例句與造句

1. The feedpoint impedance of a dipole antenna is very sensitive to its electrical length.
2. Unfortunately this exercise tells us nothing about the reactive ( imaginary ) component of feedpoint impedance, whose calculation is considered below.
3. The folded dipole is similar to the simple half-wave dipole but with the feedpoint impedance multiplied by 4, thus closely matching that 300 ? impedance.
4. If ohmic losses in the conductors are neglected, the radiation resistance ( considered relative to the feedpoint ) is identical to the resistive ( real ) component of the feedpoint impedance.
5. But as the antenna height is increased, the reduced power of the reflected wave ( due to the inverse square law ) allows the antenna to approach its asymptotic feedpoint impedance given by theory.
6. It's difficult to find feedpoint impedance in a sentence. 用feedpoint impedance造句挺難的
7. Similarly, the feedpoint impedance of a monopole antenna longer than " ? " / 4 ( or a dipole with arms longer than " ? " / 4 ) will include inductive reactance.
8. Although an antenna may be designed to have a purely resistive feedpoint impedance ( such as a dipole 97 % of a half wavelength long ) this might not be exactly true at the frequency that it is eventually used at.
9. If the antenna is shorter than a quarter wavelength, the feedpoint impedance will include capacitive reactance; this causes reflections on the feedline and a mismatch at the transmitter or receiver, even if the resistive component of the impedance is correct.