2.4G干扰(国外英文资料).doc

2.4G干扰(国外英文资料) 2.4 G is 30 to 60 times higher than 40/70m. According to the principle of wavelength frequency = x the speed of light, the wavelength of 2.4 G (about 0.12 meters) is 40/70 m wavelength (about 4.2 to 7.5 meters, shortwave, is our common a fraction of a shortwave radio wavelengths) of one of the 30 to 60 minutes. The diffraction ability is weak. This band is a microwave band. The microwave is transmitted in a straight line because of the weak diffraction capability. There cant be anything that can block radio waves in the middle. As long as there is between can block the radio waves, such as sheet metal (aluminum box body sheet metal, metal conductor shielding material is a good radio waves), signal strength will be greatly reduced. Because of the interference of radio waves, microwave wavelengths are short. Even without obscured, so close to the metal object may also be because the metal plate the reflected radio twists and turns back, with the launch of the radio waves interference (after superposition signal enhancement in some places, some less) and cause the loss of signal intensity. And like the leaves of large-area natural biological or blocking effect of microwave also have certain objects (no metal so strong, but still have, in addition because the leaves are shaking, so the interference may be irregular, intermittent). So if where there is surrounded by trees play plane (suburb surrounded by road and mountain forest site, road generally have shelter belt), 2.4 G control is best not to let the plane fly out of the distant woods outside (the forest cover in a short period of time, according to keep out in front of the pilot course, speed, and the calculation of flight time (in) to ensure that the plane not bump a tree and bypass the tree linfei back). Because 2.4 G of attenuation is bigger, so out of control probability higher (not necessarily out of control, because if the function of the transmitter is larger, can overcome the attenuation, al