Multistage tunable notch filter for short wave receiving antenna end
By using a multi-stage adjustable notch filter device and a narrowband band-stop filter circuit composed of a variable inductor and capacitor array, the problem of accurately suppressing multiple dispersed narrowband strong interference signals in the prior art is solved, thereby improving the quality and signal-to-noise ratio of shortwave communication.
CN224356101UActive Publication Date: 2026-06-12JIANGSU HAIRUIDA MICROELECTRONICS TECH CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU HAIRUIDA MICROELECTRONICS TECH CO LTD
- Filing Date
- 2025-08-28
- Publication Date
- 2026-06-12
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Figure CN224356101U_ABST
Abstract
This invention discloses a multi-stage adjustable notch filter device for shortwave receiving antennas, comprising an input terminal, an output terminal, several series-connected notch filter units, and a frequency and amplitude measurement module. Each notch filter unit contains a variable inductor array composed of multiple weighted inductors and corresponding switching devices, as well as a similarly structured variable capacitor array. The frequency and amplitude measurement module detects the spectral characteristics of the output signal, providing a basis for adjustment. This invention can accurately and flexibly attenuate strong interference signals at one or more specific frequencies while preserving the entire operating frequency band of the antenna, with minimal impact on the desired signal, thus improving shortwave communication quality and antenna performance in complex electromagnetic environments.
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