Glass capacitors refer to specialised capacitor devices, which are particularly designed with three basic elements; a glass dielectric, aluminium electrodes, and an encapsulation. The glass capacitors are named so because of their typical glass dielectric materials. They are specifically used in RF, or radio-frequency, circuits that demand extreme and ultimate performance.
Due to their higher performance capabilities, glass capacitors can be found in a wide range of applications. They are usually used as specialist components under special conditions. As such their applications include:
Circuits that remain exposed to extreme temperature conditions, for example remote sensors.
Devices that require a high Q circuit, for example oscillators.
Circuits that have low microphone requirements, for example in PLL synthesisers.
Applications that demand high power amplifiers, for example RF power amplifiers.
Importance of glass capacitors
Glass capacitors, possessing a glass body as the dielectric material, are extremely important specialist components of electronic circuits. They not only offer higher levels of performance but also pack in a number of other benefits like low-temperature coefficient, high tolerance, and precision as well.
The capacitance value of glass capacitors is relatively low, varying between a fraction of a picofarad and a thousand picofarads. Their high performance properties make them ideal capacitors for appliances where other capacitors cannot be used. For instance, glass capacitors are extremely important for radio frequency (RF) circuits.