This final grade project describes the concept, criteria and design of a 2-port microwave discriminator, which is the fundamental element in a frequency measurement system. The microwave discriminator performs the function of detecting unknown frequencies in the Ka band (30-40 GHz). The discriminator consists of five lines: the first line is a 180 ° phase shifter that acts as a reference and allows the generation of microwave discriminators reconfigurable of reduced size and weight. The following delay lines of length "λ", "3λ/ 2", "2λ" and "5λ/2" are the main elements for the construction all these lines are connected to the power divider at the input and power combiner at the output and finally a system of SPQT switching. Coplanar technology is used for its design. The power divider used is designed with coplanar technology. It is a Wilkinson splitter that also acts as a power combiner connected to the reference line and to the delay line. The input and output ports of the discriminator will be the input port of the splitter and the output port of the combiner respectively. The simulations of each delay line and the final design of the discriminator were performed with ADS / Momentum obtaining satisfactory results. This has enabled the resulting design to be integrated with the other components of the discriminator to subsequently obtain the signal identification bits.