Cognitive Consequences of Communication by Chiu Krauss Lau

By Chiu Krauss Lau

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The radar cross-section s of an object is de®ned as the area intercepting that amount of power that, when scattered isotropically, produces at the receiver a power density that is equal to that scattered by the actual target. Hence, Radar cross-section ˆ Scattered power sq: m Incident power density or, sˆ 4pr2 wr winc …2:4:26† where wr is isotropically back-scattered power density at a distance r and winc is power density incident on the object. Hence, the radar cross-section of an object is its effective area that intercepts an incident power density winc and gives an isotropically scattered power of 4pr2 wr for a back-scattered power density.

The total angle about the main peak over which power reduces by 50 percent of its maximum value is called the half-power beam width on that plane. 4 Radiation pattern of a dipole in the vertical (y) plane. 65); and l is the signal wavelength in meters. 1: Calculate the power gain (in dB) and the half-power beam width of a parabolic dish antenna of 30 m in diameter that is radiating at 4 GHz. 6, the antenna gain and the half-power beam width are found as follows: 4p  706:8584  0:6 ˆ 947482:09 ˆ 10 log10 …947482:09† …0:075†2 ˆ 59:76 % 60 dB Gˆ BW ˆ 65  0:075 ˆ 0:1625 deg: 30 Antenna Ef®ciency If an antenna is not matched with its feeder then a part of the signal available from the source is re¯ected back.

Radiation Patterns and Half-Power Beam Width (HPBW) Far-®eld power distribution at a distance r from the antenna depends upon the spatial coordinates y and f. Graphical representations of these distributions on the orthogonal plane (y-plane or f-plane) at a constant distance r from the antenna are called its radiation patterns. 4 illustrates the radiation pattern of the vertical dipole antenna with y. Its f-plane pattern can be found after rotating it about the vertical axis. Thus, a three-dimensional picture of the radiation pattern of a dipole is doughnut shaped.

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