一、Characteristics
LC band-stop filter (referred to as LC type BSF filter, passive filter) is used to filter signals in a specific frequency range, while retaining signals in other frequency ranges. The principle of LC band-stop filter is based on the series or parallel characteristics of capacitor, inductor and resistance components in the circuit, using different resistance values in the signal path to change the passing capacity of the signal frequency, generate phase delay for the signal frequency in the specific range of the band-stop filter, and together with the resistance components constitute a frequency-selective signal attenuation network. Thus weakening or eliminating signals in a specific frequency range.
In the power supply circuit, the LC band-stop filter can eliminate the harmonic and high-frequency interference in the power supply to ensure the normal operation of the equipment. In audio circuits, LC band-stop filters can improve sound quality and eliminate high-frequency interference or low-frequency background noise. In the communication system, LC band stop filter can remove the noise and stray frequency in the signal to ensure the clarity and reliability of the signal.
LC band-stop filter (referred to as LC type BSF filter, belongs to the passive filter) through the frequency of DC~860MHz / 885-2500mhz (can be customized according to the actual needs of the user bandwidth), with low insertion loss, high isolation, high power, easy welding, good weldability, small size, stable and reliable performance, light weight and so on.
LC band-stop filter
二、Model & Electrical characteristics
| LC band stop filter (LC type BSF filter) model and parameter table |
| Part No | Center Frequency (MHz) | Insertion loss (dB max) | V.S.W.R Ratio | Attenuation (dB) | Size (mm) |
| XBRF520P20A | 300 ~ 510 / 530 ~ 700 | 3.8 | 1.9 | 25 @ 520 ~ 523 MHz | 16.4 x 28 x 7.0 |
| XBRF100C41A | 50 ~ 79 / 120 ~ 470 | 1.8 | 2.2 | 54 @ 87.5 ~ 108 MHz | 36 x 13 x 18 |
| XBRF683P10A | DC ~ 660 / 705 ~ 900 | 1.8 | 2.2 | 23 @ 677 ~ 687 MHz | 14 x 24 x 6.5 |
| Note: Due to many product models, only some representative models are listed in the table |
三、Application & attention
LC band stop filter is widely used in radar, electronic countermeasures, remote sensing, telemetry, civil aviation, airport tower, naval ships, microwave communication, subway communication, public security fire protection, mobile communication, satellite communication, medical equipment and other military and civilian microelectronics communication equipment. In use, the input/output outlet can be used interchangeably, but pay attention to the good grounding of the shell, otherwise it will affect the out-of-band suppression and flatness indicators, the temperature should not be too high during welding, and the time should not be too long. If reflow welding is used, the recommended melting point temperature of the solder is 180 ° C, and wave soldering is not recommended. Products should be stored in the ambient temperature of -10℃~40℃, relative humidity is not more than 80%, the surrounding environment is not acidic, alkaline and other harmful gases in the warehouse. Do not soak when cleaning, it is recommended to wipe with alcohol.
The company has a variety of interface types of LC bandstop filter (passive filter), can be customized 3-7 order, 3dB bandwidth from 3% to 200%, frequency range: 0.5MHz to 6GHz, size is (long 10-20mm; Width 7-12mm; High 5-10mm) LC band block filter, LC band block filter is a strong customization of the device, before the order to clearly specify the parameter requirements of the device, beyond the material physical limit of the parameter requirements, can be negotiated by both sides to achieve the best indicators.
