Waveguide antenna magnetoelectric matching transition

An antenna, comprising:

• a waveguide formed by a first horizontal conductive layer of a multi-layer circuit board, a second horizontal conductive layer of the multi-layer circuit board and vertical sidewalls formed by conductive vias extending between the first conductive layer and the second conductive layer,
• a parallel plate resonator at one end of the waveguide, the parallel plate resonator being formed in the multi-layer circuit board by a first horizontal conductive plate adjacent to the first conductive layer and a second horizontal conductive plate adjacent to the second conductive layer;
• a first conductive via having a first vertical height and extending from the first conductive plate towards the second conductive plate;
• and
• a second conductive via having a second vertical height and extending from the second conductive plate towards the first conductive plate;
• wherein
• the first vertical height and the second vertical height are less than a vertical distance between the first conductive plate and the second conductive plate, and the first conductive via and the second conductive via are formed according to an arrangement that is rotationally symmetric with respect to a central axis (CA) of the waveguide.