| 单词 | directional antenna |
| 释义 | directional antenna (once / 454589 pages) n WORD FAMILY directional antenna: directional antennas USAGE EXAMPLESOn that Saturday, club members were erecting a directional antenna at SERMA, as well as a line antenna. Washington Times(Jul 09, 2016) Trained emergency response teams would go to the wanderer’s area and use a directional antenna tracking device to connect with the individual’s specific frequency. Washington Times(Nov 20, 2014) Directional antennas went haywire when helicopters changed direction suddenly, as helicopters sometimes do. New York Times(Dec 10, 2012) n an antenna that transmits or receives signals only in a narrow angle Hypo|Hyper array an arrangement of aerials spaced to give desired directional characteristics dish, dish aerial, dish antenna, saucerdirectional antenna consisting of a parabolic reflector for microwave or radio frequency radiation Yagi aerial, yagia sharply directional antenna scannera radar dish that rotates or oscillates in order to scan a broad area aerial, antenna, transmitting aerial an electrical device that sends or receives radio or television signals |
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