Small-size high-frequency band-pass surface-mounted crystal filter

By designing an embedded discrete structure of slots and mounting grooves on the PCB motherboard, the capacitor plate and crystal plate of a small-volume high-frequency bandpass surface-mount crystal filter can be replaced separately, solving the problems of dependence on imported high-end crystal filters and high maintenance costs of traditional filters, and meeting the requirements of miniaturization and reliability.

CN223364324UActive Publication Date: 2025-09-19SHAANXI HUAJING BEICHUAN ELECTRONIC TECH CO LTD
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Patent Information

Application Number
CN202422412849.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-10-08
Publication Date
2025-09-19
Estimated Expiration
2034-10-08

AI Technical Summary

Technical Problem

Existing high-end high-frequency surface-mount crystal filters rely on imports, with long procurement cycles. In addition, traditional crystal filters are prone to damage to PCB pads during component replacement and welding, increasing production and maintenance costs. At the same time, it is difficult to meet the requirements of miniaturization, chip-type and harsh environmental testing.

Method used

A small-volume high-frequency bandpass surface-mount crystal filter was designed. Slots, mounting slots, and positioning slots were set on the PCB mainboard. Mounting strips and shielding clips were used to realize the embedded discrete structure of the capacitor plate and the crystal plate, allowing the capacitor plate and the crystal plate to be replaced separately. The U-shaped plate and coil were combined for positioning and shielding, reducing the number of component soldering times and meeting the requirements of product miniaturization and reliability.

Benefits of technology

It is achieved that during the rework process, only the capacitor plate and crystal plate need to be replaced, which reduces production and maintenance costs, improves production efficiency, meets the requirements of product miniaturization and reliability in high overload environments, solves the high stopband attenuation problem of traditional filters, reduces production and maintenance costs, and improves product reliability.

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Abstract

The utility model discloses a small-size high-frequency band-pass surface-mounted crystal filter, particularly relates to the field of surface-mounted crystal filters, and comprises a PCB mainboard, and the surface of the PCB mainboard is provided with a slotted hole, a first mounting groove, a second mounting groove and a third mounting groove. A plurality of positioning grooves are symmetrically formed in the periphery of the PCB main board, a capacitor board and a crystal board are arranged on the surface of the PCB main board, and a shielding clamp is arranged at the top of the crystal board. According to the utility model, the capacitor plate and the crystal plate are inserted into the third mounting groove and the second mounting groove through the mounting strips to be mounted and fixed on the PCB mainboard, the fine tuning capacitor and the fixed capacitor are welded on the capacitor plate, and the iron sheet crystal is welded on the crystal plate; in the repair process, only the capacitor board and the crystal board need to be replaced, the whole PCB mainboard does not need to be replaced, the production cost and the maintenance cost are reduced, and the production efficiency is improved.
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