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
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.
Hope you can help.
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?
Any advice would be greatly appreciated.