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Film Capacitors

Film capacitors, also known as plastic film capacitors, polyester film capacitors, polypropylene capacitors, polystyrene capacitors, and mylar capacitors, are some of the most common types of capacitors used in consumer electronics today. They consist of two thin layers of metal foil, separated by a dielectric film made of insulating material. The most common of these materials is film, although other materials such as porcelain and paper may also be used.

WMF05W2K Application Field and Working Principle

The WMF05W2K is a miniature, axial-leaded, metallized polypropylene film capacitor developed for use in the radio frequency (RF) and communications fields. It is designed to meet demanding requirements in harsh industrial environments and can be operated at temperatures up to 150°C. The device is ideal for use in applications such as clock generators, pulse generators, pulse shaping and filtering, as well as antenna matching in mobile radios.

The WMF05W2K is a bipolar, low-resistance film capacitor. It works as an insulation medium that prevents leakage current and prevents current from crossing from one metal plate to another. The device\'s low-loss, high-reliability construction makes it suitable for a wide range of RF applications, where very low losses are required. The metal foil layers are composed of a dielectric material that stores a static electric charge when a DC voltage is applied. Since the dielectric material offers a sizable impedance to AC signals, very little current is able to flow through it. Thus, the capacitor works as an effective filter, blocking low-frequency signals and allowing only high-frequency signals to pass.

The device also contains a series of metal electrodes that can generate a magnetic field. This field can be used to focus the RF signal, thereby improving the signal\'s clarity and enabling more precise control over the filter\'s cutoff frequency. The WMF05W2K is a robust device, designed to withstand significant levels of shock and vibration, and its small size allows it to be used in a variety of devices where space is at a premium.

Mounting Requirements and Specifications

The WMF05W2K must be mounted on a flat, non-conductive surface to prevent shorting of the electrodes. The device must also be mounted such that the entire length of the capacitor is horizontally oriented when viewed from a distance. This is to ensure that the magnetic field is not disrupted, which could lead to signal distortion or attenuation. The following mounting requirements and specifications should be followed when installing the device:

• Maximum operating temperature: 150°C
• Operating voltage rating: 0 – 500V AC
• DC absorption current: 5mA
• Dielectric strength: 800 V AC for 1 minute
• Insulation resistance: ≥10 MΩ minimum
• Self-healing capability
• Stable magnetic field performance
• Temperature coefficient of capacitance: ±15% (per °C)
• Surface temperature rise: <40°C

The WMF05W2K is designed to provide reliable, low-loss filtering performance in a range of RF and communications applications. Its miniature size and robust construction make it ideal for use in limited-space environments, such as mobile radios. With its low-resistance, high-reliability construction and excellent dielectric and magnetic field performance, the WMF05W2K provides a high-performance solution for modern RF and communications applications.

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