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Ceramic low-pass filter is to filter specific signals by selecting suitable ceramic materials and designing reasonable resonators, which is mainly used in frequency selection network to achieve the purpose of separating different frequency currents. Ceramic low-pass filter has the advantages of high inhibition, low insertion loss, high power, high Q value, good amplitude/phase frequency characteristics, high signal-to-noise ratio, good thermal stability, low temperature coefficient, surface mount, small volume, light weight, etc. Widely used in base stations, routers, drones, radar, T/R components, RF microwave, Wi-Fi, repeater, mobile communications and consumer electronics.
一、Characteristics
The characteristic of dielectric filter low-pass filter (also known as ceramic 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 working principle of ceramic low-pass filter is based on the characteristics and resonance phenomenon of ceramic materials, by selecting suitable ceramic materials and designing reasonable resonators to filter specific signals. The function of the ceramic filter is to filter out the noise and let the useful signal pass through, so as to achieve the purpose of separating the current of different frequencies. Ceramic low-pass filters are mainly used in frequency selection networks to separate currents of different frequencies.
Dielectric low-pass filter has a wide frequency range (300MHz ~ 10GHz), high inhibition, low insertion loss, high power, high Q value, good amplitude-frequency/phase-frequency characteristics, high signal-to-noise ratio, good thermal stability, low temperature coefficient, surface mount, small size, light weight, easy welding, input/output 50Ω impedance matching, easy to cascade use; The performance is stable and reliable in the full temperature range, meeting the military working environment requirements (-55℃ ~ +85℃) and other advantages.
Dielectric low-pass filter
二、Model & electrical characteristics
| Dielectric low-pass filter (ceramic low-pass filter) model and parameter table | ||||||||
| Part No | Center Frequency (MHz) | Insertion loss (dB Max) | BW (MHz) | Ripple (dBMax) | V.S.W.R (Max) | Attenuation(dB Min) | Size(mm) | SPEC |
| DFB395R10GA | 395.0 | 3.0 | ±5.0 | 0.5 | 1.5:1 | 25min@10~350 MHz 10min@410~500 MHz 30min@7000~900 MHz 25min@1000 MHz | 20*8*28 |
|
| DFC1069LP237A | 475.0 | 2.5 | 237 | 1.1@36MHz | 2.5:1 | 25min@1244 MHz | 5.8*2.65*6 |
|
| DFC1192LP484A | 475.0 | 2.5 | 484.0 | 1.1@36MHz | 2.5:1 | 25min@1494 MHz | 5.8*2.65*5 |
|
| DFC1339LP778A | 475.0 | 2.5 | 778.0 | 1.1@36MHz | 2.5:1 | 25min@1785 MHz | 5.8*2.65*4.25 |
|
| DFC1340LP780A | 475.0 | 3.0 | 780.0 | 1.6@36MHz | 2.5:1 | 25min@1772 MHz 25min@1792 MHz | 5.8*2.65*4.25 |
|
| DFC1396LP892A1 | 475.0 | 2.5 | 892.0 | 1.1@36MHz | 2.5:1 | 25min@1900 MHz | 5.8*2.65*4 |
|
| DFC1400LP900A | 475.0 | 2.5 | 900.0 | 1.1@36MHz | 2.5:1 | 25min@1912 MHz | 5.8*2.65*4 |
|
| DFC1700LP750A | 475.0 | 3.5 | 750 | 2.0 | 3.0:1 | 25min@1740 MHz | 5.8*2.65*4.49 |
|
| DFC555B30A | 555.0 | 2.5 | ±15.0 | 1.0 | 1.7:1 | 15min@626 MHz 25min@484 MHz 40min@335 MHz | 6*3*8.6 |
|
| DFC717B09A3 | 717.5 | 2.5 | ±12.5 | 1.0 | 2.0:1 | 13min@788 MHz 25min@646 MHz 36min@497 MHz | 5.8*2.8*8.7 |
|
| DFC836B24A | 836.0 | 2.5 | ±12.0 | 1.0 | 2.0:1 | 10min@896 MHz ;20min@776 MHz | 5.8*2.8*7.9 |
|
| DFB836S25DA | 836.5 | 3.0 | ±12.5 | 0.5 | 1.5:1 | 7.0min@DC~350 MHz 15min@869~894 MHz 50min@fo±130 MHz 50min@1738~1788 MHz | 13.6*4.5*16 |
|
| DFC1497HP506A | 875.0 | 2.5 | 506.0 | 1.1@36MHz | 2.5:1 | 30min@1187 MHz | 5.8*2.65*6.4 |
|
| DFM875S10ED | 875.0 | 3.0 | ±5.0 | 1.0 | 2.5:1 | 7min@887 MHz | 13*5*12 |
|
| DFC915D05A4 | 915.0 | 3.2 | ±2.5 | 0.7 | 2.0:1 | 55min@452MHz 40min@806MHz 40min@849MHz 10min@901MHz 10min@932MHz 33min@1900MHz | 6*3*8.7 |
|
| DFC915B26A | 915.0 | 2.5 | ±13.0 | 0.5 | 2.0:1 | 17min@992.5 MHz 27min@837.5 MHz | 5.8*2.8*7 |
|
| DFN944S20HA | 944.0 | 1.5 | ±10.0 | 1.0 | 1.3:1 | 35min@889~909 MHz | 16*8*7.6 |
|
| DFC1747HP506A | 1000.0 | 2.5 | 506 | 1.1@36MHz | 2.5:1 | 25min@1434 MHz | 5.8*2.65*5.55 |
|
| DFC1740HP410A | 1075.0 | 3.5 | 410 | 2.0 | 3.0:1 | 25min@1700 MHz | 5.8*2.65*4.6 |
|
| DFC1968HP365A | 1075.0 | 2.5 | 365.0 | 1.1@36MHz | 2.5:1 | 25min@1728 MHz | 5.8*2.65*4.52 |
|
| DFC1971HP358A | 1075.0 | 2.5 | 358.0 | 1.1@36MHz | 2.5:1 | 25min@1731 MHz | 5.8*2.65*4.52 |
|
| DFC2025HP250A1 | 1075.0 | 2.5 | 250.0 | 1.1@36MHz | 2.5:1 | 25min@1842 MHz | 5.8*2.65*4.2 |
|
| DFC2031HP238A | 1075.0 | 2.5 | 238.0 | 1.1@36MHz | 2.5:1 | 25min@1850 MHz | 5.8*2.65*4.2 |
|
| DFN1232R136EA | 1232.0 | 0.7 | ±68.0 | 0.4 | 1.5:1 | 30min@1032 MHz 7min@1432 MHz | 9.2*4*8 |
|
| DFF1235P44DA | 1235.0 | 1.0 | ±22 | 0.3 | 1.5:1 | 25min@1559~1615 MHz | 6.6*3.5*9.2 |
|
| DFN1241R73EA | 1241.5 | 0.8 | ±36.5 | 0.4 | 1.5:1 | 15min@1141.5 MHz 10min@1341.5 MHz | 9.2*4*8.6 |
|
| DFF1268P40DB | 1268.0 | 0.7 | ±20 | 0.3 | 2.0:1 | 15min@1518 MHz 15min@1018 MHz | 6.6*3.5*8.8 |
|
| DFN1567R95EA | 1567.5 | 0.7 | ±47.5 | 0.4 | 1.5:1 | 6min@1467.5 MHz 40min@1167.5 MHz 30min@1367.5 MHz 18min@1767.5 MHz | 9.2*4*6.7 |
|
| DFF1568P17DC | 1567.5 | 1.3 | ±8.5 | 0.5 | 2.0:1 | 6min@1616 MHz 30min@2492 MHz | 6.6*3.5*10.5 |
|
| DFC1575S10A3 | 1575.0 | 1.0 | ±5.0 | 0.5 | 1.5:1 | 5.0min@1625 MHz 5.0min@1525 MHz | 6.9*3.8*10.8 |
|
| DFC1575P10A | 1575.42 | 3.0 | ±5.0 | 3.5 | 2.0:1 | 25min@1675 MHz 40min@1475 MHz | 5.8*2.8*5.1 |
|
| DFC1575E10A1 | 1575.42 | 3.0 | ±5.0 | 1.0 | 2.0:1 | 15min@1525 MHz 40min@1697 MHz | 6*3.3*5.05 |
|
| DFN1587S56EA | 1587.0 | 1.6 | ±28.0 | 1.0 | 1.43:1 | 40min@1487 MHz 40min@1687 MHz | 10.8*3.85*7.1 |
|
| DFF1589P38DB | 1589.0 | 1.0 | ±19 | 0.3 | 1.5:1 | 40min@248 MHz 10min@1495 MHz 25min@1395 MHz 45min@1195 MHz | 6.6*3.5*7.6 |
|
| DFC2200HP1100A | 1650.0 | 2.0 | 1100 | 1.1@36MHz | 2.5:1 | 25min@2100 MHz | 5.8*2.65*5.5 |
|
| DFM1722S25EA | 1722.5 | 2.5 | ±12.5 | 1.0 | 1.5:1 | 50min@1817 MHz | 13*5*12 |
|
| DFM1722W25FA | 1722.5 | 4.0 | ±12.5 | 1.5 | 1.4:1 | 6min@fo±20 MHz 40min@fo-55 MHz 45min@fo+55 MHz | 22.5*6.5*10.9 |
|
| DFM1747Y75GC | 1747.5 | 6.0 | ±37.5 | 3.3 | 1.8:1 | 65min@890~960 MHz 35min@1795 MHz 50min@1805~1880 MHz 50min@1920~2170 MHz | 28.5*6.9*11 |
|
| DFM1842Y75GC | 1842.5 | 6.0 | ±37.5 | 3.5 | 1.8:1 | 60min@890~960 MHz 35min@1795 MHz 50min@1710~1785 MHz 50min@1920~2170 MHz | 28*6.9*11 |
|
| DFM1882L65HA | 1882.5 | 5.5 | ±32.5 | 3.5 | 1.3:1 | 25min@1922.5 MHz 50min@1930~1990 MHz | 43.5*9.5*13 |
|
| DFC1900S40ED | 1900.0 | 3.0 | ±20 | 1.0 | 1.5:1 | 30min@fo±60 MHz 40min@2010~2025 MHz | 10.8*3.8*5.9 |
|
| DFB1952S145DA | 1952.5 | 2.0 | ±72.5 | 0.5 | 2.0:1 | 30min@2400 MHz 30min@4000 MHz | 13*4.5*13 |
|
| DFM1962L65HA | 1962.5 | 5.5 | ±32.5 | 0.5 | 1.2:1 | 25min@1922.5 MHz 60min@1830~1910 MHz | 43.5*9.5*13 |
|
| DFM2017T15EA | 2017.0 | 3.0 | ±7.5 | 1.0 | 1.3:1 | 50min@1920 MHz 30min@1980 MHz 50min@2110~2170 MHz 50min@2320~2370 MHz | 14*5.5*10 |
|
| DFM2017S15EE | 2017.5 | 3.0 | ±7.5 | 1.0 | 1.5:1 | 45min@fo-100 MHz 45min@fo+100 MHz | 13*5*12 |
|
| DFM2140Y60GA | 2140.0 | 6.0 | ±30.0 | 3.5 | 1.7:1 | 8min@fo±32.7 MHz 10min@fo+33.5 MHz 30min@fo+42.5 MHz | 28*6.9*11 |
|
| DFM2140S60EB | 2140.0 | 3.0 | ±30.0 | 1.0 | 1.5:1 | 45min@fo-100 MHz 45min@fo+100 MHz | 13*5*13 |
|
| DFC2326H12A1 | 2326.25 | 2.5 | ±6.25 | 1.2 | 2.0:1 | 18min@2227 MHz 10.5min@2341.25 MHz | 7.3*3.06*7.1 |
|
| DFM2335Y70HA | 2335.0 | 2.5 | ±35.0 | 1.0 | 1.5:1 | 20min@1990~2280 MHz 35min@2400~2485 MHz | 33.4*9*12 |
|
| DFM2345S50EC | 2345.0 | 2.0 | ±25.0 | 1.0 | 1.5:1 | 40min@1920~2170 MHz 40min@2555~2655 MHz | 13.5*5*12 |
|
| DFM2345S50GI | 2345.0 | 1.5 | ±25.0 | 0.8 | 1.3:1 | 15min@24100 MHz 10min@f2300 MHz 35min@900 MHz | 15.5*7.5*10 |
|
| DFM2345W50FA | 2345.5 | 3.0 | ±25.0 | 1.0 | 1.4:1 | 45min@fo+100 MHz 45min@fo+100 MHz 55min@fo-140 MHz | 22.5*6.5*10.9 |
|
| DFN2350W100EA | 2350.0 | 2.0 | ±50.0 | 1.0 | 1.4:1 | 20min@3437 MHz 40min@2450~2500 MHz | 15.9*4.3*7.4 |
|
| DFC2332H25A2 | 2332.5 | 2.5 | ±12.5 | 1.0 | 2.0:1 | 35min@2106 MHz 35min@2571 MHz | 7.2*3.2*7 |
|
| DFC2338P13A2 | 2338.75 | 2.5 | ±6.5 | 1.0 | 1.5:1 | 24min@2108 MHz 24min@2568 MHz | 7.3*3.65*7.1 |
|
| DFC2442V84A1 | 2442 | 2.0 | ±42 | 1.0 | 2.0:1 | 25min@2150 MHz | 3.0*1.7*3.4 |
|
| DFM2491X10FA | 2491.75 | 2.5 | ±5.0 | 1.0 | / | 40min@1611~1621 MHz 65min@2396.25 MHz | 13*6*12 |
|
| DFM2492R10GB | 2492.0 | 1.2 | ±5.0 | 0.3 | 1.5:1 | 8min@fo±100 MHz 20min@fo±200 MHz | 16.0*7.2*10.2 |
|
| DFM2605W60FA | 2605.0 | 2.8 | ±30.0 | 1.0 | 1.4:1 | 50min@885~909 MHz 50min@930~954 MHz | 22.5*6.5*9 |
|
| DFD2620S50EA | 2620.0 | 2.2 | ±25.0 | 1.0 | 1.4:1 | 50min@fo±55 MHz 40min@fo±120 MHz 38min@fo±138.24 MHz | 10.8*3.8*5.7 |
|
| DFC3450H300A2 | 3450.0 | 2.0 | ±150 | 1.0 | 1.7:1 | 35min@660~720 MHz 35min@1320~1440 MHz 40min@1980~2160 MHz 5min@2970~3240 MHz 25min@3960~4320 MHz 20min@4620~5040 MHz 25min@5280~5760 MHz 17min@7260~7920 MHz 15min@8580~9360 MHz | 7.4*3*4.4 |
|
| DFC3470S40EA | 3470 | 2.0 | ±50 | 1.0 | 1.5:1 | 15min@3300~3370 MHz 15min@3570~3700 MHz | 10.8*3.85*5.9 |
|
| DFN3500W200EA | 3500.0 | 2.5 | 200 | 1.0 | 1.9:1 | 25min@3320 MHz 25min@3680 MHz | 15.9*4.5*7.3 |
|
| DFN3700W200EA | 3700.0 | 2.0 | 200 | 1.0 | 1.9:1 | 25min@3520 MHz 25min@3880 MHz | 16.4*4.5*6.2 |
|
| DFC5235S180DFA | 5235.0 | 2.5 | ±90.0 | 1.0 | 1.9:1 | 50min@5490~58500 MHz | 8.6*2.9*3.5 |
|
| DFC5240G200A | 5240.0 | 1.5 | ±100.0 | 1.0 | 1.9:1 | 30min@2400~2700 MHz 21min@5480~5860 MHz | 3.*1.85*2.8 |
|
| DFC5240180DA | 5240.0 | 2.0 | ±90 | 1.0 | 1.9:1 | 40min@5490~5850 MHz | 8.6*3*4 |
|
| DFC5245G190A | 5245.0 | 3.0 | ±95 | 1.2 | 1.9:1 | 30min@2400~2500 MHz 25min@5480~5550 MHz 30min@5550~5900 MHz | 3.6*1.85*2.8 |
|
| DFC5250S160DC | 5250.0 | 2.3 | ±80 | 1.2 | 1.67:1 | 40min@5490~5835 MHz | 8.2*3*4 |
|
| DFN5250S160DA | 5250.0 | 3.0 | ±80.0 | 1.2 | 1.67:1 | 50min@5490~5835 MHz | 8.2*3.3*5.3 |
|
| DFN5662S345DA | 5662.5 | 3.0 | 345 | 1.5 | 1.67:1 | 50min@5170~5330 MHz | 8.2*3.3*5.3 |
|
| DFC5662S345DC | 5662.5 | 2.3 | 345 | 1.0 | 1.67:1 | 40min@5170~5330 MHz | 8.2*3*4 |
|
| DFC5665G370A | 5665.0 | 3.0 | ±185 | 1.0 | 1.9:1 | 30min@2400~2500 MHz 25min@5150~5340 MHz | 3.6*1.85*2.68 |
|
| DFC5670G380A | 5670.0 | 1.5 | ±190 | 1.0 | 1.9:1 | 25min@2400~2700 MHz 21min@5140~5340 MHz | 3.6*1.85*2.68 |
|
| DFC5670S360DA | 5670.0 | 2.0 | ±180 | 1.0 | 1.9:1 | 40min@5150~5330 MHz | 8.6*3*3.8 |
|
| DFC5697S360DF | 5670.0 | 2.5 | ±180 | 1.3 | 1.0 | 50min@5150~5330 MHz | 8.6*2.9*3.45 |
|
| Note: Due to many product models, only some representative models are listed in the table | ||||||||
三、Application & attention
Ceramic low-pass filters are widely used in base stations, T/R components, RF microwave, Wi-Fi, repeater, mobile communications and consumer electronics. When in use, pay attention to the grounding end is well grounded, otherwise it will affect out-of-band suppression and flatness indicators. The welding temperature should not be too high and the welding 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 sizes of ceramic low-pass filters (dielectric low-pass filters) for users to choose from, can be customized from 300MHz to 10GHz ceramic low-pass filters, ceramic high-pass filters, ceramic band-pass filters, ceramic band-stop filters. 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.
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