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Home : Products : LC Filters : Low Pass LC Filters

Low Pass LC Filters:

A lowpass filter provides good transmission at frequencies below the cut-off frequency (Fc) and suppresses transmission at higher frequencies. An abrupt change from the “pass” to “stop” condition is not feasible in real filters. Therefore, a reasonable “guardband” is provided by specifying a stopband frequency Fr where a specific level of rejection Ar is to be achieved and maintained.

More lowpass filters are used than any other type for suppression of harmonic pf spurious outputs from transmitters or other RF signals. Lowpass filters are also used for protection of sensitive receiving equipment from strong signals at higher frequencies.

Lowpass filters can be supplied as lumped, semi-lumped constant construction or distributed elements construction depending on frequency. Good passband quality may be defined as low reflection, low insertion loss and flat time delay. In genera, increasing selectivity results in decreasing passband.


OPT
Model

Freq.

 

PassBand
Freq.

I.L.

Ripple
max

Rejection Band

Zin
Zout

(Ω)

VSWR

Power

Temperat.
Range
C

    Package
LxWxH
mm

MHz

MHz

dB

dB

db

MHz

W

LP9860*

4.200

.200to4.20

0.5

0.5

37

5.50to10.0

75

20 db

 

0 / + 50

47.3X28X12.71

LP4213*

43.000

61.500

88.000

30.0to43.0

43.0to61.5

61.5to88.0

0.6

0.6

0.6

0.6

0.6

0.6

47

47

47

60

86

123

50

50

50

16.5dB

16.5dB

16.5 db

70

70

70

-55/ +100

-55/ +100

-55/ +100

78.2X63.5X18.8

LP4214

43.000

30.0to43.0

0.6

0.6

50

60 to 800

50

1.35:1

8

-55/ +100

28X9.2X10.4

LP4215

61.500

61.5to88.0

0.6

0.6

50

86 to 800

50

1.35:1

8

-55/ +100

28X9.2X10.4

LP4216

88.000

DC to 174

0.6

0.6

50

123 to 800

50

1.35:1

8

-55/ +100

28X9.2X10.4

LP9568

174.000

100 to 174

0.1

0.2

60

@ 320 to 500

50

1.4:1

 

-20/  +60

81X21X30

LP9573

174.000

5,000

0.5

0.5

30

@ 200 to 225

50

1.4:1

200

-50/ +100

134X25X25SMA

LP9574

225.000

174 to 225

0.5

0.5

50

@ 348 to 390

50

1.4:1

200

-50/ +100

134X25X25SMA

LP9575

4000.000

225 to 500

0.5

0.5

30

@ 450 to 500

50

1.4:1

200

-50/ +100

134X25X25SMA

LP9576

470.000

400 to 470

0.5

0.5

50

@ 800 to 900

50

1.4:1

200

-50/ +100

134X25X25SMA



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OPT Hellas SA, 101, Kon. Paleologou Str., GR-190 04, Spata, Athens, Greece Tel: +30-210-6025072 , Fax:+30-210-6025534

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