As a core device for long-distance communication, emergency broadcasting, and maritime communication, the shortwave transmitter has signal stability and purity that directly determine communication quality. However, during operation, the transmitter generates substantial high-frequency noise internally and is highly susceptible to external electromagnetic interference. These interferences not only cause transmitted signal distortion and excessive harmonics, but also impair the service life of core components and even trigger equipment failures. With core advantages of high-efficiency filtering, high temperature resistance, and strong impact resistance, feedthrough capacitors have become key components for filtering high-frequency noise and suppressing electromagnetic interference in shortwave transmitters, comprehensively ensuring the stable and reliable operation of the equipment.

        In the core circuits of shortwave transmitters, the application of feedthrough capacitors focuses on key interference protection nodes: targeting electron tubes, the core components, feedthrough capacitors are precisely installed on the DC high-voltage power supply lines of each electrode. Equipped with exclusive feedthrough filtering design, they can effectively block high-frequency interference signals in the lines, prevent such signals from invading the interior of electron tubes and affecting their normal operation, and ensure the stable performance of electron tubes in amplification and oscillation. Meanwhile, these capacitors feature excellent high-voltage withstanding performance, which enables them to adapt to the high-voltage working environment of transmitters and effectively prevent high-voltage breakdown risks.

        Particularly in scenarios involving high-power shortwave transmitters such as 100kW models, LCA® feedthrough capacitors demonstrate superior adaptability: they can rapidly absorb and dissipate transient high-frequency oscillation energy generated during operation, and control temperature rise (≤20℃) via a high-efficiency heat dissipation structure, fundamentally avoiding thermal breakdown of capacitors caused by abnormal temperature rise and ensuring continuous stable operation under high-power working conditions. In addition, in the high pre-stage tuning network and high final-stage neutralization circuit, they play a key role in “harmonic conduction”, providing a safe discharge path for high-order harmonics generated during operation. This prevents circuit resonance interference caused by harmonic superposition, ensures precise frequency tuning and stable output power of the transmitter, and builds a solid technical defense line for high-quality long-distance shortwave communication.