UHF/SHF circuits, mostly electron tube circuits, frequencies from around 1 GHz (1000 MHz) to 30+ GHz.
Although it's possible to use cavity resonators at lower frequencies, they become very large, and their theoretical efficiencies are not so much better than conventional circuits that the cost/size can be justified.
Electron tube devices are being replaced by solid-state devices for all but very high powers, such as radar, deep space tracking and nuclear research.
A resonator is a device that produces resonance. They are used to generate waves of specific frequencies. Say for example the musical instruments, cavity resonator (electromagnetic), cavity magnetron, the klystron. There is what we call mechanical resonators used in electronic circuits.
Resonators in your body are located in your head neck and chest cavity, oral nasal and phearyngeal cavities.
E. Argence has written: 'Theory of waveguides and cavity resonators'
When a transverse electromagnetic wave encounters a cavity, it can excite resonant modes within the cavity. These modes are determined by the dimensions of the cavity and can produce standing waves with distinct frequencies. This can lead to the selective transmission or absorption of certain frequencies of the electromagnetic wave within the cavity.
The tubes are used as resonators.
Eric J. Vanzura has written: 'The NIST 60-millimeter diameter cylindrical cavity resonator' -- subject(s): Evaluation, Equipment and supplies, Cavity resonators, Dielectric measurements
the cathode controls the number of electrons in the electron beam and focuses the beam. The voltage between the cathode and the cavity resonators (the buncher and the catcher, which serve as reservoirs of electromagnetic oscillations) is the accelerating potential and is commonly referred to as the beam voltage. This voltage accelerates the DC electron beam to a high...by ali raza khan.Badal
light waves or electromagnetic waves are transverse and sound waves are longitudinal
Google: "Parametric Excitation in Frequency Resonators".
Open pipe resonators are hollow tubes that are open at both ends. They have the characteristic of producing standing waves with specific frequencies determined by the length of the tube. These resonators are commonly used in musical instruments such as flutes and organ pipes to produce specific pitches. They are also used in acoustics for sound amplification and noise reduction applications.
The actual structure
The three main vocal resonators are the chest, throat, and head. These resonators amplify and enrich the sound produced by the vocal cords, resulting in a full and dynamic vocal tone. Proper control and coordination of these resonators are key to achieving a strong and resonant voice.