This final degree project presents the design and integration of the components of a 2-port reconfigurable microwave discriminator, main component of a 2-bit reconfigurable frequency measurement system. Furthermore, it is explained the typology of the microwave discriminators and the instantaneous frequency measurement receiver. The reconfigurable frequency measurement system allows identification of any unknown signal in the frequency range from 30 to 40 GHz, corresponding Ka-Band. The microwave discriminator is the main component that performs the frequency identification function within the receiver. This receiver is implemented from the combination of uniplanar technology and radio frequency microelectromechanical systems (RF-MEMS). The microwave discriminator is formed by a MEMS 180º phase shifter, a power divider which also acts as a power combiner, a cpw-slotline transition and a reference line; all these components are integrated on a quartz substrate. The final design has been made from the union between a cpw-slotline transition and a MEMS 180º phase shifter and it has been tested than the results obtained with ADS/Momentum are suitable. Later this resultant design has been implemented with the other components of the microwave discriminator. In this way has obtained the 2 bits of identification of the signal at the output of the microwave discriminator. The technologies used during the development of this device allow the circuit to be more compact and smaller, to consume less power and to be easier to manufacture compared to bulky instantaneous frequency measurement techniques.