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Combline Cavity Bandpass Filters
Sirius Microwave's series of combline filters covers frequencies from 400MHz to 20GHz. These filters are available for bandwidths from 1% to 35% and with 3 to 20+ resonant sections. Combline design provides high "Q" and extremely small dimensions, saving 50% or more space comparing to conventinal cavity filters. Combline designs can provide stopbands that extend 3 to 10 times the center frequency. Contact factory for details here.
Features:
High "Q" Response
Low Insertion Loss
Small Package
3 dB Bandwidth from 1-35%
3 to 20+ sections

 

Specifications:
Model no.
Center Frequency [MHz]
1dB Bandwidth[MHz]
VSWR
Insertion Loss [dB]
Lower Stopband DC to [GHz]
Higher Stopband from [GHz]
Higher Stopband to [GHz]
Stopband attenuation [dB]
Power
FCL5-435-60
435
65
1.5 : 1
0.5
0.3
0.55
6
60
25
FCL6-445-9B
445
8.5
1.5 : 1
1.5
0.434
0.456
3.5
50
100
FCL5-480-3
480
6
1.5 : 1
3.0
0.46
0.5
3.0
70
50
FCL5-500-25
500
35
1.5 : 1
0.7
0.42
0.48
3.0
70
100
FCL5-740-50
740
50
1.5 : 1
0.5
0.64
0.83
4.4
50
25
FCL3-1000-20
1000
20
1.5 : 1
0.9
0.82
1.15
4
60
10
FCL9-1200-120
1200
120
1.5 : 1
0.6
1.07
1.33
7
70
25
FCL8-1300-200
1300
200
1.5 : 1
0.5
1.09
1.49
5.9
60
25
FCL8-1300-200B
1300
200
1.5 : 1
1.2
1.0
1.5
18
60
5
FCL8-1376-420
1376
420
1.5 : 1
0.5
0.75
1.85
8
50
5
FCL3-1385-15
1385
10
1.5 : 1
1.5
1.3
1.475
7
60
5
FCL5-1464-120
1464
120
1.5 : 1
0.4
1.2
1.7
7
50
25
FCL7-1500-200
1500
190
1.5 : 1
1.0
1.27
1.7
17
60
5
FCL4-1900-400
1900
360
1.5 : 1
0.5
0.8
2.6
10
50
10
FCL4-2339-12
2339
12
1.5 : 1
1.2
2.27
2.41
6.7
60
100
FCL4-2400-100
2400
130
1.5 : 1
0.5
1.8
2.8
10
60
10
FCL7-2400-400
2400
400
1.5 : 1
0.6
1.7
2.9
9
70
10
FCL11-2400-400
2400
392
1.5 : 1
0.7
2.1
2.7
12
60
25
FCL7-2650-300
2650
300
1.5 : 1
0.6
2.1
3.1
10
80
25
FCL9-2700-200
2700
200
1.5 : 1
1.0
2.4
2.9
10.5
70
10
FCL3-2856-30
2856
30
1.3 : 1
1.2
2.756
2.956
11
40
10
FCL5-3150-50
3150
50
1.3 : 1
1.6
3.05
3.25
18
50
10
FCL14-3150-500
3150
500
1.5 : 1
1.0
2.75
3.5
19
60
25
FCL6-3650-500
3650
550
1.5 : 1
0.4
2.6
4.4
15
60
10
FCL6-3950-500
3950
550
1.5 : 1
0.4
2.9
4.7
15
60
10
FCL12-5500-700
5000
700
1.5 : 1
1.0
4.95
5.99
19
60
10
FCL4-7830-100
7830
100
1.3 : 1
1.3
7.33
8.33
22
60
10
FCL5-8000-200
8000
175
1.5 : 1
1.6
7.6
8.4
24
60
5
FCL11-8900-800
8900
780
1.5 : 1
1.0
8.25
9.5
20
60
5
FCL6-9300-1000
9300
1000
1.5 : 1
0.7
7.7
10.7
26
60
5
FCL11-9700-800
9700
790
1.5 : 1
1.0
9.05
10.35
22
60
5
FCL7-10000-200
10000
200
1.5 : 1
1.3
9.9
10.1
22
40
5
FCL17-10500-3000
10500
2500
1.7 : 1
1.5
8.6
12.4
22
60
5
FCL6-11300-800
11300
800
1.5 : 1
1.1
10.1
12.4
38
60
5
FCL5-16500-800
16500
800
1.5 : 1
1.2
14.9
18.1
30
60
5

NOTE: Click on the model number to view a datasheet. You must have Adobe Acrobat Reader to view *.pdf files. Download Adobe Acrobat Reader here!

Attenuation

The adjacent curve is used to determine the out-of-band attenuation. This curve shows the attenuation as multiples of 3 dB bandwidth for filters up to 6 sections.

The formula for approximate out-of-band attenuation:

Model no. description:

FCL
6-
3650-
500
1
2
3
4
1-Filter Type, 2-Number of Sections, 3-Center Frequency (MHz), 4-Bandwidth (MHz)

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