| 摘要 |
PURPOSE:To investigate accurately a frequency characteristic in a short time, by transmitting plural frequency signals from a transmission antenna to an antenna to be measured which is rotated slightly and sweeping a tuning frequency in the antenna to be measured to attain a directivity data. CONSTITUTION:Plural frequency signals f1-fn to be measured are transmitted from a transmission antennas 3 and 3' and are received by an antenna 4 to be measured which is rotated slightly by a rotating device 6. They are inputted to field intensity measurer 5 after receiving by the antenna 4, and the tuning frequency of the measurer 5 is automatically swept for every slight rotation of the antenna 4, and the level signal to be measured of the measurer 5 and the frequency sweep signal output are inputted to a data processor 14. Each time coming frequencies f1-fn and the tuning frequency coincide with each other, the level to be measured is stored in the processor 14, and a data table is generated on a basis of the angle signal of the device 6, and directivity independent of one another of respective frequencies are generated on a display device 15. Thus, the directivity of plural frequencies f1-fn is measured simultaneously by the antenna 4. |
