Radiowaves - Energy And Dipole Pattern

Purpose

To demonstrate that energy is transmitted in electromagnetic waves and to show the radiation pattern of the dipole antenna. ◙
 

Equipment

Radiowave transmitter and dipole antenna with light bulb indicator.

 

Setup Time

5 min.
 

    Images

    k8-42

    Description

    The receiving antenna can be moved around in space, keeping the two antennas parallel, to observe the dipole radiation pattern. Rotating the receiving antenna to a vertical orientation shows that the radiowaves are polarized.
     

    References

    H. P. Stabler, Apparatus Notes: Pulses on a Transmission Line with a Tektronix 545A Oscilloscope, AJP 29 #2, ix-x (1961). Ronald I. Rank, Speed of a Pulse in a Transmission Line, TPT 7, 344-345 (1969). ◙D. J. Martin, Wave propagation in dispersive and attenuation media: A delay line simulation of plasma waves, AJP 48, 473-477 (1980). ◙Operating Instructions, Short Wave Radio Demonstration Apparatus, Cenco No. 080435, Cenco Scientific Co., Chicago, IL. Lecture Demonstration Photographs and description of Demonstration.