By Alva Herschel Bennett
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Extra resources for Phase Microscopy: Principles and Applications
Example text
HPBW can also be defined in the elevation plane, and for our example it has no meaning because there is no change in power density in the y-z plane. 35 Chapter 2 Side Lobe Level If the pattern in a particular plane has more than a front lobe and a back lobe, the other lobes are called side lobes. The maximum side lobe level (SLL), relative to the main lobe, is sometimes of interest. Aside from these feature-based parameters, there is a more basic measure of directionality called directivity. 2.
3). 2 Given a current of 1A flowing on a wire of length 1 m having a frequency of 1 MHz, what is the magnitude of the E and H fields at 10 km? 2 lies on the x axis. At an observation point 10 km out on the y axis, what are the x,y,z components of the E and H fields? 3, suppose the observation point is at r = 10 km, G = /3 and in the x,y plane. Find the G,R components of E and H. 6) for the H fields. Assume that for water r = 81. For a wave in air with Ei = 1 mV/m, normally incident on a flat water surface, find all the other E and H wave fields, and the total E and H fields at the boundary.
5W. This checks with Pf – Pr = PL. 5 75V and V– = V+/3 = 25V. At the load, these amplitudes subtract to give the needed 50, and at the transmitter end, they add to give 100V. Is this correct? The input power is Pin Vin2 2 Rin 104/(2 × 50) = 100W, as required. We can trace this through in a slightly different and more general way. Since 2Q M Q , the forward-wave voltage at the load is V (d ) V e jQ / 2 jV . Cd f M 4 2 Likewise, the reverse-wave voltage is Vr(d) = jV –. Since the reflection coefficient is –1/3, jV – = (–jV +)(–1/3) or V – = V +/3.