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Increasing return loss corresponds to lower SWR. Return loss is a measure of how well devices or lines are matched. A match is good if the return loss is high. A high return loss is desirable and results in a lower insertion loss. From a certain perspective 'Return Loss' is a misnomer. The usual function of a transmission line is to convey ...
Automotive aerodynamics is studied using both computer modelling and wind tunnel testing. For the most accurate results from a wind tunnel test, the tunnel is sometimes equipped with a rolling road. This is a movable floor for the working section, which moves at the same speed as the air flow.
STC is due to the corollary of this statement - nearby targets return orders of magnitude more radio signal. In the case of a long-range radar with high power outputs, the return from nearby targets can be so powerful that it causes the amplifiers to saturate, producing a blank area on the screen beyond which nothing can be detected until the ...
One of the first radomes. The radome (top) covers the H2S radar system rotating antenna (bottom) on a Halifax bomber. A radome is often used to prevent ice and freezing rain from accumulating on antennas. In the case of a spinning radar parabolic antenna, the radome also protects the antenna from debris and rotational irregularities due to wind ...
Windage loss is the reduction in efficiency due to windage forces. For example, electric motors are affected by friction between the rotor and air. [1] Large alternators have significant losses due to windage. To reduce losses, hydrogen gas may be used, since it is less dense. [2] There are two causes of windage:
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Wind-powered vehicles derive their power from sails, kites or rotors and ride on wheels—which may be linked to a wind-powered rotor—or runners. Whether powered by sail, kite or rotor, these vehicles share a common trait: As the vehicle increases in speed, the advancing airfoil encounters an increasing apparent wind at an angle of attack ...
Airborne wind energy promises to be a cost-competitive solution to existing renewable energy technologies. [ 18 ] [ 19 ] The main advantages of the airborne wind energy technology are the reduced material usage compared to conventional wind turbines (no foundation, no tower) which allows reaching for higher altitudes and makes the systems more ...