Radio frequency front-end circuit and radio frequency front-end module

CN224343189UActive Publication Date: 2026-06-09RADROCK (SHENZHEN) TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
RADROCK (SHENZHEN) TECH CO LTD
Filing Date
2025-06-30
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

When existing RF front-end modules transmit signals simultaneously using filters in different frequency bands, signal crosstalk issues can occur, affecting the normal transmission of RF signals.

Method used

The design employs an RF front-end circuit that includes a first filter module, a second filter module, a third filter module, a resonant module, and an RF switch. By switching the adjustable resonant frequency of the resonant module between different transmission paths, unnecessary frequency band signals are prevented from entering the main transmission path, ensuring normal signal transmission.

Benefits of technology

This effectively avoids signal crosstalk problems, ensures that radio frequency signals of different frequency bands can be transmitted normally, and improves the working stability and efficiency of radio frequency front-end circuits.

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Abstract

This application discloses a radio frequency (RF) front-end circuit and an RF front-end module. The RF front-end circuit includes a first filter module, a second filter module, a third filter module, a resonant module, and an RF switch. The RF switch has an antenna terminal, a first terminal, a second terminal, and a third terminal. The first filter module is connected to the first terminal, the second filter module is connected to the second terminal, and the third filter module is connected to the third terminal. The resonant module is connected between the first filter module and the first terminal of the RF switch. The resonant module in this application can prevent second-band RF signals from entering the first transmission path, thereby effectively avoiding signal crosstalk and ensuring normal transmission of RF signals. In addition, the resonant module can also prevent third-band RF signals from entering the first transmission path, thereby effectively avoiding signal crosstalk.
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