Microstrip to Waveguide Adapter.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The invention provides a direct, in-line, single ground-plane, microstrip-to-waveguide transition method which eliminates the need for a coaxial mode transition. This method makes feasible the use of waveguide structures in microstrip circuitry. The method comprises attaching the single, ground plane of the microstrip to one of the broad-walls of a physically compatible waveguide to be inserted into the microstrip system. The microstrip, narrow conductor is then impedance transformed external to the waveguide and directly attached to the remaining waveguide broadwall. Such a transition can be effected by cutting a hole in the microstrip, setting the waveguide containing the desired circuit component into this hole so that the two lines are end-to-end, and connecting the two lines as stated above. This small, drop-in, waveguide must be heavily loaded in order to allow it to propagate the R.F. energy present in the microstrip line while remaining physically compatible with the stripline.
- Electrical and Electronic Equipment