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Kirt Blattenberger - RF Cafe WebmasterCopyright
1996 - 2016
Webmaster:
Kirt Blattenberger,
 BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...

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Bessel Filter Prototype Element Values

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 transitino 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 the equations here.

Prototype filter schematic - capacitor input - RF Cafe

Capacitor Input

Prototype filter schematic - inductor input - RF Cafe

Inductor Input

Order C1 L2 C3 L4 C5 L6 C7 L8 C9 L10
1 2.000                  
2 0.576 2.148                
3 0.3374 0.9705 2.2034              
4 0.2334 0.6725 1.0815 2.2404            
5 0.1743 0.5072 0.804 1.111 2.2582          
6 0.1365 0.4002 0.6392 0.8538 1.1126 2.2645        
7 0.1106 0.3259 0.5249 0.702 0.869 1.1052 2.2659      
8 0.0919 0.2719 0.4409 0.5936 0.7303 0.8695 1.0956 2.2656    
9 0.078 0.2313 0.377 0.5108 0.6306 0.7407 0.8639 1.0863 2.2649  
10 0.0672 0.1998 0.327 0.4454 0.5528 0.6493 0.742 0.8561 1.0781 2.2641
Order L1 C2 L3 C4 L5 C6 L7 C8 L9 C10
Related Pages on RF Cafe
- Filter Transfer Functions
- Filter Equivalent Noise Bandwidth
- Filter Prototype Denormalization
- Filter Design Resources
- 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