Sirius Microwave’s series of combline cavity bandpass filters covers frequencies from 400MHz to 35GHz. 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 special requirements here.
Combline Cavity Bandpass Filters
Description
Features
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 | 0.29 | 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 |
| FCL4-1000-20B | 1000 | 20 | 1.5 : 1 | 1.3 | 0.95 | 1.05 | 10 | 50 | 25 |
| 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 |
| FCL4-1333-20 | 1333 | 18 | 1.3 : 1 | 0.8 | 1.25 | 1.4 | 6 | 70 | 25 |
| 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 |
| FCL8-1460-133 | 1460 | 133 | 1.5 : 1 | 0.5 | 1.29 | 1.575 | 4.5 | 50 | 10 |
| 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 |
| FCL5-1520-40B | 1520 | 40 | 1.3 : 1 | 0.8 | 1.455 | 1.5754 | 5.2 | 30 | 25 |
| FCL4-1595-10 | 1595 | 10 | 1.2 : 1 | 0.8 | 1.53 | 1.66 | 4.7 | 60 | 25 |
| FCL4-1900-400 | 1900 | 360 | 1.5 : 1 | 0.5 | 0.8 | 2.6 | 10 | 50 | 10 |
| FCL5-2000-30 | 2000 | 20 | 1.5 : 1 | 1.5 | 1.95 | 2.05 | 10 | 50 | 25 |
| FCL8-2075-20 | 2075 | 20 | 1.3 : 1 | 1.8 | 2.049 | 2.101 | 6.5 | 60 | 50 |
| FCL6-2150-400 | 2150 | 360 | 1.5 : 1 | 0.5 | 1.5 | 2.6 | 10 | 60 | 100 |
| FCL6-2187-140 | 2187 | 130 | 1.5 : 1 | 1.3 | 2.0 | 2.4 | 17.3 | 60 | 5 |
| FCL10-2187-255 | 2187 | 230 | 1.5 : 1 | 1.3 | 2.0 | 2.37 | 17.3 | 50 | 5 |
| FCL4-2339-12 | 2339 | 12 | 1.5 : 1 | 1.2 | 2.27 | 2.41 | 6.7 | 60 | 10 |
| 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 | 25 |
| FCL11-2400-400 | 2400 | 392 | 1.5 : 1 | 0.7 | 2.1 | 2.7 | 12 | 60 | 25 |
| FCL3-2500-14 | 2500 | 14 | 1.5 : 1 | 2.3 | 2.4 | 2.6 | 10 | 60 | 10 |
| FCL7-2650-300 | 2650 | 300 | 1.5 : 1 | 0.6 | 2.1 | 3.1 | 10 | 80 | 10 |
| FCL9-2700-200 | 2700 | 200 | 1.5 : 1 | 1.0 | 2.4 | 2.9 | 10.5 | 70 | 10 |
| FCL3-2750-15 | 2750 | 15 | 1.5 : 1 | 1.6 | 2.63 | 2.85 | 10 | 60 | 10 |
| FCL3-2856-30 | 2856 | 30 | 1.3 : 1 | 1.2 | 2.756 | 2.956 | 11 | 40 | 10 |
| FCL3-3000-18 | 3000 | 18 | 1.5 : 1 | 1.6 | 2.85 | 3.13 | 10 | 60 | 10 |
| FCL3-3000-20U | 3000 | 26 | 1.5 : 1 | 1.3 | 2.8 | 3.2 | 9 | 60 | 10 |
| FCL4-3040-20U | 3000 | 20 | 1.3 : 1 | 2.2 | 3.015 | 3.065 | 13 | 20 | 5 |
| FCL5-3150-50 | 3150 | 50 | 1.3 : 1 | 1.6 | 3.05 | 3.25 | 18 | 50 | 25 |
| FCL14-3150-500 | 3150 | 500 | 1.5 : 1 | 1.0 | 2.75 | 3.5 | 19 | 60 | 10 |
| FCL3-3250-20 | 3250 | 20 | 1.5 : 1 | 1.3 | 3.1 | 3.38 | 10 | 60 | 10 |
| FCL3-3500-22 | 3500 | 22 | 1.5 : 1 | 1.5 | 3.35 | 3.65 | 10 | 60 | 10 |
| FCL6-3650-500 | 3650 | 550 | 1.5 : 1 | 0.4 | 2.6 | 4.4 | 15 | 60 | 10 |
| FCL3-3750-26 | 3750 | 26 | 1.5 : 1 | 1.2 | 3.57 | 3.93 | 10 | 60 | 10 |
| FCL6-3950-500 | 3950 | 550 | 1.5 : 1 | 0.4 | 2.9 | 4.7 | 15 | 60 | 10 |
| FCL3-4000-28 | 4000 | 28 | 1.5 : 1 | 1.2 | 3.82 | 4.16 | 10 | 60 | 10 |
| FCL3-4250-30 | 4250 | 30 | 1.5 : 1 | 1.2 | 4.06 | 4.44 | 10 | 60 | 10 |
| FCL3-4500-32 | 4500 | 32 | 1.5 : 1 | 1.2 | 4.28 | 4.71 | 10 | 60 | 10 |
| FCL3-4750-33 | 4750 | 33 | 1.5 : 1 | 1.2 | 4.52 | 4.98 | 10 | 60 | 10 |
| FCL3-5000-38 | 5000 | 38 | 1.5 : 1 | 1.1 | 4.75 | 5.25 | 10 | 60 | 10 |
| FCL12-5500-700 | 5000 | 700 | 1.5 : 1 | 1.0 | 4.95 | 5.99 | 19 | 60 | 5 |
| FCL3-5537-800 | 5537 | 980 | 1.5 : 1 | 0.5 | 1.8 | 7.5 | 26 | 40 | 5 |
| FCL16-7000-2000 | 7000 | 1900 | 1.5 : 1 | 1.0 | 5.7 | 8.125 | 22 | 50 | 10 |
| FCL4-7830-100 | 7830 | 100 | 1.3 : 1 | 1.3 | 7.33 | 8.33 | 22 | 60 | 5 |
| FCL5-8000-200 | 8000 | 175 | 1.5 : 1 | 1.6 | 7.6 | 8.4 | 24 | 60 | 5 |
| FCL6-8650-1000 | 8650 | 1200 | 1.5 : 1 | 0.4 | 7.0 | 9.9 | 24.5 | 50 | 10 |
| FCL6-8750-500 | 8750 | 530 | 1.5 : 1 | 1.0 | 8.0 | 9.5 | 24.5 | 50 | 10 |
| 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 |
| FCL3-9400-800 | 9400 | 1000 | 1.5 : 1 | 0.4 | 6.8 | 11.2 | 26.5 | 30 | 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 |
| FCL3-10000-40 | 10000 | 40 | 1.5 : 1 | 2.0 | 9.85 | 10.15 | 22 | 40 | 5 |
| FCL17-10500-3000 | 10500 | 2500 | 1.7 : 1 | 1.5 | 8.6 | 12.4 | 22 | 60 | 5 |
| FCL6-11300-800 | 11300 | 750 | 1.5 : 1 | 1.1 | 10.1 | 12.4 | 38 | 60 | 5 |
| FCL11-12363-575 | 12363 | 560 | 1.5 : 1 | 2.0 | 11.94 | 12.8 | 35 | 40 | 5 |
| FCL14-15720-950 | 15720 | 850 | 1.5 : 1 | 2.0 | 15.14 | 16.4 | 39 | 40 | 5 |
| FCL5-16500-800 | 16500 | 800 | 1.5 : 1 | 1.2 | 14.9 | 18.1 | 30 | 60 | 5 |
| FCL9-19000-2000 | 19000 | 2400 | 1.5 : 1 | 1.2 | 17 | 21.5 | 40 | 50 | 5 |
| FCL6-34500-4000 | 34500 | 5000 | 1.5 : 1 | 1.5 | 28 | 40 | 50 | 50 | 5 |
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:
