一、Characteristics

     The working principle of dielectric filter bandpass (also known as ceramic bandpass filter) is based on the resonance effect and frequency selectivity of the material, when the frequency of the input signal is close to the resonant frequency of the filter, the response of the filter will be enhanced, so that the signal in the frequency range is passed; When the frequency deviates from the resonant frequency, the response of the filter will be relatively reduced, and unwanted low and high frequency signals can be filtered out. The main function of the bandpass is to allow signals in a specific frequency range to pass, while suppressing signals above and below the frequency norm, so as to control signals in other frequency ranges. The media/ceramic bandpass filter has bandwidth control capability.

     Dielectric/ceramic bandpass 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/ceramic bandpass filter

二、产品型号及参数

Dielectric bandpass filter (ceramic bandpass filter) model and parameter table
Part No	Center Frequency (MHz)	Insertion loss(dBMax )	BW (MHz)	Ripple(dBMax)	V.S.W.R(Max)	Size(mm)	SPEC
DFC490B40AF	490	2.0	±20	1.0	2.0:1	7.45*3.7*9.9
DFN1232S136FA	1232	1.0	±68	0.5	1.4:1	16.2*5.4*9.9
DFN1232S136EA	1232	1.3	±68	1.0	1.5:1	11*4.05*10.4
DFC1268P24A4	1268	0.55	±12	0.1	1.4:1	7.4*3.65*5.5
DFN1576S95EA	1567.5	1.6	±47.5	1.0	1.5:1	10.8*4.05*8.9
DFC1575P50A8	1575.42	1.0	±25	0.5	2.0:1	7.5*3.8*7.4
DFN1585R58EB	1585	0.65	±29	0.5	1.5:1	8.5*4.5*8.0
DFN1580P80EA	1585	0.7	±40	0.5	1.5:1	7.4*4.1*8.5
DFN1587S56EA	1587	1.6	±28	1.0	1.5:1	10.8*4.2*8.6
DFN1587R56EA	1587	0.8	±28	0.4	1.5:1	9.2*4.25*8.4
DFN1817W25FC	1817.5	3.0	±12.5	1.2	1.42:1	17.5*4.8*9.0
DFN817W25FB	1817.5	1.5	±12.5	1.0	1.42:1	17.5*4.8*9.0
DFN1855W50FA	1855	1.7	±25	0.5	1.29:1	17.5*4.8*9.0
DFC2492P40A14	2492	0.6	±20	0.5	1.5:1	7.4*3.7*6.2
DFM2595X160HA	2595	2.6	±80	1.5	1.42:1	29.5*9.0*8.0
DFN2595X160FC	2595	2.5	±80	1.5	1.42:1	17.5*4.8*6.9
DFM2595W160GG	2595	2.5	±80.0	1.5	1.5:1	22.5*7.0*10.5
DFN2595W160EA	2595	2.5	±80.0	1.5	1.5:1	16.4*4.5*6.7
DFN2595S160DA	2595	2.5	±80.0	2.0	1.5:1	8.6*3.3*6.7
DFM2595Z160IA	2595	2.9	±80.0	2.0	1.5:1	61.0*11.0*15
DFM3350W100FA	3350	2.0	±50	1.5	1.38:1	22.5*7.0*8.0
DFM3450W100FA	3450	2.0	±50	1.5	1.38:1	22.5*7.0*8.0
DFM3450W300GC	3450	2.0	±150.0	1.2	1.5:1	22.5*7.0*8.0
DFM3450W100GB	3450	2.5	±50.0	1.5	1.5:1	22.5*7.0*8.0
DFM3465W90GA	3465	2.5	±45	1.3	1.67:1	22.5*7.0*8.0
DFM3470W100GA	3470	2.5	±50	1.3	1.5:1	22.5*7.0*8.0
DFN3475W350GA	3475	2.0	±175	1.3	1.52:1	22.5*6.0*6.1
DFN3500W200ED	3500	2.0	±100	1.0	1.92:1	16.4*4.5*6.2
DFM3500W100FA	3550	2.0	±50	1.5	1.38:1	22.5*6.0*8.0
DFM3550W500GC	3550	2.2	±250.0	1.5	1.5:1	22.5*7.0*8.0
DFM3625W150GB	3625	2.4	±75	1.5	1.5:1	22.5*7.0*8.0
DFM3650S500DA	3650	2.0	±250.0	1.0	1.6:1	8.6*3.8*10
DFM3650W300GA	3650	2.3	±150.0	1.0	1.6:1	24.5*6.4*12
DFM3750W100GD	3750	2.3	± 50	1.5	1.5:1	22.5*7.0*8.0
DFM4650W500GB	4650	2.5	±250.0	1.5	1.5:1	22.5*7.0*8.0
DFM4700W200GA	4700	2.7	±100	1.5	1.5:1	22.5*7.0*8.0
DFM4700W600GB	4700	2.5	±300	1.5	142:1	22.5*7.0*8.0
DFM4850W100GE	4850	2.8	±50	1.3	1.5:1	22.5*7.0*8.0
DFM4850W100GB	4850	2.5	±50	1.5	1.5:1	22.5*7.0*8.0
DFM4850W100GA	4850	3.2	±50	1.5	1.5:1	22.5*5.1*6.2
DFN4880W160FA	4880	3.5	±80.0	1.5	1.5:1	17.5*4.8*5.0
DFM4930W60GA	4930	3.2	±30.0	1.5	1.5:1	22.5*7.0*8.0
DFN5442Y585CA	5442.5	3.0	±292.5	2.5	1.42:1	9.35*2.2*4.5
DFN5492C685EC	5492.5	3.0	±342.5	1.5	2.0:1	12.8*3.8*4.4
DFN6630Y1050CA	6630	3.0	±525	2.5	1.43:1	9.35*2.2*3.9
Note: Due to many product models, only some representative models are listed in the table

三、Application & attention

    Ceramic bandpass filters are widely used in base stations, routers, UAVs, radars, T/R components, RF microwave, Wi-Fi, repeater, mobile communications and electronic products with bandwidth control capabilities. In use, pay attention to the grounding end is well grounded, otherwise it will affect the out-of-band suppression and flatness indicators, the welding temperature can not be too high, the time can 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 ceramic bandpass filter design is flexible and can be customized according to customer requirements. The company has a variety of sizes of ceramic low-pass filter (dielectric low-pass filter) for users to choose from, can be customized from 300MHz to 10GHz ceramic bandpass filter, ceramic high-pass filter, ceramic low-pass filter, ceramic 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.