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K8-42. 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 minutes.

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.

K. Electromagnetic Principles

K. Electromagnetic Principles

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