| 21. | The actual time-reference of an atomic clock consists of an electronic oscillator operating at microwave frequency.
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| 22. | The first experimental confirmation of negative index of refraction occurred soon after, also at microwave frequencies.
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| 23. | Three additional ISM bands exist in the microwave frequencies, but are not used for microwave cooking.
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| 24. | It is therefore applicable at microwave frequencies just as much as it is at lower frequencies.
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| 25. | Vacuum-tube detectors do not work at microwave frequencies.
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| 26. | Dual TL structures have been used to experimentally demonstrate backward-wave radiation and focusing at microwave frequencies.
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| 27. | This instrument makes use of the reflection phenomenon to make many different measurements at microwave frequencies.
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| 28. | Traveling wave tube amplifiers ( TWTAs ) are used for high power amplification at low microwave frequencies.
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| 29. | Packages for microwave frequency devices are arranged to have minimal parasitic inductance and capacitance in their leads.
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| 30. | Thus at microwave frequencies, most of the current flows in an extremely thin region near the surface.
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