Transverse electric or quasi-transverse electric mode to waveguide mode transformer

摘要

A transverse electric or quasi-transverse electric mode to rectangular mode transformer (100) converts an electrical signal propagating in a transmission line from the TEM or quasi-TEM transmission mode to a rectangular wave transmission mode for propagating in a waveguide. The transformer (100) comprises a trace (14) printed on a substrate, having first (2) and second major surfaces and first (4), second (5), third (6), and fourth (7) minor surfaces. The transformer (100) is logically divided into a quasi-TEM mode portion (8), a conversion portion (9) and a waveguide mode portion (10). The quasi-TEM mode portion (8) comprises a length of microstrip (11). The microstrip widens to a conversion trace (14) in the conversion portion (9) where there is one or more converting fins (15) oriented perpendicularly to the direction of signal propagation. The conversion portion (9) comprises metallized first (2) and second major surfaces and third (4) and fourth (7) minor surfaces. The fins direct the quasi-TEM energy into waveguide mode energy in the substrate for propagation through the substrate. IMAGE