4th Order Absorptive Bessel Low Pass Filters
RLC Electronics’ 4th Order Absorptive Bessel Filters provide the excellent group delay response of Bessel filters while maintaining impedance matching far into the stop band. Resistive elements are designed into these filters, resulting in a response that closely mimics the classic Bessel in both amplitude and phase. These filters are used in digital systems where truthful reproduction of waveforms is important. These filters are now available with -3dB cut off frequencies as high as 10 GHz. A surface mount configuration in available to 4 GHz.
Specifications
LBA–1–2
Model No. |
-3 dB Cut-off Frequency (MHz) |
f/fc |
Nominal Attenuation (dB) |
Attenuation Accuracy (dB) Cut-off < 4 GHz |
Attenuation Accuracy (dB) Cut-off > 4 GHz |
LBA- |
10 to 10,000* |
0.2 |
-0.1 |
.2 |
.2 |
0.4 |
-0.4 |
.2 |
.25 |
||
0.6 |
-1.0 |
.2 |
.25 |
||
0.8 |
-1.9 |
.2 |
.3 |
||
1.0 |
-3.0 |
.2 |
.3 |
||
1.2 |
-4.5 |
.48 |
.55 |
||
1.33 |
-5.7 |
.59 |
.75 |
||
1.4 |
-6.4 |
.64 |
.85 |
||
1.6 |
-8.5 |
.74 |
1.00 |
||
1.8 |
-10.9 |
.89 |
1.2 |
||
2.0 |
-13.4 |
1.00 |
1.6 |
||
2.67 |
-21.5 |
N/A |
N/A |
To designate the filter desired use:
(1): 3dB cut-off frequency in MHz |
(2): “S” for surface mount |
*surface mount configuration to 4Ghz max
Impedance: 50 ohms VSWR: 1.5:1 to 2X 3dB cut-off or 8GHz (Whichever is less for cut-off < 4,000 MHz) 1.65:1 to 2X 3dB cut-off or 18 GHz (Whichever is less for cut-off > 4,000 MHz) |
Connector Type: SMA female / male Temperature: 55C to +85C Environment: MIL-E-5400, Class 1A Power Rating: 0.5 watts average |
Outline Drawing
