一、Characteristics
The LC high-pass filter (referred to as HPF filter) is characterized by the exclusion of low-frequency signals and the emphasis on high-frequency signals. The higher the additive characteristic, the stronger the ability to filter out low-frequency signals, and the greater the strength of the high-frequency signals it emphasizes. The function of the LC high-pass filter is that when the signal is higher than a certain cutoff frequency, the signal can pass normally, and when the signal is lower than a certain frequency, the signal will be greatly attenuated.
The low-end operating frequency of LC high-pass filter can be 1MHz~3GHz, input/output 50Ω (or 75Ω, it must be specially noted) impedance matching, small standing wave, easy to cascaded use, 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: 2W; Operating temperature range: -55℃~+85℃; Storage temperature range: -65℃~+125℃, input/output can be used interchangeably.
LC high-pass filter
二、Electrical Characteristics
| LC high-pass filter (LC type HPF filter) model and parameter table |
| Part No | Cut-off frequency(MHz) | Insertion loss (dB max) | V.S.W.R (Ratio) | Attenuation (dB) | Size (mm) |
| XHF85CA | 84.5 ~ 200 | 1 | 1.5 | 50 @ DC ~ 20 MHz | 26 * 13 * 8 |
| XHF1800CA | 1800
| 1.5 | 1.5 | 50 @ 800 MHz | 26 * 13 * 10 |
| XHF6R0022A | 965 ~ 2900 | 5 | 2 | 30 @ 800 MHz | 20 * 10 * 7 |
| XHF2700PA | 2700 ~ 3500 | 0.4 | 1.6 | 15 @ 800 MHz | 8 * 8 * 4.7 |
Note: Due to many product models, only some representative models are listed in the table
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三、Application & attention
LC high-pass 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 exploration, high-definition image transmission, radio and television and other electronic equipment and communication systems.
When using the LC high-pass filter, pay attention to the good grounding of the shell, otherwise it will affect the out-of-band suppression and flatness indicators, and the welding temperature should not be too high 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 high-pass filter (passive filter) for users to choose, flexible design. Can be customized 3-7 order, 3dB bandwidth from 3% to 200%, high-end frequency can be from 1MHz to 3GHz LC high-pass filter, LC low-pass filter, LC band-pass filter, LC band-stop filter. 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.
