Microstrip to waveguide coupler having a broadened end portion with a non-conductive slot for emitting RF waves
The invention relates to a microstrip coupler for coupling a radio frequency, RF, wave into a waveguide. The microstrip coupler comprises a conductive microstrip line having a broadened end portion, and a non-conductive slot ( 105 ) following the broadened end portion to form an antenna for irradiating the RF wave.
1. A waveguide arrangement, comprising:
a microstrip coupler that includes:
a conductive microstrip line having a broadened end portion, wherein the broadened end portion is tapered;
a non-conductive slot following the broadened end portion to form an antenna for emitting a RF wave; and
a RF waveguide enclosing the non-conductive slot to receive the RF wave, wherein at least a portion of the broadened end portion is not enclosed by the RF waveguide.
2. The waveguide arrangement of claim 1 , wherein the RF waveguide comprises a conductive wall surrounding a dielectric material, and wherein the conductive wall conductively connects to the broadened end portion.
3. The waveguide arrangement of claim 1 , wherein the RF waveguide comprises a conductive wall surrounding a dielectric material, and wherein the non-conductive slot is formed to emit the RF wave towards the dielectric material.
4. The waveguide arrangement of claim 1 , wherein the RF waveguide comprises a stepped portion configured to receive the conductive microstrip line, and an elongated portion that extends perpendicularly from the conductive microstrip line.
5. The waveguide arrangement of claim 1 , wherein the RF waveguide extends in a direction of a normal of the non-conductive slot.