Radiation power measurement of conical horn antennas excited by TE_1n /TM_1n modes

The radiation characters of conical horn antennas excited by TE1n /TM1n modes are studied. Measuring the E- and H-plane power density patterns of a horn, one can get the horns radiation power by respectively integrating the two patterns on the spherical surface and taking their average. The effects of the measuring points range and number on the power calculations are discussed, and a data fitting method is presented to reduce the error caused by numbered measuring points. A principle to choose the range and number of the measuring points is given: the range may be 15 dB-beamwidth or 18 dB-beamwidth, and the number is about 15.