![]() My questions are as follows: What is a Smith chart and how do I use it to improve my attenuator+cable design? Is this a feasible method for creating basic fixed RF attenuators given that they don't need to be super accurate and only need to function over a very specific range of frequencies (905-920 ish MHz)? Basically I took apart a coaxial cable and hand soldered in some close-to-calculated carbon 5% resistors in between the two SMA connector ends. Now I should mention that my prototype is very shotty. However, the smith chart is all over the place when I measure S11. I have prototyped one using just off the shelf resistors in a T-pad configuration that gives me a decent level of attenuation (pretty flat 19dB) when I perform an S21 measurement using my network analyzer. I need a few different levels of attenuation but each different attenuator can be fixed. ![]() I'm working on designing some hopefully simple RF (912 MHz) attenuators.
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