A debugger for Tcl applications - download pdf or read online

By Libes D.

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18. AN INTRODUCTION TO ANTENNAS Approximate equivalent circuit for transmitting and receiving antenna system. We may consider Z l l the input impedance of the transmitting antenna, 1, neglecting the effects of the receiving antenna on the transmitting antenna, an excellent approximation for widely separated antennas. Likewise Z22 would be the input impedance of antenna 2 if it were transmitting. If we call ZII and Z22 the self-impedances of the antennas, we see that the self-impedance of an antenna is the same with the antenna transmitting and receiving.

163) where Voc and E are taken as peak values. ,\2 47T This ratio was obtained for a lossless example , but as we saw earlier it also holds for the lossy case. 15. 168) TRANSMISSION BETWEEN ANTENNAS We have at this point defined the necessary terms and developed the equations that allow us to determine the power in a receiver load if the power accepted by the transmitting antenna is known. Let the power accepted by antenna 1 in Fig. 20 be Wat . If antenna 1 radiated isotropically, the power density at 2 would be Since antenna 1 does not radiate isotropically, but has gain G t , the actual power density at 2 is WatGt(O" ¬Ęt) 47TR2 where we use t to indicate a transmitting antenna.

In considering the dipole antenna it is reasonable to consider feeding it with a two-wire transmission line with TEM mode fields. Now the concept of an antenna impedance is clearly dependent on our defining a driving point, or input port, for the antenna. Silver [15] points out that the current distribution in the line must be that characteristic of a transmission line up to the assigned driving point. At higher frequencies, interaction between the radiating system and the line may disturb the line currents back over a considerable distance, and there is no definite transition between transmission line currents and antenna currents.

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A debugger for Tcl applications by Libes D.


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