radiation resistance वाक्य
उदाहरण वाक्य
मोबाइल
- The radiation resistance of the dipole increases with this spacing, so the spacing can be adjusted to match the driven element to the feed line.
- Consequently, it can be seen that the radiation resistance computed for the short dipole is one quarter of that computed above for the Hertzian dipole.
- As the current is the same, the radiation resistance ( real part of series impedance ) will be half of the series impedance of a half-wave dipole.
- In all these antennas the smaller radiation resistance of the short radiator is increased by the capacitance added by the wires attached to the top of the antenna.
- This led to the consideration of the use of gamma radiation as a food preservative, and Anellis began research on the radiation resistance of bacteria in canned foods.
- This method can be used to compute the radiation resistance for any antenna whose far field radiation pattern has been found in terms of a specific antenna current.
- 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.
- Resonating such an inductor with a capacitor at the frequency of operation not only cancels the reactance but greatly magnifies the very small radiation resistance of such a loop.
- 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.
- Because they are short compared to a wavelength of the radio waves, they have low radiation resistance and are usually inefficient, radiating only a fraction of the power supplied by the transmitter.
- The function of the umbrella-wires is to add capacitance to the top of the antenna, improving the current distribution on the vertical mast radiator to increase the radiation resistance and radiated power.
- It can be seen that, since the radiation resistance is usually very low, the major design problem is to keep the other resistances in the antenna-ground system low to obtain the highest efficiency.
- These have a radiation resistance which is much greater, closer to the characteristic impedances of available transmission lines, and normally much larger than the resistance of the conductors, so that their efficiency approaches 100 %.
- Due to their low radiation resistance they are inefficient, radiating only 10 % to 50 % of the transmitter power at most . with the rest of the power dissipated in the antenna / ground system resistances.
- If the feed point is distance " x " from one end of a half wave ( " ? " / 2 ) dipole, the radiation resistance relative to the feedpoint will be given by the following equation.
- This is fortunate, since antennas at lower frequencies which are not rather large ( a good fraction of a wavelength in size ) are inevitably inefficient ( due to the small radiation resistance R r of small antennas ).
- Small antennas are characterised by low radiation resistance and relatively high reactance, so that a tuning component must be added in series with the antenna to cancel its reactance and assist matching to the circuit to which it is connected.
- The cause of these losses is related to the relatively low radiation resistance of an electrically short radiator with respect to the r-f resistance of the ground system and matching networks, all of which are in series with the antenna current.
- Often the ground plane rods are sloped downward toward the ground, which improves the radiation pattern and increases the normal 36.8 ohm radiation resistance closer to 50 ohms to provide a better impedance match with standard 50 ohm coaxial cable feedline.
- "But another stress _ dehydration _ afflicts Deinococcus radiodurans and also causes massive DNA fragmentation, " and so the " radiation resistance of the bacterium may be a serendipitous result of its ability to repair its DNA after severe dehydration ."
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