Design of Ka-Band Power Combining Network Based on High-Order Mode

This paper investigates the power combining network in Ka band based on TE
20
mode using waveguide structure. By taking advantage of the isolation provided by TE
20
mode itself, the power combining network is designed based on TE
20
mode, achieving isolation between ports in the first combining stage without introducing matching loads, thus enabling high efficiency combining. A four-way Ka-band power combining network is designed using a ridge waveguide planar wall waveguide magic T, an improved TE
10
-TE
20
mode converter based on vertical excitation, a waveguide-microstrip double-probe transition structure based on TE20 mode, and an H-plane to E-plane waveguide transition structure. The back-to-back passive network is processed and tested, achieving a combining efficiency of over 80% and a port return loss of better than -15dB in the frequency range of 29-36.5GHz, with a loss of about 0.5dB for the back-to-back network.