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Practical Antenna Matching - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Original posts:

Amateur Radio | Antennas | Circuits & Components | Systems | Test & Measurement


abrak32
 Post subject: Practical Antenna Matching
Posted: Sat Jan 31, 2009 11:12 am 
 
Lieutenant

Joined: Sat Jan 31, 2009 11:09 am
Posts: 1
Hi,
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.
Thanks,
Neil


 
   
 
ARQuattr
 Post subject: Re: Practical Antenna Matching
Posted: Thu Oct 01, 2009 8:22 am 
 
Lieutenant

Joined: Thu Oct 01, 2009 7:49 am
Posts: 3
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.

Regards,
Angelo




Posted  11/12/2012

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