Dual-Ridged Horn Antenna design for both radiated immunity and emissions test of broadband applications in EMI measurement.?This antenna can use for calibration systems, and antenna test systems can be applied to reflective antenna feeds and can also support a variety of mobile communications. This type of antenna can be applied to the radar of satellites, can be used in the fifth generation of mobile communication systems, transmit more packets, pictures, videos, and files, and can also be used in mobile satellite communications to improve the quality of communications. The OBH-180400 Dual-Ridged Horn Antenna operates within the 18GHz to 40GHz frequency range. In this case, it covers the Ka-band. The optimized antenna aperture dimension of a flared section of the pyramidal structure and improved ridge profile yielded the wide antenna beam-width across the bandwidth, lower VSWR, stable gain, and symmetric radiation patterns with low side lobe level. The gain increases with frequency up to approx.15 dBi, depending on the horn's size and shape. The antenna supports Single Linear polarized waveforms. Additionally, the OBH-180400 weighs only 250g, is lighter than two apples, and comes with a box for easy portability and testing. In each round, it has good gain and polarized VSWR. There is a VSWR of less than 2.0 over the entire standing wave bandwidth. We can also provide accurate test data, including antenna direction coefficients, Gain, VSWR, and directions, and input antenna coefficients into your system to test it.