*UWB Circuits and Sub-Systems for Aerospace, Defence and Security Applications DOI: http://dx.doi.org/10.5772/intechopen.87095*

transfer the RF signal to/from the radiating element and perform some preliminary signal processing: phase and amplitude control, frequency conversion, and measurement of some fundamental signal characteristic.

Topologies and technologies need to be carefully leveraged in order to obtain the best possible performance. While in the past the trend was to design one circuit to implement one functionality applying the *divide-et-impera* (divide-and-conquer) paradigm nowadays we are looking at *all-in-one* highly integrated solutions. Of course this integration comes to the expanse of much higher circuit synthesis and analysis complexity.
