一、Characteristics
The principle of LC filter (also known as LC passive filter) is to filter through the series parallel combination of inductors and capacitors, inductors have inductive reactance to high-frequency signals, and capacitors have capacitive reactance to low-frequency signals. By adjusting the values of inductance and capacitance, signals within a specific frequency range can be selectively transmitted or blocked. The main function of LC filter is to filter out noise, so as to achieve the goal of filtering unnecessary signals and noise to improve the receiving quality, to achieve the filtering of specific signals. LC filter has good selectivity and slope characteristics, it can achieve steep roll down, that is, the signal near the cutoff frequency is sharply attenuated, so as to effectively remove high-frequency noise or low-frequency clutter.
LC filters can be roughly divided into four basic types, namely: LC high-pass filter, LC low-pass filter, LC band-pass filter, LC band-stop filter. The upper frequency of LC low-pass filter is 300MHz~8GHz; The lower limit frequency of LC high-pass filter is 500MHz~18GHz; The frequency range of LC bandpass filter is 0.5MHz~6GHz; The low-end frequency of LC band-stop filter can be 50MHz, and the high-end can be 4GHz. The 0.05dB Chebyshev function of these filters is 3dB standard bandwidth 0.5%-150%, series: 2~12, easy welding, good weldability, small size (L: 20-70 mm; W: 10-20 mm; H: 7-12 mm), light weight, easy welding, easy debugging, easy maintenance.
LC filter
二、Model & Electrical characteristics
LC filter (passive filter) model and parameter table
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| Part No | Center Frequency(MHz) | Band Width (MHz) | Insertion loss (dB max) | V.S.W.R Ratio | Attenuation (dB) | Size (mm) |
| XBF5R0069A | 21.4 | 5.6 | 3 | 1.5 | 60 @ 10.8 MHz | 13.5 * 9 * 5 |
| XBF5R0023A | 30 | 1 | 2.5 | 1.5 | 50 @ 20 MHz | 23 *10 * 6.7 |
| XBF7R0100A | 67.5 | 25 | 3 | 1.5 | 30 @ 110 MHz | 20 * 10 * 7 |
| XBF5R0070A | 70 | 8 | 4.5 | 1.5 | 60 dB / 3 dB ≤ 3.0 | 15 * 10 * 6.5 |
| XBF140P100B | 140 | 100 | 1.8 | 1.5 | 30 @ fo ± 60 MHz | 26.6 * 10 * 7 |
| XBF6R0074A | 152 | 40 | 2.5 | 1.5 | 60 @ 204 MHz | 24 * 8.5 * 7 |
| XBF275P150A | 275 | 150 | 2 | 1.5 | 60 @ 450 ~ 625 MHz | 26.6 * 10 * 7 |
| XBF6R0029A | 360 | 1 | 2.5 | 1.5 | 60 @ fo ± 90 MHz | 26.6 * 10 * 7 |
| XBF1050C500A | 1050 | 500 | 1 | 1.5 | 60 @ 840 MHz | 36 * 13 * 8 |
| XBF8R0007A | 1092.5 | 285 | 1.3 | 1.5 | 60 @ 1800 MHz | 43 * 14 * 9 |
| XBF1350C800A | 1350 | 800 | 2 | 1.5 | 60 @ 2450 MHz | 36 * 13 * 8 |
| XBF1370P660A | 1370 | 660 | 2.5 | 1.5 | 38 @ 900 MHz | 26.6 * 10 * 7 |
| Note: Due to many product models, only some representative models are listed in the table |
三、Application & attention
LC filter (also known as LC passive filter) is widely used in aerospace, aviation, navigation, radar, electronic countermeasures, remote sensing, telemetry, navigation, civil aviation, airport tower, naval ships, microwave communication, subway communication, public security fire protection, mobile communication, satellite communication, scientific research, medical equipment, deep sea detection, high-definition image transmission, radio and television and other military and civilian microelectronics communication equipment Ready. 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 filter (passive filter), can be customized 3-7 order, 3dB bandwidth from 3% to 200%, frequency range from 0.5MHz to 6GHz, size of (long 10-20mm; Width 7-12mm; High 5-10mm) LC bandpass filter, LC high-pass filter, LC low-pass filter, LC band-stop filter. LC filters can be customized according to user needs. This kind of device is a highly customized device, the parameter requirements of the device should be clearly stated before the order, and the parameter requirements beyond the physical limit of the material can be negotiated by both sides to achieve the best indicators.
