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matching 2 sources to 1 antenna - RF Cafe Forums

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 Facebook page, please do.

Below are all of the forum threads, including all the responses to the original posts.


bamatom
Post subject: matching 2 sources to 1 antenna Posted: Wed Jun 21, 2006 2:20 pm

Lieutenant

Joined: Thu May 18, 2006 9:46 am
Posts: 3
I have two 50 Ohm sources, 190 MHz and 160 MHz, 10 dBm. I want to connect both sources to one lambda/4 antenna (center frequency = 175 MHz) to transmit the two signals at the same time. Do I need something like a directional coupler because I want a high isolation between the two sources? In addition, I need a matching circuit for both sources. Does anyone have an idea what type of circuit design will be the best choice for this application?
Thank you for your help.


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karthik
Post subject: Posted: Wed Jun 21, 2006 5:33 pm

Colonel

Joined: Tue Apr 11, 2006 8:13 pm
Posts: 34
You could use a directional coupler or a Wilkinson power divider, though at 175 MHz, it might be quite big.







Posted  11/12/2012
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