company blog about Supply ST RF Filters:Low-Pass Filters,High-Pass Filters,Band-Pass Filters,Band-Reject Filters

Supply ST RF Filters:Low-Pass Filters,High-Pass Filters,Band-Pass Filters,Band-Reject Filters

Shenzhen Mingjiada Electronics Co., Ltd. is a well-known distributor of electronic components, adhering to the business philosophy of ‘serving customers and benefiting customers.’ The company provides high-quality electronic product supply services and efficient, convenient supply chain support to domestic and international electronics companies.

Main products include: integrated circuits (ICs), 5G chips, new energy ICs, IoT chips, Bluetooth chips, automotive chips, artificial intelligence ICs, Ethernet ICs, memory chips, sensors, IGBT modules, and a range of other products.

Supply advantages: First, the company maintains an inventory of over 2 million product models, covering military-grade, industrial-grade, and various high-tech components, enabling rapid response to customer needs across all stages from R&D to mass production; Second, all supplied products are sourced directly from original manufacturers or authorised channels, providing complete batch traceability and warranty services to ensure product reliability and consistency; Third, leveraging its dual warehouse layout in Shenzhen and Hong Kong, along with a global logistics partner network, the company can ship 98% of orders within 48 hours, supporting flexible procurement models as small as a single item.

RF front-end filters address a variety of functions such as band-pass, low-pass, and high-pass filters. RF filters can be easily integrated into front-end modules using ST's thin-film RF IPD process. This process integrates high-quality passive RF components into a single glass or high-resistance silicon substrate.

Applications

What are RF Fliters used for?

RF filters enable or inhibit selected signals or frequencies to eliminate interference or the transmission of unwanted signals. So, our RF filters address a wide range of applications such as mobile and connected devices, cellular base-stations, and consumer applications.

IoT Applications

IoT for Smart Home and City

IoT for Smart Industry

IoT for Smart Things

Industrial

Asset Tracking

Energy Generation and Distribution

Factory automation

Home and Professional Appliances

Home, Building and City Automation

Types of RF filters

There are four basic types of RF filters: high-pass, low-pass, band-pass, and band-reject filters.

Low-pass filters:

There are various types of low-pass filters. The main use of this filter is to suppress the harmonics of the RF amplifier. This characteristic helps avoid unwanted interference in different transmission bands. High frequency filtering give signals a sharper and clearer quality.

High-pass filters:

In contrast to low-pass filters, high-pass filters attenuate frequencies below a certain threshold so only high-frequency signals can pass. The high-pass filter can be used in combination with a low-pass filter to form a band-pass filter.

Band-pass filters:

Band-pass filters are circuits that pass signals of two different frequencies and attenuate signals outside a given range. ST RF IPD band-pass filters do not use an external power source and integrate passive components like inductors and capacitors. Active band-pass filters instead need external power and active components like integrated circuits and transistors.

Band-pass filters are commonly used in wireless receivers and transmitters. Band-pass filters minimize the bandwidth of output signals to allow transmitters to send data at desired speeds and formats.

Band-pass filters in receivers only allow desired frequencies to be decoded, while blocking the inclusion of other signals from unwanted frequencies.

Overall, a well-designed bandpass filter can easily maximize signal quality while minimizing conflicts and interference between signals.

Band-reject filters:

A band-reject or notch filter allows most signal frequencies to pass, but attenuates specific frequency ranges to very low levels. It is the opposite of the band-pass filter.

Which RF filter do I need?

For Bluetooth applications, the MLPF-WB-01D3, MLPF-WB-01E3 and MLPF-WB55-01E3 are impedance matched harmonics filters optimized for our dual-core, multiprotocol wireless STM32WB55Cx, STM32WB55Rx, STM32WB35xx, STM32WB50xx, STM32WB30xxx, STM32WB1xx microcontrollers. It requires seven times less PCB space than the equivalent L-C discrete solution.

The MLPF-WB55-02E3 is tailored to match the output impedance of the STM32WB55Vx, STM32WB1x series, while the MLPF-WB-02D3 is designed to maximize the RF performance of STM32WB5x and STM32WB1x wireless MCUs. In addition, the MLPF-NRG-01D3 is tailored for the BLUENRG-LP(S) systems-on-chip.