electrically short造句
例句與造句
- Electrically short antenna systems have relatively small apertures and high losses.
- Electrically short monopole antennas have low resistance and high reactance.
- The electromagnetic field in the near-field region of an electrically short rod antenna is predominantly electric.
- Since the transverse dimension of the array is electrically short, the structure is backed by a long metallic trough.
- So to make an electrically short antenna resonant, an inductor called a loading coil is inserted in series with the antenna.
- It's difficult to find electrically short in a sentence. 用electrically short造句挺難的
- An antenna which is shorter than its resonant length is described as " " electrically short " ", and exhibits capacitive reactance.
- Using a folded unipole will increase the bandwidth of electrically short antennas because its feed-point comprises less reactance that needs to be tuned out.
- The experimental results demonstrated focusing of an incident cylindrical wave within an octave bandwidth and over an electrically short area; suggestive of near-field focusing.
- Electrically short antennas like the rubber ducky are used in portable handheld radio equipment at scanners and other devices where safety and robustness take precedence over antenna capabilities.
- Because of the large wavelength of the radio waves, feasible antennas used at these frequencies are electrically short, their length is a small fraction of the wavelength.
- Lower power transmitters often use electrically short quarter wave monopoles such as inverted-L or T antennas, which are brought into resonance with a loading coil at their base.
- They are used as transmitting antennas below 1 MHz, in the electrically short antenna, and by itself would have very low radiation resistance and be a very inefficient radiator.
- Although like other electrically short antennas the rubber ducky has poorer performance ( less gain ) than a quarter-wave whip, it has somewhat better performance than an equal length base loaded antenna.
- A major practical drawback to this band is that because of the length of the waves, full size resonant antennas ( half wave dipole or electrically short, a small fraction of a wavelength long.
- The power radiated ( or received ) by an electrically short vertical antenna like the T is proportional to the square of the " effective height " of the antenna, so the antenna should be made as high as possible.
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