| 摘要 |
PURPOSE:To enable to pick up the antenna output without using high frequency cables, by coupling the electric light emitting elements such as LED to the high frequency output terminals of the antenna element. CONSTITUTION:To the power feeding terminal 11(high frequency output terminal) of the antenna element 10 of the loop antenna, the element changing the amount of light emission in response to the applied voltage such as electronic light emitting element 12(LED and semiconductor laser element) is coupled. Further, to the input terminal 13 of the element 12, the DC voltage from the power supply 13 through the RF choke 14 and the high frequency output voltage caused at the terminal 11 are superimposingly fed (the capacitor 18 is for DC blocking) and the output light appeared at the optical output terminal 16 of the element 12 is led to the photo receiver through the optical lay path 17 such as glass fiber. Thus, the output light of the element 12 is changed according to the signal voltage of the element 10, then by observing the light fed from the optical ray path 17, the antenna output not requirring high frequency cables can be established. |
