unidirectional antenna造句

例句与造句

1. Inmarsat B and F77 ship earth stations require relatively large gyro-stabilized unidirectional antennas; the antenna size of the Inmarsat C is much smaller and is omnidirectional.
2. The University of Illinois Foundation owned Isbell U . S . Patent No . 3, 210, 767, covering " Frequency Independent Unidirectional Antennas, " which were used for transmission and reception of radio and television signals.
3. It's difficult to find unidirectional antenna in a sentence. 用unidirectional antenna造句挺难的