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Theoretical study of dipole antennas on photonic band-gap materials

✍ Scribed by M. M. Sigalas; R. Biswas; K.-M. Ho

Publisher
John Wiley and Sons
Year
1996
Tongue
English
Weight
529 KB
Volume
13
Category
Article
ISSN
0895-2477

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✦ Synopsis

The average value of 10 trials at 9.175 GHz, AT was found to be 0.08 ns. Similar tests were repeated at selected frequencies between 8.0 and 9.8 GHz, and the results are shown in Figure 7. This amount of error will not alter the observation that the speed of propagation of the leading edge of the pulse at the noise threshold is slower in open air than in a rectangular waveguide.

V. CONCLUSIONS

The experiment presented here demonstrates that the leading edge of pulse-modulated microwaves in a waveguide propagates with a speed greater than open-air speed. The results presented here are isolated from problems such as detector sensitivity and noise level because the measured speed in waveguide is compared to the intrinsic speed of propagation in open air, which is approximately 3 x 10' m/s. Therefore, it has been demonstrated that the signal velocity of pulse-modulated microwaves at the leading edge noise threshold in a waveguide is superluminal.

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