal load impedance specified by the
transceiver is something like 15 + j88 Ohm, and the
baluns only shows input impedances of 50 Ohm, or 100
Ohm, 150 Ohm, etc.
You mentioned a matching
tool. Is that software, hardware?
would be greatly appreciated.