By Institute of Electrical and Electronics Engineers. Antenna Standards Committee
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Extra info for IEEE Std.149-1979 Test Procedures for Antennas
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15 dB. 4 Receiving Systems. The receiving subsys- manual and motor-driven tuning. The motor tem used in the a n t e n n a a m p l i t u d e - p a t t e r n control can be used for a mechanical automatic measurement system may be simply a bolo- frequency control and can be designed in such (c) electronically referencing the oscillator to a microwave cavity (the Pound system) [ 181 (d) electronically referencing the frequency to a stable source (automatic frequency control) (e) phase locking the frequency to a stable source (automatic phase control) The particular scheme used depends upon the type of oscillator used.
In this manner the entire rear portion of the chamber, including the critical points such as corners can be evaluated. As previously mentioned, the results of the measurements depend upon the radiation pattern of the probe antenna. One way to avoid this effect is by the use of an isotropic probe antenna. For example, the probe can be a tridipole antenna consisting of three mutually orthogonal dipoles which are designed in such a manner that the antenna pattern is essentially isotropic. Such antennas have been designed which respond equally.
43 IEEE Std 149-1979 ANTENNA-RANGE (a) (b) (4 Fig 21 Power, Field, and Decibel Plots of the Same Antenna Pattern (a) Relative Power Pattern. (b) Relative Field Pattern. (c) Decibel Pattern. 44 IEEE Std 149-1979 INSTRUMENTATION employed for topographic contour maps. Key levels are numerically identified to permit interpretation of the graph. One such system employs different colors to highlight the contours. These approaches usually require the use of computer graphics. tween 100 and 10 percent of the peak value.