A cavity resonator, also known as a resonant cavity or microwave cavity, is an enclosed structure used to resonate electromagnetic waves at a specific frequency. It consists of a hollow, metallic or dielectric cavity with conductive walls that reflect the electromagnetic waves back into the cavity to create standing waves. The cavity resonator is used in many applications, including filters, oscillators, and amplifiers in microwave and radio frequency systems.
The resonant frequency of a cavity resonator depends on its dimensions and the speed of light in the cavity. The cavity can be designed to resonate at a particular frequency by adjusting its dimensions and shape. The resonant frequency is typically tuned by changing the length or shape of the cavity or by inserting a tuning element, such as a probe or a dielectric material, into the cavity.
Cavity resonators can be classified into two types: TE and TM modes. In TE modes, the electric field is perpendicular to the direction of propagation, while in TM modes, the magnetic field is perpendicular to the direction of propagation. The resonant frequency of the cavity depends on the mode of operation and the size and shape of the cavity.
Cavity resonators are commonly used in microwave and radio frequency applications due to their high Q factor (quality factor) and narrow bandwidth, which allows for high selectivity and sensitivity. They are used in many applications, including filters, oscillators, and amplifiers in wireless communication systems, radar systems, Learning Management System, and microwave ovens.