一、Characteristics
The characteristic of LC low-pass filter is that when the signal is lower than the cutoff frequency, the signal can pass normally; When the signal is above a certain frequency, the signal will be greatly attenuated. The operating frequency range of LC low-pass filter is relatively wide, and the high-end frequency can be in the frequency range of 500MHz~8GHz. Input/output 50Ω (if 75Ω is required, it must be specially indicated) impedance matching, small standing wave, easy to use cascaded, flat in-band frequency characteristics, small insertion loss, high out-of-band inhibition, narrow transition frequency band, stable and reliable performance in the full temperature range of -55℃ ~ +85℃.
Limit parameters can be achieved: maximum input power: 1W; Operating temperature range: -55℃~+85℃; Storage temperature range: -65℃~+125℃, under the condition of 30G impact, sustainable 11ms time, under the condition of vibration frequency of 5-500Hz, 10G all indicators meet the requirements.
There are a variety of international standards and fully sealed shell packaging forms to choose from, a variety of response functions to choose from, flexible design, can be customized according to user requirements and shape packaging requirements. This kind of product has the advantages of easy welding, small size, light weight, high inhibition, wide frequency range, stable performance, high reliability, LC microassembly process integration, good consistency, short delivery time and so on.
LC low-pass filter
二、Model & Electrical characteristics
| LC low-pass filter (LC type LPF filter) model and parameter table |
| Part No | Cut-off frequency（MHz） | Insertion loss （dB max） | V.S.W.R （Ratio） | Attenuation （dB） | Size （mm） |
| XLF0.3PB | 0.3 | 1.5 | 1.5 | 20 @ 0.6 MHz | 15.5 * 10.5 * 9 |
| XLF120PA | 120 | 1.5 | 1.5 | 90 @ 120 MHz | 15.5 * 10.5 * 7 |
| XLF4R0051A | 60 | 3 | 1.5 | 20 @ 120 MHz | 15.5 * 10.5 * 7 |
| XLF3600PE | 3600 | 2 | 1.5 | 40 @ 4.6 MHz | 14.2 * 9.2 * 7 |
| Note: Due to many product models, only some representative models are listed in the table |
三、Application & attention
The user scenario of LC low-pass filter is very wide, covering many fields such as signal processing, communication, image processing, video compression, and biological signal processing, and it plays an important role in removing high-frequency noise, smoothing signals, and reducing bandwidth requirements. Commonly used in radar, electronic countermeasures, remote sensing, telemetry, navigation, civil aviation, airport tower, naval ships, microwave communication, subway communication, public security fire 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.
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 temperature is recommended, 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 low-pass filter (passive filter) for users to choose, can be customized 3-7 order, 3dB bandwidth from 3% to 200%, high-end frequency can be from 0.3MHz to 6GHz LC low-pass filter, LC high-pass filter, LC bandpass filter, LC band-stop filter. The design is flexible. Because the indicators of microwave components are related to each other and sound to each other, the user needs to clearly state the indicator requirements before customization. Once the product is made, it cannot be changed. If there are indicators that exceed the physical limit of the material itself, the best indicators can be achieved through negotiation between the two parties.
