Directional coupler measures loss of a microstrip line + load easily

Recently we had to find a method to measure the loss of microstrip line connected to a socket pin. We could not access the load end of the line so with some help from a friendly supplier we found a way to measure the loss using the input of the line, a directional coupler and assorted test equipment. The brief paper describing this technique may be found on the Signal Processing Group Inc. website along with other interesting articles under the complementary menu.

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