By Birkhoff G.D.

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**Extra info for A Theory of Matter and Electricity**

**Example text**

Studying the effect of CH002 17 April 2014; 14:54:22 26 CHAPTER Wire Dipole and Monopole Antennas 2 FIGURE 2-22 ¢ Setup for wireless power transfer using two dipole antennas. Receiver (Rx) Transmitter (Tx) Z Distance Dipole length X Y Z Y X Friis formula FEKO Friis formula Received power (μW) Received power (μW) 2000 1500 1000 500 0 250 300 Frequency (MHz) (a) FIGURE 2-23 FEKO 100 ¢ 80 60 40 20 0 250 350 (b) 300 Frequency (MHz) 350 Received power at the receiver antenna for various distances: (a) d ¼ l.

0 Z Y X Y X Y Z (a) X (b) Y Z X FIGURE 2-17 ¢ The quarter-wavelength monopole antenna above a finite ground plane: (a) 3D model in FEKO. (b) Contour plot of the current distribution on the ground plane. Frequency = 270 MHz Frequency = 300 MHz Real Frequency = 330 MHz 25 100 Impedance [Ohm] Current [mA] 20 15 10 5 0 0 (a) Imaginary 50 100 150 200 Segment Z-position [mm] 250 (b) 80 60 40 20 0 –20 –40 –60 270 280 290 380 310 Frequency [MHz] 320 330 FIGURE 2-18 ¢ (a) Current distribution on a monopole antenna with a 5 l ground plane.

B) Wire loop model in FEKO. CH003 16 April 2014; 12:4:29 46 CHAPTER 3 Wire Loop Antennas FIGURE 3-4 ¢ Creating a wire port for a loop antenna in CADFEKO. FIGURE 3-5 ¢ Geometry of a loop antenna in CADFEKO. 2 Parametric Studies Using the simulation setup given in the previous section, now let’s examine the radiation characteristics of electrically small loop antennas. We consider two cases here for the circumference of the loop: l/20 and l/10. 0 Z Y X Z (b) X Y Phi = 90 deg 330 300 0 2 0 –2 –4 –6 –8 –10 –12 –14 Phi = 0 deg 30 60 270 90 240 (c) 120 150 210 180 47 FIGURE 3-6 ¢ Radiation performance of a loop antenna in POSTFEKO: (a) Near-field distribution in the y-z plane.