A compact low-cross-polarization horn antenna with serpentine-shaped taper

We propose a method to realize a novel multiple-mode conical-horn antenna. This antenna has a serpentine-shaped taper, which is quite effective to make the horn antenna compact in size and to realize a low cross polarization. Comparison between our horn antenna and the conventional ones is presented. We discus experimentally the test antennas of the X and U bands.