Waveguide-to-Microstrip Nonbinary Power Dividers

A novel spatial power combiner (SPC), exploiting nonbinary and odd power divisions and working in full Ka-band, is designed and measured in this letter. Starting from the theory that rules the power division captured by the waveguide-to-microstrip transitions with different power division factors, a full 3-D EM model has been created and simulated along with a working manufactured prototype. The measurements demonstrated how all the broadband transmission characteristics of the Finline transitions (S11 > 10 dB and minimum losses) are preserved, also avoiding any resonant behavior possibly introduced by the nonsymmetry of the structure. This is the first example of a non-TEM and non-Radial SPC with nonbinary power division. In this case, a power division/recombination by five has been performed.