Broadband fixed-frequency band-pass and adjustable narrowband band-stop dual-function filter

• Main Authors: YAN ZHIGANG, XIAO LIKANG, SHI MAMIN, MU JIRU, ZHANG PINGCHUAN
• Format: Patent
• Language: Chinese; English
• Published: 14.06.2024
• Subjects: BASIC ELECTRONIC CIRCUITRY; ELECTRICITY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS

The invention discloses a broadband fixed-frequency band-pass and adjustable narrow-band band-stop dual-function filter, which belongs to the technical field of electronic devices, and is characterized in that a circuit of the dual-function filter is composed of a plurality of capacitors C, n inductors L, n ferrite balls Q and an external magnetic field H0; one filter can realize two filter functions, the single insertion loss is the insertion loss of an LC wide instantaneous bandwidth filter, compared with a traditional filter, the loss of a magnetic tuning filter is reduced, meanwhile, the size is relatively reduced, and the application design can be simplified; the low-noise amplifier is suitable for being applied to the low-noise amplifier front end of a wide-instantaneous-bandwidth receiver, and due to the fact that insertion loss is small, the problem of low-noise amplification signal saturation can be effectively solved on the premise that the noise coefficient of a receiving link is not deteriorated.