note:the real insertion loss is expected to be better than this formula 。
1.Loss constant:
Central frequency(MHz) |
2
159 |
160
199 |
200
299 |
300
399 |
400
499 |
500
599 |
600
699 |
700
799 |
800
899 |
900
999 |
1000
6000 |
Loss constant |
8.8 |
7.8 |
6.8 |
5.7 |
4.9 |
4.4 |
4.0 |
3.7 |
3.5 |
3.25 |
3.0 |
一. PN rules:
The PN of LC filters consists of performance parameters and package. The standard input/output lead is φ0.5 or φ0.8 signal probe. In case of SMA, it’s required to be marked following the package.
Note1:
1.In addition to the parameters, customer also can offer PN according to our rules when placing orders。
2.The old PN is also effective.
LC bandpass filters
FB×××— ××/ ×— × ×× ××
1 2 3 4 5 6
Interpretation: FB— bandpass filter
1—central frequency f0,taking MHz for unit
2—passband BW,taking MHz for unit
3—bandwidth feature T—3Db BW
O—1dB BW
H—0.5dB BW
F—0.2Db flat BW
P—Dot frequency
4— numbers of section
5—package :P:radial pin
C:axial probe
I:parallel(II) probe
L:right angle(L) probe(L)
D:DiP dual-in-line integrate circuit pin
S:SMT
6—package SN
LC lowpass filter
FL×××/×-×××-×× ××
1 2 3 4 5
Interpretation:FL—lowpass filter
1—Cutoff frequency, MHz for unit
2—Cutoff frequency features
T—3dB BW
O—1dB BW
3—frequency at the suppression point,
taking MHz for unit
4/5—package series
LC highpass filter
FH×××/× ×××—×× ××
1 2 3 4 5
Interpretation:FH—highpass filter
1—cutoff frequency fC,taking MHz for unit
2—cutoff frequency features
T—3dB BW
O—1dB BW
3—frequency at the suppression point,
taking MHz for unit
4/5—package series
LC Notch Filter
FR×××-×××/×× -×× ××
1 2 3 4 5
Interpretation:FR—band-reject filter
1—central frequency, taking MHz for unit
2—bandwidth of reject band, taking MHz for unit
3—suppression of reject band, taking dBc for uni
4、5—package series
LC Duplexer
FDS-×/× -× ××—×× ××
1 2 3 4 5
Interpretation:FDS—combining filter
1—CH1 central frequency, taking MHz for unit
2—CH2 central frequency, taking MHz for unit
3— frequency feature: B for bandpass filter
P for dot frequency filter
4— bandwidth of pass band (only for bandpass filter
5— package series