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  2. Microwave oven - Wikipedia

    en.wikipedia.org/wiki/Microwave_oven

    A microwave oven or simply microwave is an electric oven that heats and cooks food by exposing it to electromagnetic radiation in the microwave frequency range. [1] This induces polar molecules in the food to rotate and produce thermal energy (heat) in a process known as dielectric heating .

  3. RF and microwave filter - Wikipedia

    en.wikipedia.org/wiki/RF_and_microwave_filter

    Physical length of conventional cavity filters can vary from over 205 cm in the 40 MHz range, down to under 27.5 cm in the 900 MHz range. In the microwave range (1000 MHz and up), cavity filters become more practical in terms of size and a significantly higher quality factor than lumped element resonators and filters.

  4. Microwave cavity - Wikipedia

    en.wikipedia.org/wiki/Microwave_cavity

    A microwave cavity or radio frequency cavity (RF cavity) is a special type of resonator, consisting of a closed (or largely closed) metal structure that confines electromagnetic fields in the microwave or RF region of the spectrum. The structure is either hollow or filled with dielectric material. The microwaves bounce back and forth between ...

  5. Cavity magnetron - Wikipedia

    en.wikipedia.org/wiki/Cavity_magnetron

    The cavity magnetron is a high-power vacuum tube used in early radar systems and subsequently in microwave ovens and in linear particle accelerators. A cavity magnetron generates microwaves using the interaction of a stream of electrons with a magnetic field, while moving past a series of cavity resonators, which are small, open cavities in a ...

  6. LG improves its wearable air purifier with a built-in ... - AOL

    www.aol.com/news/lg-wearable-air-purifier-mic...

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  7. Covert listening device - Wikipedia

    en.wikipedia.org/wiki/Covert_listening_device

    The cavity had a metallic diaphragm that moved in unison with sound waves from a conversation in the room. When illuminated by a radio beam from a remote location, the cavity would return a frequency modulated signal. The United States Embassy in Moscow was bugged during its construction in the 1970s by Soviet agents posing as laborers. When ...