Lowpass Filters (above)
Highpass Filters (above)
Bandpass and Bandstop Filters (above)
A Bessel filter is a filter whose impulse response is a Bessel function. Bessel filters
are designed to give maximally flat group delay and maximally linear phase change across
the band and into the transition region. They are very close to Gaussian type filters.
The table below lists prototype element values for the normalized lowpass function,
which assumes a cutoff frequency of 1 rad/sec and source and load impedances of 1 Ω.
Either an input capacitor (top reference line in table) or an input inductor (bottom
line in table) can be used.
Convert values to other cutoff frequencies, impedances, and to highpass, bandpass
or bandstop using denormalization equations.
 Capacitor Input
|
Inductor Input
|
| |
| 2.000 |
|
|
|
|
|
|
|
|
|
| 0.576 |
2.148 |
|
|
|
|
|
|
|
|
| 0.3374 |
0.9705 |
2.2034 |
|
|
|
|
|
|
|
| 0.2334 |
0.6725 |
1.0815 |
2.2404 |
|
|
|
|
|
|
| 0.1743 |
0.5072 |
0.804 |
1.111 |
2.2582 |
|
|
|
|
|
| 0.1365 |
0.4002 |
0.6392 |
0.8538 |
1.1126 |
2.2645 |
|
|
|
|
| 0.1106 |
0.3259 |
0.5249 |
0.702 |
0.869 |
1.1052 |
2.2659 |
|
|
|
| 0.0919 |
0.2719 |
0.4409 |
0.5936 |
0.7303 |
0.8695 |
1.0956 |
2.2656 |
|
|
| 0.078 |
0.2313 |
0.377 |
0.5108 |
0.6306 |
0.7407 |
0.8639 |
1.0863 |
2.2649 |
|
| 0.0672 |
0.1998 |
0.327 |
0.4454 |
0.5528 |
0.6493 |
0.742 |
0.8561 |
1.0781 |
2.2641 |
| |
Related Pages on RF Cafe
-
Butterworth Filter Equations for Magnitude, Phase, and Group Delay
-
Chebyshev Filter Equations for Magnitude, Phase, and Group Delay
-
Butterworth Lowpass Filter Gain, Phase, and Group Delay Equations
-
Butterworth Highpass, Bandpass, & Bandstop Filter Gain, Phase, and Group Delay
Equations
- How to
Use Filter Equations in a Spreadsheet
- Filter Transfer Functions
- Filter Equivalent Noise
Bandwidth
- Filter Prototype Denormalization
- Bessel Filter Poles
- Bessel Filter
Prototype Element Values
- Butterworth Lowpass
Filter Poles
- Butterworth Filter
Prototype Element Values
- Chebyshev Lowpass Filter
Poles
- Chebyshev Filter
Prototype Element Values
- Monolithic
Ceramic Block Combline Bandpass Filters Design
-
Coupled Microstrip Filters: Simple Methodologies for Improved Characteristics
|
