Stator Plates: Capacitance range 5-500 pF

Component Specifications

Definition

Stator plates are fixed conductive elements in variable capacitors that form one set of electrodes in a parallel-plate capacitor configuration. They remain stationary while rotor plates rotate to vary the effective overlapping area, thereby changing capacitance. These plates are precisely manufactured to maintain consistent spacing and surface quality for stable electrical performance across the adjustment range.

Working Principle

Stator plates work as stationary electrodes in a variable capacitor system. When rotor plates rotate relative to stator plates, the overlapping area changes, altering capacitance according to C = εA/d, where ε is permittivity, A is overlap area, and d is plate separation. This allows precise tuning of resonant circuits in RF applications.

Materials

High-conductivity oxygen-free copper (C10100/C10200) or aluminum alloy (6061-T6) with silver or gold plating for corrosion resistance. Dielectric spacers typically use ceramic (alumina) or high-grade plastics (PTFE/PEEK).

Technical Parameters

Parameter	Typical range	Notes & selection driver
Plate Thickness	0.3-1.2 mm
Surface Flatness	≤0.05 mm/m
Capacitance Range	5-500 pF
Operating Voltage	100-1000 VDC
Surface Roughness	Ra ≤ 0.8 μm
Electrical Conductivity	≥95% IACS (copper)
Temperature Coefficient	≤50 ppm/°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 60384-1, MIL-C-14409D, ISO 286-2

Parent Products

This component is used in the following industrial products

Variable Capacitor

A capacitor whose capacitance can be intentionally and repeatedly changed mechanically or electronically.

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Engineering Analysis

Risks & Mitigation

Dielectric breakdown at high voltages
Corrosion reducing conductivity
Mechanical deformation affecting spacing
Contact wear in sliding configurations
Thermal expansion mismatches

FMEA Triads

Trigger: Insufficient plating thickness
Failure: Corrosion and increased contact resistance
Mitigation: Specify minimum plating thickness (≥2μm gold or ≥5μm silver) and implement regular coating thickness verification

Trigger: Improper material selection
Failure: Thermal expansion mismatch causing spacing variation
Mitigation: Use materials with matched thermal expansion coefficients and implement thermal cycling tests

Trigger: Manufacturing debris between plates
Failure: Short circuits or inconsistent capacitance
Mitigation: Implement cleanroom assembly procedures and automated optical inspection

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Plate spacing tolerance ±0.02 mm, parallelism ≤0.01 mm, surface flatness ≤0.05 mm/m

Test Method

Capacitance measurement per IEC 60384-1, dielectric withstand test at 2x rated voltage, contact resistance measurement using 4-wire method

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Stator Plates

Manufacturer profiles associated with Stator Plates.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between stator plates and rotor plates in variable capacitors?

Stator plates are fixed stationary plates, while rotor plates are mounted on a shaft and rotate to change overlap area with stator plates, thereby varying capacitance.

Why are stator plates typically made of copper or aluminum?

Copper and aluminum offer excellent electrical conductivity, good machinability, and reasonable cost. Copper provides better conductivity while aluminum offers lighter weight.

How do manufacturing tolerances affect stator plate performance?

Tight tolerances on plate flatness, parallelism, and spacing ensure consistent capacitance values, minimize parasitic effects, and provide smooth tuning characteristics across the adjustment range.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Stator Plates