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MLP - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues. Below are all of the old forum threads, including all the responses to the original posts.

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

gogober
Post subject: MLP
Unread postPosted: Thu Nov 25, 2004 1:35 pm

can some one explain me this circute,and why Rs>RL?
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Itay
Post subject:
Unread postPosted: Thu Nov 25, 2004 3:03 pm

Greetings Gogober:

this circuit is called L-Pad attenuator, and is used to match between 2 impedance levels. The ratio doesn't have to be necessarily RL>RS, it can be also RS>RL, all depends on the application. This attenuator is basically derived from the T attenuator (with one of the series resistors is reduced to value of 0-ohm). This attenuator is designed to have minimum attenuation value.

You can calculate the resistor values of R1, R2 according to the following formulas:

R1=SQRT( RS(RS-RL))

T2=SQRT ((RS*RL^2)/(RS-RL))

Good luck,
Itay



Posted  11/12/2012

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