MICROWAVE OPTICS - Granular Materials Laboratory

Microwave Optics012-04630FExp 2 – ReflectionNotes – on Procedure5Angle of Incidence Angle of Reflection20° 23°30° 31°40° 41°50° 54°60° 63°70° 85°*80° 78°*90° 70°*The last three points are suspect, due to the spread in theoutput pattern of the transmitter. See experiment 1, part 8.Answers – to Questions1 The angle of incidence equals the angle of reflection.This does hold for all angles, although it is not clear inthis experiment due to the spread in the output pattern.2 Some of the wave appeared to reflect into differentangles; particularly when the angle of incidence was70° or 90°. This is actually a diffraction effect, not reflection.3 The transmitter does not produce a perfect plane wave,and this does affect the results.Answers – to Questions for AdditionalExperimentation1 Intensity of the reflection does vary with the angle ofincidence; from this we can deduce that the reflector isnot 100% efficient.2 In general, conductors will reflect the microwavesmuch better than non-conductors.Exp 3– Standing Waves - Measuring WavelengthsNotes – on Procedure➤ NOTE: There are two different methodsdescribed in this lab. The first method, using theMicrowave Detector Probe, is the easier of thetwo; but either will work.Method A# of antinode Distance Wavelength5 7.1 2.8410 14.1 2.8215 20.0 2.6719 27.5 2.89Frequency:Average: 2.811.07E+10Method B# of antinode Distance Wavelength10 13.3 2.6615 20.5 2.73Average: 2.70Frequency:1.11E+10(Fewer points were taken due to the limited resolutionof this method.)Answers – to QuestionsThe value obtained by the first method was 1.5% off,and the second was 5.6% off. If it is possible to takemore data points on the second method, you may getbetter results.36