一、Characteristics
S-band ceramic filters have a wide frequency coverage range of 2GHz-4GHz, and the filters made using this frequency band are called S-band ceramic filters. The function of the S-band ceramic filter is to filter out the noise and let useful signals pass through, so as to achieve the purpose of separating currents of different frequencies. Ceramic filters are mainly used in bandwidth control circuits such as frequency selection networks, intermediate frequency tuning, frequency discrimination and filtering.
S-band media filter has bandwidth control ability, strong penetration ability, strong anti-interference ability, high-end parasitic passband far, low temperature coefficient, good thermal stability (stable and reliable performance in the full temperature range), meet the requirements of the military working environment (-55℃ ~ +85℃), input/output 50Ω impedance matching, easy to cascade use, input/output interchangeable use. Flat in-band frequency characteristics, small insertion loss, high out-of-band suppression, good consistency, high Q value, small standing wave, small volume, light weight, flexible design and easy installation. The maximum input power of the S-band dielectric filter is 20W (limit power), the operating temperature range is -55 ° C ~+85 ° C, and the storage temperature range is -65 ° C ~+125 ° C.
S-band ceramic filters
二、Model & Electrical characteristics
| S-band dielectric filter (S-band ceramic filter) model and parameter table |
| Part No | Center frequency (MHz) | Insertion loss (dB Max ) | Band Width (MHz) | V.S.W.R (dB Max) | Power (W) | Attenuation(dB/dBc) | Size(mm) |
| DMF44C1995S30A | 2185.0 | 2.0 | ± 35 | 1.0 | 1.0 | 35 dB @ 1980~2010 MHz | 7.6*6.5*3.7 |
| DMF44C2185C30A | 2185.0 | 1.5 | ± 15 | 1.0 | 5.0 | 35dBc@1970~2010 MHz 35dBc@ 1250~2200 MHz | 12.0*6.5*4.2 |
| DMF44C1995F30C | 1995.0 | 2.0 | ± 15 | 0.7 | 1.0 | 35dB@1700~1880 MHz 40dBc@ 2170~1620 MHz | 9.5*5.6*3.8 |
| DMF54C1995C30A | 1995.0 | 1.5 | ± 15 | 1.0 | 10.0 | 40dBc@2170~2200 MHz(Full TEMP) 20dB@3500 MHz | 11.5*9.0*5.4 |
| DMF54C1995C30E | 1995.0 | 1.5 | ± 15 | 1.0 | 4.0 | 30dBc@3990 MHz; 30dB@2491.75 MHz | 13.0*9.0*5.4 |
| DMF54C2180C30A | 2185.0 | 1.0 | ± 15 | 1.0 | 5.0 | 30dBc@1980~2010 MHz 35dBc@ 1610~1626 MHz | 11.5*8.5*5.4 |
| DMF54C2185C30D2 | 2185.0 | 1.6 | ± 15 | 1.0 | 5.0 | 45dBc @ 1980~2010 MHz | 11.5*6.9*5.4 |
| DMF54C2185C30G | 2185.0 | 1.0 | ± 15 | 1.0 | 5.0 | 30dBc@1980~2010 MHz 35dBc@ 1610~1626 MHz | 11.5*8.5*5.4 |
| DMF54C2250C100D | 2250.0 | 1.5 | ± 50 | 1.0 | 10.0 | 40dBc@2025~2120 MHz(Full TEMP 20dB@3900 MHz | 11.5*8.5*5.4 |
| DMF54C2250C100H | 2250.0 | 1.5 | ± 50 | 1.0 | 10.0 | 30dBc@4500 MHz 30dB@2491.75 MHz | 13.0*8.0*5.4 |
| DMF56C1995C30A | 1995.0 | 1.5 | ± 15 | 1.0 | 5.0 | 60 dB @ 2170~2200 MHz | 22.0*9.1*5.9 |
| DMF84C2185C40A | 2185.0 | 2.0 | ± 20 | 0.8 | 8.0 | 45 dB @ 1975~2015 MHz | 16.0*8.1*8.5 |
| DMF86C1995C30A | 1995.0 | 1.0 | ± 15 | 1.0 | 20.0 | 50dBc@1570~1580 MHz 20dB@2090~2200 MHz | 25.4*9.2*8.5 |
| DMF86C1995C40A | 1995.0 | 1.0 | ± 20 | 0.3 | 8.0 | 60 dB @ 2165~2205 MHz | 19.0*8.5*8.1 |
| NBF456C2185C30A | 2185.0 | 3.0 | ± 15 | 1.5 | 2.0 | 50dBc@198~2010 MHz 50dB@2270~2295 MHz | 24.8*9.2*5.7 |
| Note: Due to many product models, only some representative models are listed in the table |
三、Application & attention
S-band dielectric filters are widely used in UAV, radar, T/R components, RF microwave, mobile communications and consumer electronics. 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. Note that the grounding end is well grounded, otherwise out-of-band suppression and flatness indicators will be affected. Do not use wave soldering during welding. If reflow welding is used, the recommended temperature is recommended. Do not soak when cleaning, it is recommended to wipe .
The S-band dielectric filter design is flexible and can be customized according to customer requirements. The company has a variety of sizes for users to choose from, can be customized from 2GHz - 4GHz S-band dielectric 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. This kind of product belongs to the relatively strong customization of the product, the product has been 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.
