Non magnetic sapphire dielectric trimmer Capacitors

This natural mineral insulator has outstanding dielectric properties that are ideal for long-life high-stability capacitors with low loss at all frequencies, and high dielectric strength. This type of capacitor is used particularly for high frequency and delay line applications, oscillating circuits, emission devices and calibrators.

Mica dielectric capacitor technology allows for several custom design applications including: 

• High voltage capacitors (up to 50 kV)
• High temperature capacitors (up to 250°C)
• Precision capacitors (up to ± 0.1%)
• High stability capacitors (– 20 + 30 ppm/°C)
• High frequency capacitors ( up to several GHz). 

The majority of these capacitors are manufactured to comply to specifications NF-C-83120;MIL-C-5 and MIL-PRF-39001 standards.

Mica capacitors are noted for the following characteristics:

• Temperature performance
• Low loss at all frequencies
• High dielectric strength
• Stability over time

Dielectric Tuning Elements are used whenever the lowest loss tuning for high frequency applications is required. When dielectric rod is introduced into a cavity, the self resonant frequency is lowered due to the cavity “appearing” larger. 

 The basic dielectrics used in Exxelia Ceramics Microwave Tuning Elements are sapphire, quartz and alumina. 

A trimmer capacitor is a variable capacitor designed for precise adjustment of capacitance in electronic circuits. It is typically used in RF applications such as oscillators, filters, impedance matching, and crystal trimming, where fine tuning is required to optimize performance.

Exxelia trimmer capacitors offer high stability over time, low temperature coefficient, and minimal capacitance drift. They also feature a high Q factor, ensuring low energy losses and excellent performance in high-frequency applications. Many models include multi-turn adjustment for high resolution tuning and a self-locking mechanism for reliable settings.

Exxelia offers a wide range of trimmer capacitors, including air dielectric, sapphire dielectric (GHz range), non-magnetic versions, high-voltage models, and SMD chip trimmers. These different technologies are designed to meet various requirements such as high frequency performance, compact integration, or operation in harsh and sensitive environments.

Depending on the series, Exxelia trimmer capacitors can operate at frequencies up to several GHz and support working voltages from 250 VDC up to 5000 VDC. Sapphire-based models provide very high self-resonant frequency and excellent Q performance, making them suitable for demanding RF and microwave applications.

Yes, many Exxelia trimmer capacitors are designed to withstand harsh conditions, including vibration, shock, and extreme temperatures (typically from -55°C to +125°C). Non-magnetic versions are available for applications such as MRI and other sensitive environments, while hermetic and sealed models provide resistance to moisture, dust, and cleaning processes.