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wideband coupler design in ADS

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goldensol

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langer coupler wideband

I want to design a wideband direct coupler with small size from 100MHz-500MHz.Could you give me some advice?

The peak power level over 150W.
 

flatulent

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wirepack sage

The ususal method for this bandwidth is to use a multiple finger Lange coupler.
 

jamez

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wideband coupler

Hi,

It is a large size even using a multiple finger Lange coupler,
a bended caxial coupler may be ok.
 

molloy

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Re: wideband coupler

goldensol said:
I want to design a wideband direct coupler with small size from 100MHz-500MHz.Could you give me some advice?

The peak power level over 150W.

For a directional coupler (at least 20dB i think) you could try a short coupler. I mean you could design the DC in a higher band (lets suppose 1GHz) to have lets say a coupling of 5dB and then work in your band where you have a slope in coupling. Then you can compensate the slope with a low pass filter
hoping this can help you :wink:
 

Sinuous

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I have seen a technique where the printed Lange Coupler is replaced with chips and wire to reduce size at low frequencies. I will see if I can did up the article, but in the mean time maybe you can figure out what the values are by transforming the lines into the equivalent caps and inductors.
 

g579

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It is quite common to make directional couplers for the TV band freqs (100 - 800 MHz), with a 2 hole ferrite. There are a lot of literature about it. The only real drawback is the limited (max 20 dB) isolation.
g579
 

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