Vacuum Capacitor

Vacuum capacitors are high-frequency components that use vacuum as the dielectric between oxygen-free copper electrodes. The range includes fixed and variable designs for transmitters, high-frequency high-voltage equipment, particle accelerators, dielectric-loss instruments, medical RF devices and induction-heating systems. They handle tuning, coupling, filtering, neutralization and DC isolation where voltage, frequency or RF current is beyond the practical range of many conventional dielectric capacitors.

Fixed and variable options from one vacuum-dielectric range

The current drawings include a 100 ± 5 pF fixed model and a variable model that tunes from below 15 pF to 500 ± 25 pF. The fixed unit suits preset coupling or blocking positions, while the variable unit covers tuning and impedance matching.

Up to 25 kV working voltage

The fixed model provides 25 kV high-frequency peak working voltage and 35 kV peak test voltage; the variable model provides 10 kV working and 15 kV test voltage. This gives separate voltage classes for fixed and adjustable circuit positions.

87 to 100 A RF current at 13.56 MHz

The listed models carry 87 to 100 A maximum RF current at 13.56 MHz. In RF transmitters and induction-heating systems, current rating can therefore be checked directly alongside capacitance and voltage during model selection.

Both fixed and variable vacuum capacitors use a sealed ceramic-and-metal enclosure, a vacuum cavity, oxygen-free copper electrodes and external terminals. Precision-formed electrode strips are arranged as concentric cylinders to establish the active area and gap.

In a fixed model, the electrode relationship is locked during assembly. A variable model adds moving electrodes, an adjustment mechanism and a motion seal. Because of those differences, the two types follow separate assembly routes even though they use the same dielectric principle.

Fixed or adjustable configuration

A project can use a fixed capacitance or a defined minimum-to-maximum adjustment range. Voltage, RF current, frequency and cooling requirements are matched to the electrode system for the chosen configuration.

Replacement and equipment-fit development

External size, terminals, mounting interface and adjustment connection can be matched to an existing equipment position. Development may start from a technical drawing, the current supplier's model or a physical sample.

Model-specific vacuum assembly

Ceramic parts, electrode groups, terminals and adjustment components are prepared for the complete model. Similar housings are not processed as one item when the internal electrodes or installation interface are different.

Checks matched to the product type

Fixed capacitors are checked for capacitance, insulation and voltage withstand. Variable models also undergo range, continuity and mechanical-operation checks. The product and its test record must match the order specification before the batch is released.

Fixed and variable capacitor production

Wanping makes both fixed and variable vacuum capacitors within an electro-vacuum production system that also handles related sealed high-voltage devices. The factory operates 12 vacuum furnaces and eight post-assembly processing systems.

Repeat supply by confirmed model

Repeat production is controlled by the full model, internal structure and approved specification. This is important for replacement work because two capacitors with similar outer shapes may use different electrodes, ceramic dimensions or terminals.

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