Typical radiation efficiency is in the order of 40-50 %.
2.
It demonstrated good coupling efficiency and sufficient radiation efficiency.
3.
Antenna efficiency is different from and contrasted with radiation efficiency, which applies to any antenna type.
4.
They can be viewed as a folded dipole deformed into a different shape, and have rather similar characteristics such as a high radiation efficiency.
5.
David Whiteman, who teaches guitar-making at London Guildhall University's department of design and technology, says that the tuning and radiation efficiency are unlikely to be the whole story.
6.
The team then tested the radiation efficiency of the instruments, which is a measure of how effective they are at turning the mechanical energy from plucking a string into sound.
7.
This leads directly to the earlier stated maximum gain relation to a dipole by the definition of gain a G = \ epsilon D where \ epsilon is the antenna radiation efficiency.
8.
In this case a typical radiation efficiency of around 1 % is acceptable because signal paths can be established with 1 Watt of radiated power or less when a transmitter generating 100 Watts is used.
9.
"As far as we know, this is the first attempt to correlate the tuning properties and radiation efficiency of guitars with their subjective musical quality, " the researchers say in the current edition of Applied Acoustics.
10.
Eight umbrella antennas 350 metres high are in use in an array at the German VLF communications facility, operating at about 20 kHz with high radiation efficiency even though they are less than 1 / 40 wavelength high.
मोबाइल