Experimental report 5: Investigation of transmission of electromagnetic wave (microwave) môn Vật lý đại cương 2 | Học viện Công Nghệ Bưu Chính Viễn Thông

Experimental Report 5:
INVESTIGATION OF TRANSMISSION OF ELECTROMAGNETIC WAVE (MICROWAVE)
Verification of the instructors Group: 04 Name: Nguyễn Nhật Minh Student ID: 20224347 A. Experimental Results
1. Investigation of straight-line propagation of microwaves
- The volt-meter shows the maximum value when the receiver place straight to the transmitter
- The value decrease as the reciever move far away
Conclusion: Its obtain max value in straight line.
2. Investigation of penetration of microwaves
- There is a decreseation in the voltmeter when putting the dry plate between the reciever an transmitter
Conclusion: Microwave can go through dry plate but it will be dcreased
3. Investigation of screening and absorption of microwaves
- When putting a reflection plate down, the volt meter show a very small value
Conclusion: Most of the wave can’t go through reflection plate
4. Investigation of reflection of microwaves Reflector angle ( ) o Voltage (mV) 40 520 50 660 60 1070
Conclusion: The bigger the angle the higher the voltage
5. Investigation of refraction of microwaves
- The data of vol-meter is highest when it’s at the angle of 95
6. Investigation of diffraction of microwaves
- The volt-meter increase when putting the single plate on the rail
- When the microwave move side to side, the value change
Conclusion: Microwave have diffraction properties
7. Investigation of interference of microwaves
The value on the volt meter is flactuate when moving the micro probe close to the plate
Conclusion: Microwave has interference properties
8. Investigation of polarization of microwaves
- The value on the volt-meter is decreasing when putting the gratting horizontally and
approximately zero as its placing vertically
- When the gratting is aligned at 45 degree, the value is higher than vertical case but lower th horizontal case Value Horizontal Vertical 45 degree Very small Very big Higer than Horizontal ( approximately 0) Lower than Vertical
9. Determining wavelength of standing waves f x1 (mm) x2 (mm) x = x 1 - x2 1 127 146 19 2 128 146 18 3 126 144 18 3 x=13∑ xi=18.3 (mm) i=1 √3∑(xi−x )2 ∆x= i=1 3=0.4 (mm) λ=2×x=2×18.33=36.6 (mm) ∆λ= √(∆x )2=0.4 (mm) Hence λ=λ±∆ λ=36.6±0.4 (mm) Frequency of the microwave: f=c λ=3×108 36×10−3=8.2×109 (Hz ) ∆ f=f √(∆λ )2=0.1×10 λ 9 (Hz )
f=f ±∆f = (8.2±0.1 )×109 (Hz)